User manual | Ametek / Elgar / Sorensen MML Series Manual

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SORENSEN ONE-YEAR WARRANTY
Sorensen, a division of Elgar Electronics Corporation, warrants its products to be free from defects in
material and workmanship. This warranty is effective for one year from the date of shipment of the product to
the original purchaser. Liability of Sorensen under this warranty shall exist provided that:
•
the Buyer exposes the product to normal use and service and provides normal maintenance on the
product;
•
Sorensen is promptly notified of defects by the Buyer and that notification occurs within the warranty period;
•
the Buyer receives a Return Material Authorization (RMA) number from Sorensen’s Repair Department
prior to the return of the product to Sorensen for repair, phone 800-733-5427;
•
the Buyer returns the defective product in the original, or equivalent, shipping container;
•
if, upon examination of such product by Sorensen it is disclosed that, in fact, a defect in materials and/or
workmanship does exist, that the defect in the product was not caused by improper conditions, misuse,
or negligence; and,
•
that Sorensen QA seal and nameplates have not been altered or removed and the equipment has not been
repaired or modified by anyone other than Sorensen authorized personnel.
This warranty is exclusive and in lieu of all other warranties, expressed or implied, including, but not limited
to, implied warranties of merchantability and fitness of the product to a particular purpose. Sorensen, its
agents, or representatives shall in no circumstance be liable for any direct, indirect, special, penal, or
consequential loss or damage of any nature resulting from the malfunction of the product. Remedies under
this warranty are expressly limited to repair or replacement of the product.
CONDITIONS OF WARRANTY
•
To return a defective product, contact a Sorensen representative or the Sorensen factory for an RMA
number. Unauthorized returns will not be accepted and will be returned at the shipper’s expense.
•
For Sorensen products found to be defective within thirty days of receipt by the original purchaser,
Sorensen will absorb all ground freight charges for the repair. Products found defective within the warranty
period, but beyond the initial thirty-day period, should be returned prepaid to Sorensen for repair. Sorensen
will repair the unit and return it by ground freight pre-paid.
•
Normal warranty service is performed at Sorensen during the weekday hours of 7:30 am to 4:30 pm Pacific
time. Warranty repair work requested to be accomplished outside of normal working hours will be subject to
Sorensen non-warranty service rates.
•
Warranty field service is available on an emergency basis. Travel expenses (travel time, per diem expense,
and related air fare) are the responsibility of the Buyer. A Buyer purchase order is required by Sorensen
prior to scheduling.
•
A returned product found, upon inspection by Sorensen, to be in specification is subject to an inspection fee
and applicable freight charges.
•
Equipment purchased in the United States carries only a United States warranty for which repair must be
accomplished at the Sorensen factory.
Committed to Quality...Striving for Excellence
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SAFETY NOTICE
Before applying power to the system, verify that the MML Series unit is configured properly for the user’s
particular application.
WARNING!
HAZARDOUS VOLTAGES IN EXCESS OF 280 VRMS, 600V PEAK MAY BE
PRESENT WHEN COVERS ARE REMOVED. QUALIFIED PERSONNEL MUST
USE EXTREME CAUTION WHEN SERVICING THIS EQUIPMENT. CIRCUIT
BOARDS, TEST POINTS, AND OUTPUT VOLTAGES MAY BE FLOATING
ABOVE (BELOW) CHASSIS GROUND.
Installation and service must be performed by qualified personnel who are aware of dealing with attendant
hazards. This includes such simple tasks as fuse verification.
Ensure that the AC power line ground is connected properly to the MML Series unit input connector
or chassis. Similarly, other power ground lines including those to application and maintenance
equipment must be grounded properly for both personnel and equipment safety.
Always ensure that facility AC input power is de-energized prior to connecting or disconnecting the
input/output power cables.
During normal operation, the operator does not have access to hazardous voltages within
the chassis. However, depending on the user’s application configuration, HIGH VOLTAGES
HAZARDOUS TO HUMAN SAFETY may be generated normally on the output terminals.
Ensure that the output power lines are labeled properly as to the safety hazards and that any
inadvertent contact with hazardous voltages is eliminated. To guard against risk of electrical
shock during open cover checks, do not touch any portion of the electrical circuits. Even when the power
is off, capacitors can retain an electrical charge. Use safety glasses during open cover checks to avoid
personal injury by any sudden failure of a component.
Due to filtering, the unit has high leakage current to the chassis. Therefore, it is essential to operate this unit
with a safety ground.
Some circuits are live even with the front panel switch turned off. Service, fuse verification, and
connection of wiring to the chassis must be accomplished at least five minutes after power has been
removed via external means; all circuits and/or terminals to be touched must be safety grounded to
the chassis.
After the unit has been operating for some time, the metal near the rear of the unit may be hot enough to
cause injury. Let the unit cool before handling.
Qualified service personnel need to be aware that some heat sinks are not at ground, but at high potential.
These operating instructions form an integral part of the equipment and must be available to the operating
personnel at all times. All the safety instructions and advice notes are to be followed.
Neither Sorensen, San Diego, California, USA, nor any of the subsidiary sales organizations, can accept any
responsibility for personal, material or consequential injury, loss, or damage that results from improper use of
the equipment and accessories.
iii
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SAFETY SYMBOLS
CAUTION
Risk of Electrical Shock
Protective Conductor Terminal
Direct Current (DC)
CAUTION
Refer to Accompanying Documents
Off (Supply)
Alternating Current (AC)
Three–Phase Alternating Current
Standby (Supply)
Fuse
On (Supply)
Earth (Ground) Terminal
iv
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CONTENTS
1. GENERAL INFORMATION
1.1
1.2
1.3
1.4
Introduction .................................................................................................. 1-1
Description................................................................................................... 1-1
Overview of Key Features............................................................................ 1-1
Specifications............................................................................................... 1-2
2. INSTALLATION
2.1
2.2
2.3
2.4
2.5
2.6
Introduction .................................................................................................. 2-1
Inspection .................................................................................................... 2-1
Installing the Modules .................................................................................. 2-1
2.3.1 Channel Number .............................................................................. 2-2
Installing the Mainframe............................................................................... 2-3
2.4.1 Changing Line Voltage..................................................................... 2-3
2.4.2 Turn-On Self-Test ............................................................................ 2-4
Application Connection ................................................................................ 2-5
2.5.1 Load Connections ............................................................................ 2-5
2.5.2 Remote Sensing Connections.......................................................... 2-6
2.5.3 Parallel Connections ........................................................................ 2-7
Remote Control Connection......................................................................... 2-7
3. OPERATION OVERVIEW
3.1
3.2
3.3
3.4
3.5
Introduction .................................................................................................. 3-1
Front Panel Description ............................................................................... 3-1
Rear Panel Description ................................................................................ 3-2
Local/Remote Control .................................................................................. 3-2
Modes of Operation ..................................................................................... 3-3
3.5.1 Constant Current Mode.................................................................... 3-3
3.5.2 Constant Resistance Mode .............................................................. 3-6
3.5.3 Constant Voltage Mode.................................................................... 3-7
3.6 Load Synchronization .................................................................................. 3-8
3.7 Measurements ............................................................................................. 3-8
3.8 Slew Rate and Minimum Transient Time ..................................................... 3-8
3.9 Start/Stop Sink Current ................................................................................ 3-8
3.10 Short On/Off............................................................................................... 3-10
3.11 Load On/Off ............................................................................................... 3-10
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Sorensen MML Series Operation and Programming Manual
3.12 Protection Features ....................................................................................3-10
3.13 Save/Recall Setting ....................................................................................3-12
3.14 Program......................................................................................................3-12
4. LOCAL OPERATION
4.1
4.2
4.3
Introduction...................................................................................................4-1
Local Operation of Load Mainframe .............................................................4-1
4.1.1
Selecting the Channel ....................................................................4-3
4.1.2
Setting the Operation Mode............................................................4-3
4.1.3
Setting the Program........................................................................4-7
4.1.4
Running the Program ...................................................................4-10
4.1.5
Setting the Specifications .............................................................4-10
4.1.6
Setting the Configuration ..............................................................4-11
4.1.7
Recalling Files ..............................................................................4-15
4.1.8
Saving Files ..................................................................................4-15
4.1.9
Saving Defaults ............................................................................4-16
4.1.10 Saving Programs ..........................................................................4-16
4.1.11 Going To Local .............................................................................4-16
4.1.12 Lock Operation .............................................................................4-16
4.1.13 Setting System and RS-232C Connection....................................4-16
4.1.14 Connecting the GO/NG Output Port .............................................4-17
4.1.15 Setting the GPIB Address.............................................................4-17
Local Operation of Load Module ................................................................4-18
4.3.1
Local Operation of Single Channel/Module (Panel A) ..................4-18
4.1.2
Local Operation of Double Channels/Module (Panel B) ...............4-21
4.1.3
Online Change Level ....................................................................4-24
5. REMOTE OPERATION
5.1
5.2
5.3
5.4
5.5
5.6
5.7
Introduction...................................................................................................5-1
DIP Switches on the GPIB Card...................................................................5-1
5.2.1 GPIB Address...................................................................................5-1
5.2.2 Other DIP Switches ..........................................................................5-2
GPIB Capability of the Electronic Load.........................................................5-3
RS232C in Remote Control ..........................................................................5-3
Basic Programming Definitions ....................................................................5-4
Numerical Data Formats...............................................................................5-5
Character Data Formats ...............................................................................5-6
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Contents
5.8
5.9
Separators and Terminators ........................................................................ 5-6
Language Dictionary .................................................................................... 5-8
5.9.1 Common Commands ....................................................................... 5-8
5.10 Specific Commands ................................................................................... 5-13
5.10.1 ABORT Subsystem...................................................................... 5-13
5.10.2 CHANNEL Subsystem ................................................................. 5-13
5.10.3 CONFIGURE Subsystem............................................................. 5-16
5.10.4 CURRENT Subsystem................................................................. 5-21
5.10.5 FETCH Subsystem ...................................................................... 5-25
5.10.6 LOAD Subsystem ........................................................................ 5-27
5.10.7 MEASURE Subsystem ................................................................ 5-29
5.10.8 MODE Subsystem ....................................................................... 5-32
5.10.9 PROGRAM Subsystem................................................................ 5-33
5.10.10 RESISTANCE Subsystem ........................................................... 5-37
5.10.11 RUN Subsystem .......................................................................... 5-39
5.10.12 SHOW Subsystem ....................................................................... 5-39
5.10.13 SPECIFICATION Subsystem....................................................... 5-40
5.10.14 STATUS Subsystem .................................................................... 5-43
5.10.15 VOLTAGE Subsystem ................................................................. 5-48
5.11 Status Reporting ........................................................................................ 5-50
5.11.1 Introduction .................................................................................. 5-50
5.11.2 Register Information in Common ................................................. 5-50
5.11.3 Channel Status ............................................................................ 5-52
5.11.4 Channel Summary ....................................................................... 5-53
5.11.5 Questionable Status..................................................................... 5-53
5.11.6 Output Queue .............................................................................. 5-54
5.11.7 Standard Event Status ................................................................. 5-54
5.11.8 Status Byte Register .................................................................... 5-55
5.11.9 Service Request Enable Register ................................................ 5-55
6. PROGRAMMING EXAMPLE
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1 GENERAL INFORMATION
1.1
Introduction
This manual contains specifications, installation, operation, and programming
instructions of MML-4, MML-2 electronic load mainframes as well as the
MML-80-20-102 and MML-80-60-301 electronic load modules. Here “Load” means the
electronic load modules of Sorensen MML series while “Mainframe” the MML-4, MML-2
electronic load mainframes.
1.2
Description
The functions of MML-4 and MML-2 mainframes are the same. The former has four
slots for Load modules while the latter two slots. The functions of MML-80-20-102,
MML-80-60-301, etc. are all the same. The differences are in input voltage, load
current, and power ratings. An individual module may have one or two channels.
Each channel has its own channel number, load and measurement connectors, and
operates independently in constant current (CC) mode, constant resistance (CR) mode,
or constant voltage (CV) mode.
Figure 1-1 Front Panel of the Electronic Load
There are two groups of keypads on the front panel of the electronic load (see Figure
1-1). One is the Mainframe keypad; the other is the Load keypad. In this manual, the
Mainframe keypad is referred to as MODE; the Load keypad is referred to as SHORT.
1.3
Overview of Key Features
1.3.1
•
•
•
•
Configuration
Flexible configuration using plug-in electronic load modules to mainframes.
Local operation on front panel keypad.
Remote control via GPIB or RS-232C interface.
Photocoupler isolation to offer true floating Load.
1-1
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Sorensen MML Series Operation and Programming Manual
•
•
1.3.2
•
•
•
•
•
•
•
•
•
•
•
•
1.4
Automatic fan speed control to reduce noise.
Up to 8 channels for one Mainframe.
Load
Constant current (CC), constant resistance (CR), and constant voltage (CV)
operation modes.
Programmable slew rate, load levels, load periods, and conduct voltage (Von).
Programmable dynamic loading with speed up to 20KHz.
Minimum input resistance allowing load to sink high current even with low input
voltage (1 V).
Selective voltage and current ranges.
Remote sensing capability.
100 sets of memories to save/recall user-definable setups.
10 sets of programs to link files for automatic test.
15-bit A/D converter with precision measurement.
Short circuit simulation.
Automatic GO/NG inspection to confirm UUT within spec.
Independent GO/NG signals for each channel.
Specifications
Mainframe:
AC input:
Fuse:
Amplitude:
Frequency:
Maximum VA:
Trigger output:
MML-4
115/230 switchable or 100/200 switchable Vac line
5A/250V
±10%
47 to 63 Hz
180VA
Vlo = 0.8V maximum at Ilo = 1 mA
Vhi = 3.2V minimum at Ihi = −40µA
Weight:
24Kg
Dimensions:
Width: 440mm
Height: 177.4 mm (excluding feet), 186mm (including feet)
Depth: 560mm (including Load module)
 Load specifications are listed in the tables below.
1.
2.
3.
4.
5.
NOTES
All specifications are tested at 20°C ∼ 30°C except otherwise stated.
The range of operation temperature is 0°C ∼ 40°C.
The specifications of DC current accuracy are tested after the input is applied for 30
seconds.
The power of the load module of MML series is supplied from MML-4/MML-2
mainframe.
The typical temperature coefficient is 100ppm.
1-2
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General Information
MODEL MML-80-20-102(100W*2)
POWER
CURRENT
VOLTAGE
MINIMUM OPERATING VOLTAGE
(DC)
CONSTANT CURRENT MODE
Range
Resolution
Accuracy
CONSTANT RESISTANCE MODE
Range
Resolution
Accuracy
CONSTANT VOLTAGE MODE
Range
Resolution
Accuracy
20W
0∼2A
100W
0∼20A
1∼80V
1.0V at 2A
1.0V at 20A
0∼2A
0∼20A
0.5mA
5mA
0.1%+0.1%F.S. 0.1%+0.2%F.S.
CRL: (0.075Ω∼300Ω) (100W/16V)
CRH: (3.75Ω∼15KΩ) (100W/80V)
12 bits
CRL: 0.1mho+0.2%
CRH: 0.01mho+0.1%
1∼80V
20mV
0.05%+0.1%F.S.
DYNAMIC MODE
DYNAMIC MODE
T1 and T2
Accuracy
Slew Rate
Resolution
Current
Resolution
Current Accuracy
C.C. MODE
0.025mS∼10mS / Res: 1µS
1mS∼30S / Res: 1mS
1µS /1mS+100ppm
0.32∼80mA/µS
3.2∼800mA/µS
0.32mA/µS
3.2mA/µS
0∼2A
0∼20A
0.5mA
5mA
0.4% F.S.
MEASUREMENT SECTION
VOLTAGE READ BACK
Range
Resolution
Accuracy
0∼16V
0∼80V
0.5mV
2.5mV
0.05%+0.05% F.S.
CURRENT READ BACK
Range
Resolution
Accuracy
0∼2A
0∼20A
0.0625mA
0.625mA
± (0.1%+0.1% F.S.)
PROTECTIVE SECTION
Over Power Protection
≒ 20.8W
≒ 104W
Over Current Protection
≒ 2.04A
≒ 20.4A
Over Temperature Protection
Over Voltage Protection
≒ 85°C
≒ 81.6V/16.3V
GENERAL
SHORT CIRCUIT
Current (CC)
Voltage (CV)
Resistance (CR)
INPUT RESISTANCE (LOAD OFF)
SIZE
WEIGHT (Approx.)
EMC and SAFETY
≒ 2.2/2A
0V
≒ 22/20A
0V
≒ 3.75Ω
≒ 0.075Ω
100KΩ (Typical)
81(W)× 172(H)×495(D)
4.2Kg
CE
1-3
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Sorensen MML Series Operation and Programming Manual
MODEL MML-80-60-301
POWER
CURRENT
VOLTAGE
MINIMUM OPERATING VOLTAGE (DC)
CONSTANT CURRENT MODE Range
Resolution
Accuracy
CONSTANT RESISTANCE MODE
Range
Resolution
Accuracy
CONSTANT VOLTAGE MODE Range
Resolution
Accuracy
30W
0∼6A
300W
0∼60A
1∼80V
1.0V at 6A
1.0V at 60A
0∼6A
0∼60A
1.5mA
15mA
0.1%+0.1%F.S. 0.1%+0.2%F.S.
0.025Ω∼100Ω (300W/16V)
1.25Ω∼5KΩ (300W/80V)
12 bits
CRL (100Ω): 0.1mho+0.2%
CRH (5KΩ): 0.01mho+0.1%
2.5∼500V
20mV
0.05%+0.1%F.S.
DYNAMIC MODE
DYNAMIC MODE
T1 and T2
Accuracy
Slew Rate
Resolution
Current
Resolution
Current Accuracy
C.C. MODE
0.025mS∼10mS / Res: 1µS
1mS∼30S / Res: 1mS
1µS /1mS+100ppm
0.001∼0.25A/µS
0.01∼2.5A/µS
0.001A/µS
0.01A/µS
0∼6A
0∼60A
1.5mA
15mA
0.4% F.S.
MEASUREMENT SECTION
VOLTAGE READ BACK
Range
Resolution
Accuracy
0∼16V
0∼80V
0.5mV
2.5mV
0.05%+0.05% F.S.
CURRENT READ BACK
Range
Resolution
Accuracy
0∼6A
0∼60A
0.1875mA
1.875mA
± (0.1%+0.1% F.S.)
PROTECTIVE SECTION
Over Power Protection
≒ 31.2W
≒ 312W
Over Current Protection
≒ 6.12A
≒ 61.2A
Over Temperature Protection
Over Voltage Protection
≒ 85°C
≒ 81.6V/16.3V
GENERAL
SHORT CIRCUIT
Current (CC)
Voltage (CV)
Resistance (CR)
INPUT RESISTANCE (LOAD OFF)
SIZE
WEIGHT (Approx.)
EMC and SAFETY
≒ 6.6/6A
0V
≒ 66/60A
0V
≒ 1.25Ω
≒ 0.025Ω
100KΩ (Typical)
81(W)× 172(H)×495(D)
4.2Kg
CE
1-4
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General Information
MODEL MML-80-120-601
POWER
CURRENT
VOLTAGE
MINIMUM OPERATING VOLTAGE (DC)
CONSTANT CURRENT MODE Range
60W
0∼12A
600W
0∼120A
1∼80V
1.0V at 12A
1.0V at 120A
0∼12A
0∼120A
3mA
30mA
0.1%+0.1%F.S. 0.1%+0.2%F.S.
0.0125Ω∼50Ω (600W/16V)
CONSTANT RESISTANCE MODE Range
0.625Ω∼2.5KΩ (600W/80V)
Resolution
12 bits
Accuracy
CRL (50Ω): 0.4mho+0.5% (top)
CRH (2.5KΩ): 0.04mho+0.2%
(bottom)
1∼80V
CONSTANT VOLTAGE MODE Range
Resolution
20mV
Accuracy
± (0.05%+0.1%F.S.)
Resolution
Accuracy
DYNAMIC MODE
DYNAMIC MODE
T1 and T2
Accuracy
Slew Rate
Resolution
Current
Resolution
Current Accuracy
C.C. MODE
0.025mS∼10mS / Res: 1µS
1mS∼30S / Res: 1mS
1µS /1mS+100ppm
0.002∼0.5A/µS
0.02∼5A/µS
0.002A/µS
0.02A/µS
0∼12A
0∼120A
3mA
30mA
0.4% F.S.
MEASUREMENT SECTION
VOLTAGE READ BACK
Range
Resolution
Accuracy
0∼16V
0∼80V
0.5mV
2.5mV
0.05%+0.05% F.S.
CURRENT READ BACK
Range
Resolution
Accuracy
0∼12A
0∼120A
0.375mA
3.75mA
0.1%+0.1% F.S.
PROTECTION SECTION
Over Power Protection
≒ 62.4W
≒ 624W
Over Current Protection
≒ 12.24A
≒ 122.4A
Over Temperature Protection
Over Voltage Protection
≒ 85°C
≒ 81.6V/16.3V
GENERAL
SHORT CIRCUIT
Current (CC)
Voltage (CV)
Resistance (CR)
INPUT RESISTANCE (LOAD OFF)
SIZE
WEIGHT (Approx.)
EMC and SAFETY
≒ 13.2/12A
0V
≒ 132/120A
0V
≒ 0.625Ω
≒ 0.0125Ω
100KΩ (Typical)
162(W)× 172(H)×495(D)
8.4Kg
CE
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Sorensen MML Series Operation and Programming Manual
MODEL MML-500-10-301
POWER
CURRENT
VOLTAGE
MIN. OPERATING VOLTAGE (DC)
CONSTANT CURRENT MODE
Range
Resolution
Accuracy
CONSTANT RESISTANCE MODE
Range
Resolution
Accuracy
CONSTANT VOLTAGE MODE
Range
Resolution
Accuracy
30W
0∼1A
300W
0∼10A
2.5∼500V
2.5V at 1A
2.5V at 10A
0∼1A
0∼10A
0.25mA
2.5mA
0.1%+0.1%F.S.
0.1%+0.2%F.S.
1.25Ω∼5KΩ (300W/125V)
50Ω∼200KΩ (300W/500V)
12 bits
5KΩ : 0.02 mho+0.2%
200KΩ : 0.005 mho+0.1%
2.5∼500V
125mV
0.05%±0.1%F.S.
DYNAMIC MODE
DYNAMIC MODE
T1 & T2
Accuracy
Slew Rate
Resolution
Current
Resolution
Current Accuracy
C.C. MODE
0.025mS∼10mS / Res: 1µS
1mS∼30S / Res: 1mS
1µS /1mS+100ppm
0.16∼40mA/µS
1.6∼400mA/µS
0.16mA/µS
1.6mA/µS
0∼1A
0∼10A
0.25mA
2.5mA
0.4% F.S.
MEASUREMENT SECTION
VOLTAGE READ BACK
Range
Resolution
Accuracy
0∼125V
0∼500V
4mV
16mV
0.05%+0.05% F.S.
CURRENT READ BACK
Range
Resolution
Accuracy
0∼1A
0∼10A
0.032mA
0.32mA
0.1%+0.1% F.S.
PROTECTION SECTION
Over Power Protection
≒ 31.2W
≒ 312W
Over Current Protection
≒ 1.02A
≒ 10.2A
Over Temperature Protection
Over Voltage Protection
≒ 85°C
≒ 510V/127.5V
GENERAL
SHORT CIRCUIT
Current (CC)
Voltage (CV)
Resistance (CR)
INPUT RESISTANCE (LOAD OFF)
SIZE
WEIGHT (Approx.)
EMC & SAFETY
≒ 1.1/1A
0V
≒ 11/10A
0V
≒ 50Ω
≒ 1.25Ω
100KΩ (Typical)
81(W)× 172(H)×495(D)
4.2Kg
CE
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General Information
MODEL MML-500-20-601
POWER
CURRENT
VOLTAGE
MIN. OPERATING VOLTAGE (DC)
CONSTANT CURRENT MODE
Range
Resolution
Accuracy
CONSTANT RESISTANCE MODE
Range
Resolution
Accuracy
CONSTANT VOLTAGE MODE
Range
Resolution
Accuracy
60W
0∼2A
600W
0∼20A
2.5∼500V
2.5V at 2A
2.5V at 20A
0∼2A
0∼20A
0.5mA
5mA
0.1%+0.1%F.S. 0.1%+0.2%F.S.
0.625Ω∼2.5KΩ (600W/125V)
25Ω∼100KΩ (600W/500V)
12 bits
2.5KΩ : 0.05mho+0.2%
100KΩ : 0.005mho+0.1%
2.5∼500V
125mV
0.05%±0.1%F.S.
DYNAMIC MODE
DYNAMIC MODE
T1 & T2
Accuracy
Slew Rate
Resolution
Current
Resolution
Current Accuracy
C.C. MODE
0.025mS∼10mS / Res: 1µS
1mS∼30S / Res: 1mS
1µS /1mS+100ppm
0.32∼80mA/µS
3.2∼800mA/µS
0.32mA/µS
3.2mA/µS
0∼2A
0∼20A
0.5mA
5mA
0.4% F.S.
MEASUREMENT SECTION
VOLTAGE READ BACK
Range
Resolution
Accuracy
0∼125V
0∼500V
4mV
16mV
0.05%+0.05% F.S.
CURRENT READ BACK
Range
Resolution
Accuracy
0∼2A
0∼20A
0.0625mA
0.625mA
0.1%+0.1% F.S.
PROTECTION SECTION
Over Power Protection
≒ 62.4W
≒ 624W
Over Current Protection
≒ 2.04A
≒ 20.4A
Over Temperature Protection
Over Voltage Protection
≒ 85°C
≒ 510V/127.5V
GENERAL
SHORT CIRCUIT
Current (CC)
Voltage (CV)
Resistance (CR)
INPUT RESISTANCE (LOAD OFF)
SIZE
WEIGHT (Approx.)
EMC & SAFETY
≒ 2.2/2A
0V
≒ 22/20A
0V
≒ 25Ω
≒ 0.625Ω
100KΩ (Typical)
162(W)× 172(H)×495(D)
8.4Kg
CE
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2 INSTALLATION
2.1
Introduction
This chapter discusses installation of the Load to the Mainframe, Load connections,
and unit self-tests, as well as application considerations.
2.2
Inspection
As soon as the instrument is unpacked, inspect any damage that might have occurred
in shipping. Keep all packing materials in case the Load or the Mainframe has to be
returned. If any damage is found, please file a claim with the carrier immediately. Do
not return the instrument to Sorensen without prior approval.
In additon to this manual, be sure that the following items have also been received with
your Mainframe and Load:
•
•
Mainframe: Power Cord
Load Module: Measurement and Load Cables
2.3
Installing the Modules
CAUTION!
Load module can be damaged by electronic discharge (static electricity).
Use standard anti-static work practices when you handle and install modules.
Avoid touching the connector and the circuit board.
The Sorensen MML-4 Mainframe can accommodate four single-width Loads
(MML-80-20-102, MML-80-60-301), or two double-width Loads (MML-80-120-601).
Loads can be combined in the Mainframe in any order. The Sorensen MML-2
mainframe can accommodate two single-width Loads or one double-width Load.
Module installation procedures in both Mainframes are the same. Installing Loads to
the Mainframe requires only a screwdriver.
Procedures
1. Disconnect the power cord with the Mainframe power off.
2. Remove any packing materials from the Mainframe.
3. Start installing the modules in the slot (see Figure 2-1).
4. Plug the load module into the slot of the Mainframe along the rail.
5. Lock the module in place by use of the screwdriver (see Figure 2-1).
6. Install each additional module in the slot next to the previous one.
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Sorensen MML Series Operation and Programming Manual
Figure 2-1 Installing Modules in the Electronic Load
WARNING!
If the Mainframe is not installed with all modules, the empty module position
must be installed with the panel cover (Sorensen part no. 5361527-06) for safety
and airflow.
2.3.1
Channel Number
The channel number of a specific Load is determined by the location of that module in
relation to the farthest left side of Mainframe. Because some Load (MML-80-20-102)
has two channels in one module, channel 1 and 2 are always on the farthest left slot of
the Mainframe, and channel 7 and 8 on the farthest right. The channel number is fixed
for Mainframe even Load module is empty. Figure 2-2 shows the channel
assignments for a Sorensen MML-4 Mainframe containing two Loads of
MML-80-60-301 single channel/module, and two Loads of MML-80-20-102 double
channel/module. Channel number is automatically assigned to each channel: 1, 3, 5,
6, 7, 8. At this moment, channels 2 and 4 are empty. MML-2 Mainframe has only
four channels (1, 2, 3, 4).
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Installation
Figure 2-2 Channel Number Example
2.4
Installing the Mainframe
The electronic Load operates properly within a temperature range of 0 to 40º C.
However, you must install the electronic Load in a location that has enough space at
the top, four sides, and the rear of the unit for adequate airflow. Leave at least 3 cm
(1 inch) above the unit for adequate air circulation. Note that the feet of the unit
provide vertical space for air circulation when it is stacked. The feet of the Mainframe
can be removed for rack mounting.
If you install equipment above the electronic Load in the cabinet, you must use a filter
panel above the unit to ensure adequate air circulation. A 1U (EIA standard) panel is
sufficient.
2.4.1
Changing Line Voltage
The electronic Load can operate with a 115/230 Vac input as indicated on the rear LINE
label. The 100/200 line voltage input model is used only in Japan. If the factory set
switch on this label does not correspond to your nominal line voltage, turn the
Mainframe power off, and disconnect the power cord. Set switch to the correct line
voltage as shown in Figure 2-3.
NOTE: Line fuses do not need to be changed when the line voltage is changed.
line fuses will protect the electronic Load in any indicated voltage setting.
The
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Sorensen MML Series Operation and Programming Manual
Figure 2-3 Line Voltage Switch
2.4.2
Turn-On Self-Test
Before turning on the Load, check the following:
1. The unit has been factory set to the correct line voltage.
the rear panel.
2. The power cord is connected to the AC input socket.
Refer to line voltage on
WARNING!
Power provides a chassis ground through a third connector. Be sure that your
outlet is of three-conductor type with the correct pin connected to earth ground.
Turn on the Load by the power switch on the front panel of the Mainframe, and observe
the display. Immediately after turning on, the electronic Load executes a self-test
which checks the GPIB interface board and the input circuitry of the installed modules.
All of the LED segments on the front panel are activated momentarily. The Mainframe
displays
GPIB ADDRESS = 1
and then displays
LOAD MODULE
CHANNEL SCANing
The LCD displays the GPIB address in power-on condition. The GPIB address switch
is on the rear panel if the GPIB card is installed. If the GPIB card is not installed, the
LCD will show LOAD MODULE CHANNEL SCANing. The Mainframe checks the existing
channels when the display is CHANNEL SCANing. The LEDs on the front panel are
activated momentarily. If the Mainframe fails any portion of the self-test, the LED will
blink, and the LCD has no display. When self-test completes, the Mainframe will
display the active channel which is installed.
The Load module also executes a self-test that checks firmware and communication
with Mainframe. All of the LEDs on the front panel are activated momentarily, and the
7-segment LED displays model number as well as firmware version. If any error is
found in self-test, the display will stuck here. Check the Load and Mainframe
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Installation
connection when an error occurs. When the self-test completes, the 7-segment will
display measurement V and I. The double channel/module goes to L channel.
MML-80-60-301 < --- Model Number
< --- F/W version
1.02
Figure 2-4 Module Panel Self-test Display
In case of failure, return the Mainframe or Load module to Sorensen sales or service
office for repair.
2.5
Application Connection
2.5.1
Load Connections
WARNING!
To satisfy safety requirements, load wires must be heavy enough not to overheat
while carrying the short-circuit output current of the device connected to the
electronic Load.
Before connecting load wires to Load module, remove the terminal cover from the Load.
Install it after load wires are connected. Input connections are made to the + and −
terminal block on the front of each Load module. The major considerations in making
input connections are the wire size, length and polarity. The minimum wire size
required to prevent overheating may not be enough to maintain good regulation. The
wires should be large enough to limit the voltage drop to no more than 0.5V per lead.
The wires should be as short as possible, and bundled or tied together to minimize
inductance and noise picked up from them. Connect the wire from the PLUS (+)
terminal on the module to the HIGH potential output terminal of the power supply (UUT).
Connect the wire from the MINUS (−) terminal on the module to the LOW potential
output terminal of the power supply (UUT). Figure 2-5 illustrates the typical setup for
the Load module to the UUT.
WARNING!
To prevent accidental contact with hazardous voltage, cover of terminal must be
installed correctly. Each terminal can carry 40 Amps at most. If input current
of Load is over 40 Amps, you must use multiple terminals of connections.
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Sorensen MML Series Operation and Programming Manual
Figure 2-5 Load and Remote Sensing Connection
2.5.2
Remote Sensing Connections
There are two sensing points for the electronic Load module. One is measurement at
the Load terminal, and another is measurement at Vsense. The Load module will
automatically switch to Vsense when Vsense terminals are connected to UUT,
otherwise it will measure at Load terminals. Remote sensing compensates for voltage
drop in applications that require long lead lengths. It is useful when a module is
operating in CV or CR mode, or when it needs precise measurement. Figure 2-5 also
illustrates a typical setup for remote sensing operation.
NOTE: The potential of Vsense red connector must be higher than that of Vsense
black connector.
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Installation
2.5.3 Parallel Connections
Figure 2-6 illustrates how modules can be paralleled for increased power dissipation.
Modules can be directly paralleled in CC and CR modes of static operation, but cannot
be paralleled in CV mode. Each module will dissipate the power it has been
programmed. For example, if two modules are connected in parallel, one is
programmed 10A, and another 15A, the total current drawn from the source is 25A.
Figure 2-6 Parallel Connections
2.6
Remote Control Connection
The remote operation of Load can be done through GPIB or RS-232C. These
connectors on the rear panel connect the Load to the controller or computer.
The GPIB interface of the electronic load is optional. The MML series Remote
Controller can control load through RS-232C port. Connect Remote Controller to the
electronic Load before powering on. If you have not done thus, Load will shut down,
or fuse for remote controller in Mainframe will be broken.
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3 OPERATION OVERVIEW
3.1
Introduction
The Sorensen MML-4 and MML-2 multiple electronic load mainframes are used for
design, manufacturing, testing and quality assurance. The Mainframe contains four
(or two) slots for load modules. Load modules occupy either one or two slots. It
depends on the power rating of the module. The Mainframe can dissipate up to 1200
watts when it is full loaded. It contains a processor, GPIB and RS-232C connectors,
front panel keypad and display, and PASS/FAIL signals. Built-in remote control
functions allow you to control and read back current, voltage, and status. The SYNC
function of the Mainframe synchronizes each module when module current/voltage level
changes. Save/Recall feature allows you to save up to 100 files, 10 programs, and
one default setting. All of them can be saved in Mainframe EEPROM for future use.
The Mainframe contains three (or two) cooling fans, and the module contains one
cooling fan. The fan speed automatically increases or decreases as the module power
rises or falls. This feature reduces overall noise level because the fans do not always
run at the maximum speed.
Each module can operate independently in constant current (CC), constant resistance
(CR), and constant voltage (CV) modes. An individual module may have one or two
channels. Each of them has its own channel number, contains its own input
connectors, and can be turned on/off or short-circuited independently. If your
application requires a power or current capacity greater than one module can provide,
you must connect the load modules in parallel in CC or CR mode.
Each load module can be independently controlled either remotely via GPIB/RS-232C
or locally via a keypad on the front panel. Once a channel is selected or addressed, all
subsequent commands go to that channel until another channel is selected or
addressed. Operation of all models in the Mainframe is similar regardless of power
ratings.
3.2
Front Panel Description
The front panel of Mainframe includes a 16 × 2-character LCD display, 8 (4) channel
indicators, and keypads. All parameters of the Load are set through the Mainframe.
The LCD display also shows which function is being performed when you use the
keypads. Three of the keys perform two functions. The alternative function is labeled
in blue above the key. It is selected by pressing the blue SHIFT key and the function
key simultaneously.
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3.3
Rear Panel Description
The rear panel of Mainframe includes an RS-232C connector, a GO/NG output port, an
AC LINE socket, a fuse holder, an optional GPIB connector, and three cooling fans.
Figure 3-1 shows the rear panel of the MML-4 Mainframe.
Figure 3-1 Rear Panel of MML-4 Mainframe
3.4
Local/Remote Control
Local (front panel) control is in effect immediately after power is applied. The front
panel keypad and display allow manual control of individual modules when the Load is
used in bench test applications. Remote control goes into effect as soon as the
Mainframe receives a command via GPIB or RS-232C. With remote control in effect,
only the computer can control the Load. The front panel keypad has no effect except
the LCL key. You can return the Load to local control from remote control by pressing
LCL key. The SHIFT key acts as LCL when the Load is in a remote state.
Most of the functions that perform remotely can perform locally too at the front panel of
Mainframe. The keypads on the module can perform simple functions like short, load
on/off, static /dynamic, and load A/B or display selection R/L.
Instructions for local operation are detailed in Chapter 4.
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Operation Overview
3.5
Modes of Operation
There are three modes of operation: Constant Current (CC), Constant Resistance (CR),
and Constant Voltage (CV).
When you press the ENTER key to program to a mode, a module will change to a new
mode. When changing modes, the module’s input is momentarily disabled before a
new mode is enabled. This ensures that there will be minimum overshoots in change
of modes. The parameters in current, resistance or voltage mode can be programmed
simply as the mode is presently selected.
All data set in CC/CR/CV mode will be rescaled to fit the resolution of current/voltage
levels or slew rate. In local mode, any value can be set to a module from the keypad.
There are no upper and lower limits that would cause an error. The Mainframe
automatically selects data which are rescaled from the programmed value, truncates
and checks the high and low boundaries before fitting memory. When programmed
data are over the boundary, the Mainframe will set maximum or minimum level for the
Load module. In remote mode, an error will occur when data are over the maximum or
minimum value.
3.5.1
Constant Current Mode
Figure 3-2 Constant Current Mode
In CC mode, the Load will sink a current in accordance with the programmed value
regardless of input voltage. The CC mode can be set with the MODE key on the front
panel. When MODE SELECT is displayed, it means to select static low range CCL or
static high range CCH.
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Current Ranges (Low, High)
Current can be programmed in either of the two ranges, low range and high range.
The low range provides better resolution at low current setting. If any value is over the
maximum of low range, you must select the high range. Press the MODE key first,
then use the UP or DOWN key to select the current range.
MODE SELECT
CCL
Select Static Constant Current low range
MODE SELECT
CCH
Select Static Constant Current high range
MODE SELECT
CCDL
Select Dynamic Constant Current low range
MODE SELECT
CCDH
Select Dynamic Constant Current high range
Select range by pressing the ENTER key.
Changing the mode or the range affects the module. Both cause the input to go
through an off state. If the CC mode of Load module is active, the new setting will
immediately change the input at a rate determined by the slew rate setting.
STATic/DYNAmic Functions
In CC mode two operation functions (STATic, DYNAmic) can be selected. STATic
function checks the stability of output voltage from a power supply. In some modules
(single channel/module) there are two current levels (A or B) for static function. Both
states A and B use the same range. You can select A (CCL1 or CCH1) or B (CCL2 or
CCH2) through the A/B key on the module’s keypad or Mainframe keypad when level1
(A) or level2 (B) changes. Slew rate determines the rate at which Load level changes
from one load level state to another. Figure 3-3 shows current level of load module
after pressing of A/B key.
CCL1:4A, CCL2:2A, CCL
: 0.2A/µS, CCL
: 0.08A/µS
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Operation Overview
Current
rise slew rate
fall slew rate
4A
State A
2A
State B
Time
10uS
25uS
press key "A/B"
Figure 3-3 Load Level after Pressing A/B Key
Dynamic load operation enables you to program two load levels (CCDL1, CCDL2), load
, CCDL ). During operation,
duration (CCDLT1, CCDLT2), and slew rate (CCDL
the loading level is switched between those two load levels according to your specific
setting. The dynamic load is commonly used in the test of UUT’s performance under
transient loading condition. Figure 3-4 shows current waveform of dynamic function.
CCDL1:4A, CCDL2:2A, CCDL
CCDLT2:10mS
:1A/µS, CCDL
: 1A/µS, CCDLT1:10mS,
Current
4A
Load1
2A
load2
Time
10mS
T1
10mS
T2
10mS
T1
10mS
T2
Figure 3-4 Dynamic Current Waveform
The STATic/DYNAmic functions can be also selected through STATIC/DYNAMIC key
on the Load module.
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Slew Rate (Rise, Fall A/µS or mA/µS)
Slew rate determines the rate at which the current input of a module changes to a newly
programmed vlaue. There are two slew rate values. One is for rise rate, and another
for fall rate.
Voltage Ranges (Low, High)
There are two voltage ranges for voltage measurement and Von voltage setting. The
low range provides better resolution at low voltage measurements. If any value is over
the maximum of low range, you must select the high range. The voltage range
selection of CC mode is in configuration setting.
3.5.2
Constant Resistance Mode
Figure 3-5 Constant Resistance Mode
In CR mode, the Load will sink a current linearly propotional to the input voltage in
accordance with the programmed resistance. There is a double pole RC filter of input
voltage, so high frequency parts will be removed. The time constant of low pass filter
is about 4.7 mS.
Voltage Ranges (Low, High)
Resistance can be programmed in either of the two ranges, low range and high range.
The low range is used for input voltage in low voltage range while the high range for
input voltage over low voltage range. The current range of CR mode is high range.
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Operation Overview
MODE SELECT
CRL
Select Constant Resistance low voltage range
MODE SELECT
CRH
Select Constant Resistance high voltage range
Select range by pressing ENTER key
If input voltage is over the maximum of low range, you must select the high range.
Press MODE key first, and then use the UP or DOWN key to select voltage range. In
some modules (single channel/module) there are two resistance levels (A or B) for CR
function. Both states A/B use the same range. You can select A (CRL1 or CRH1) or
B (CRL2 or CRH2) through A/B key on the module’s keypad. Slew rate determines
the rate at which load level changes from one load level state to another.
Slew Rate (Rise, Fall A/µS)
Slew rate in constant resistance mode is programmed in Amps/second.
3.5.3
Constant Voltage Mode
Figure 3-6 Constant Voltage Mode
In CV mode the Load will sink current to control the voltage source in programmed
value. In some modules (single channel/module) there are two voltage levels (A or B)
for CV function. You can select A (CV1) or B (CV2) through A/B key on the module’s
keypad. There are two response speeds of CV modes: fast and slow. The fast/slow
respond speed means the slew rate of current change.
Voltage and Current Range (High)
The voltage and current range of CR mode is high range.
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3.6
Load Synchronization
The Sorensen MML-4/MML-2 multiple electronic load mainframes contain eight and
four load channels respectively. The channel on/off or change of load timing is
important. You can set module change synchronously through SYNC RUN in
configuration setting. If a channel is set at SYNC RUN ON, it means that channel
on/off or change of load level is synchronized with other Load modules. In other cases
channel on/off can be controlled only by the module’s LOAD key.
3.7
Measurements
Each module measures current and voltage of the UUT. The sampling rate is about
12 mS. Voltage and current measurements are performed with a 15-bit resolution of
full scale ratings.
3.8
Slew Rate and Minimum Transient Time
Slew rate is defined as the change in current over time. A programmable slew rate
allows a controlled transition from one load setting to another to minimize induced
voltage drops on inductive power wiring, or control induced transients on a test device.
If the transient from one setting to another is large, the actual transient time can be
calculated by dividing the current transition by the slew rate. The actual transition time
is defined as the time required for the change of input from 10% to 90% or from 90% to
10% of the programmed excursion. If the transition from one setting to another is
small, the small signal bandwidth of Load will limit the minimum transition time for all
programmable slew rates. Because of the limit, the actual transition time is longer
than the expected time based on the slew rate. Therefore, both minimum transition
time and slew rate must be considered in the determination of actual transition time.
The minimum transition time is from 24 µS to 6 mS. It depends on slew rate setting.
3.9
Start/Stop Sink Current
In the simulation of transient characteristics of load to UUT, the critical problems are
when and how the Load starts sinking current to UUT. You may set the conducting
voltage Von to solve the problems. The Load will start or stop sinking current when
the output voltage of UUT reaches the Von voltage. You can start sinking current
when setting is load ON, and the input voltage of the module is over Von voltage, but
stop sinking when load OFF, or the input voltage below Von voltage. For start and
stop sinking current, refer to figure 3-7 and 3-8 separately.
There are two operation modes for Von control. One is latch, and another non-latch.
Latch means that when voltage is over Von voltage, Load will start sinking current
continuously in spite that input voltage drop is below Von voltage. Non-latch means
that when input voltage is below Von voltage, Load will stop sinking current. The Von
voltage and operation mode of Von is set in configuration.
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Operation Overview
Figure 3-7 Start Sinking Current (Von Non-Latch)
Figure 3-8 Stop Sinking Current (Von Non-Latch)
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3.10 Short On/Off
The Load module can simulate a short circuit at its input by setting the load on with
full-scale current. The short circuit can be toggled on and off at the front panel or via
remote control. There are two operations for SHORT key on the front panel. One is
toggled on/off, and another controlled by key. They are selected in configuration.
The SHORT key will be enabled only when Load is ON.
Toggled on/off means pressing the SHORT key once to enable short circuit, and again
to disable. Control by Key means pressing and holding the SHORT key to enable
short circuit, and releasing it to return to normal operation.
The actual value of an electronic short depends on the mode and range that are active
when the short is turned on. In CC mode, it is equivalent to programming approximately 110% full-scale current about 30mS for the present current range, and then
going to rating current. In CR mode, it is equivalent to programming the minimum
resistance for the present resistance range. In CV mode, it is equivalent to programming zero voltage. Turning on the short circuit does not affect the programmed setting,
and Load input will return to the previously programmed values when the short circuit is
turned off.
Note that turning on the short circuit may cause the Load to sink so much current to trig
protection circuit, and that will turn off the Load.
3.11 Load On/Off
A module’s input can be toggled on and off through the ON/OFF key on the front panel
of the Mainframe, or the LOAD key on the module or the remote control. The on/off
change of input is done according to the slew rate.
Turning off the load does not affect the programmed setting. The load will return to
the previously programmed values when the Load is turned on again.
3.12 Protection Features
Each load module includes the following protection features: Overvoltage, Overcurrent,
Overpower, Overtemperature, and Reverse Voltage.
The appropriate bits in the Mainframe’s statue registers are set when any of the
protection features mentioned above is active. Besides, the Load’s buzzer will
produce beep sound to inform you until protection status is reset. When any
protection occurs, it will cause the Load input to be turned off.
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Operation Overview
3.12.1
Overvoltage
The overvoltage protection circuit is set at a level slightly above the voltage range
specified in the specification of the Load. The overvoltage (OV) and voltage fault (VF)
status register bits are set when the OV condition occurs. They will remain set until
they are reset. The Load module will display ovP when overvoltage protection occurs.
3.12.2
Overcurrent
When the Load is operating in CR or CV mode, it is possible for a module to attempt to
sink current more than it is rated for. The limit level of current is set at a level slightly
above the current of the Load. The overcurrent (OC) and current error (CE) status
register bits are set when the OC condition occurs, and will remain set until they are
reset. The Load module will display oCP when overcurrent protection occurs.
3.12.3
Overpower
The overpower protection circuit is set at a level slightly above the power range
specified in the specifications of the Load. The overpower (OP) and power error (PE)
status register bits are set when the OP condition occurs, and will remain set until they
are reset. The Load module will display oPP when overpower condition occurs.
3.12.4
Overtemperature
Each Load has an overtemperature protection circuit that will turn off the load if the
internal temperature exceeds a safe limit. The overtemperature (OT) and temperature
error (TE) status register bits are set when the condition occurs, and will remain set until
they are reset. The Load module displays otP if an overtemperature condition occurs.
3.12.5
Reverse Voltage
The Load conducts a reverse current when the polarity of the UUT connection is not
correct. The maximum safe reverse current is the same as the rated current of the
Load. If the reverse current of the UUT is over the rated current of the Load, the Load
may be damaged. If a reverse voltage condition is detected, you must turn off power
to the UUT immediately, and make a correct connection. The reverse voltage (RV)
and voltage fault (VF) status register bits are set when the RV condition occurs, and will
remain set until they are reset. The Load module will display rEv when reverse voltage
protection occurs.
All of the protection features will latch when they are tripped. When any protection
occurs the module will turn off the load input, and produce beep sound until you remove
the condition and reset protection by pressing LOAD key on the module.
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CAUTION!
To protect the electronic Load from possible damage, the input voltage must not
exceed the maximum input voltage rating specification. In addition, the Load
+Terminal potential must be more than −Terminal potential.
3.13 Save/Recall Setting
The setting of the electronic Load for all channels can be saved and recalled for use in
various test setups. This simplifies the repetitive programming of different things.
The present setting of mode parameters (CC, CR, CV), programs and power on status
(DEFAULT) can be saved in the EEPROM using SAVE key. Later you can recall the
settings from the specified file using RECALL key. The SAVE and RECALL keys
affect all channels simultaneously.
3.14 Program
The program feature is so powerful. It allows you to simulate various test conditions.
There are ten programs in the electronic Load. Each program has ten sequences.
The setting mapping of program sequence to file is one to one. It means that program
1, sequence 1 maps to file 1, and program 3, sequence 4 maps to file 24.
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4 LOCAL OPERATION
4.1
Introduction
This chapter describes how to operate the electronic load from the local panel in details.
The descriptions include: Mainframe panel control, Module panel control and indicators.
4.2
Local Operation of Load Mainframe
In order to use the front panel keys to control the electronic load, local operation must
be in effect. Immediately after power is applied, local operation will be in effect.
When local operation is in effect, you can select a channel, and use the display as well
as keypad on the front panel to control the Load. The display of Mainframe can be
used to view the programmed setting of a selected channel. The input voltage/current
is displayed on module’s display. The mainframe will scan module type at power-on,
and memorize it for channel setting.
NOTE: When you edit setting, the display will blink setting, and let you know that the
active setting is to be edited or selected.
In the remote state, the keys on the front panel will have no effect. Only the remote
controller can program the Load. The display of module will show the present input
voltage and current readings or the last display while the local state is in effect. The
display of the Mainframe will show REMOTE message.
NOTE: When setting the load module level, the resolution of current, voltage,
resistance, and slew rate setting will be different from the entered values. The
displayed or stored value of the setting will be the actual value of D/A programmed in
the load module. The current, voltage, and slew rate setting will be degraded as lower
values are entered. The resistance setting will be degraded as higher values are
entered.
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Figure 4-1 Front Panel of Mainframe
c Power Switch. Turns the AC power on and off.
d LCD Display. Displays channel information.
e Channel Indicator. Indicates the active channel settings.
f Function keys:
CHAN.
To select a channel for settings.
MODE.
To select a mode for settings.
PROG.
To select a program for settings or running.
CLEAR. To clear the digit entered from keypad.
incorrect digits before they are entered.
This key allows you to change
RECALL. To recall the saved settings from EEPROM, and all channels’ settings
from specified files (1 to 101). Recalling file 101 means to recall the factory
default settings. Recalling program is from PROG, number 1 to 10.
SAVE. To save all of the present mode settings of all channels in the specified
files (1 to 100). Saving program is from 1 to 10. Saving DEFAULT is to save the
status of all channels for the next time the electronic Load is turned on. All saved
settings are stored in EEPROM, and will not be lost when ac power is cycled.
SPEC.
To select specification data for editing, or to enable SPEC function.
CONF.
To select configuration data for editing.
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Local Operation
g Entry keys:
and v. The UP and DOWN keys allow you to scroll through the choices in a
^
parameter list that is applied to a specific command. Parameter lists are circular;
you can return to the starting position by pressing either of the keys continuously.
ON/OFF. Toggles the output of the electronic Load between on and off states if
channel SYNC. RUN is set to ON.
ENTER. Executes the entered value or the parameter of the presently accessed
command. The parameters you have entered with other keys are displayed but
not entered into the Load until you press this key. Before pressing ENTER you
can change or abort anything previously entered into the display.
SHIFT. Enables a shifted key to function (LOCK, SYS).
state, this key acts as a local key.
1 – 9 Used to enter numeric values.
.
When in remote control
Decimal point.
4.2.1 Selecting the Channel
The CHAN key is used to select one of the channels for local control. See channel
number in 2.3.1. To edit channel settings, you must select a channel first. If the
channel does not exist, it cannot be selected. If no module is installed in the
mainframe, the display will show DUMMY CHANNEL. When you press CHAN, the
channel number you want to select will automatically increase to the next existing
channel. The mainframe will scan the module type at power-on, and memorize it for
channel editing.
4.2.2
Setting the Operation Mode
The MODE key and the
and v keys are used to select modes of channels for local
control. Press MODE to display the selected channel’s active mode. The active
mode can be changed by use of the
or v key followed by the ENTER key. The
sequence of mode selection after pressing the v key is as follows:
^
^
CCL -> CCH -> CCDL -> CCDH -> CRL -> CRH -> CV go back to CCL.
Press the ENTER key to select the mode and confirm the setting.
NOTE: The eight operation modes of load module settings stored in the mainframe
are independent. Changing one mode setting will not affect other modes. Storing the
settings to EEPROM (1-100) will store only one mode setting.
The load levels and slew rates are common to CC and CR modes. CV mode sets
voltage level and response speed. There are two level settings for a single channel/
module of CC, CR, and CV modes. They can be switched by the module’s A/B key.
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Setting CC Values
There are four modes for CC operation: CCL, CCH, CCDL, CCDH. The current levels
are programmed in Amps. The slew rate levels are programmed in milliamps/µS at
low range and in Amps/µS at high range. The timings are programmed in milliseconds.
The setting buffers of four CC modes are independent. Changing the operation range
does not affect the settings of other ranges.
The following examples illustrate how to set the CC values of Load module for model
MML-80-60-301. Before observing the examples, select channel first.
1.
Select Range/Function
Press MODE, use the
^ or v key to select CCL, then press ENTER.
CCL: static low range
CCDL: dynamic low range
CCH: static high range
CCDH: dynamic high range
MODE SELECT
CCL
2.
Set Current Level
There are 4000 discrete steps from 0 to full scale in each range. Set level1 (A)
current level to 2 amps by pressing 2, ENTER. Set level2 (B) current level to 1
amp by pressing 1, ENTER.
CCL1:
CCL2:
3.
1.9995A
0.9990A
Set Slew Rate
There are 250 discrete steps in each range. Set the rise 50 mA/µS and fall slew
rates to 50 mA/µS by pressing 5, 0, ENTER for rise and 6, 0, ENTER for fall slew
rate.
CCL
: 50mA/µS
CCL : 60mA/µS
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Local Operation
4.
Set DYNAmic Function Periods
Dynamic function has period T1 and T2 to be set. Set dynamic period 1 to 0.1 mS,
period 2 to 0.2 mS by pressing 0, ., 1, ENTER and 0, ., 2, ENTER. The range of
Dynamic period is from 0.025 µS to 30 sec.
CCDLT1:
CCDLT2:
0.100mS
0.200mS
NOTE: If you press the ENTER key, and the blinking data do not go to next, change
configuration setting Enter Data Next to YES.
Setting CR Values
^
To program the CR values for the selected channel, press the MODE, , and ENTER
keys. The resistance values can be programmed in low voltage (CRL) or high voltage
(CRH) range. The current is always in high range. ALL resistance levels are
programmed in ohms. The slew rate is in A/µS.
The following examples illustrate how to set CR values of Load module for model
MML-80-60-301.
1.
Select Range
Press MODE, and use the
^ and v key to select CRL, then press ENTER.
MODE SELECT
CRL
2.
Set Resistor Level
There are 4000 discrete steps from 0 to full scale in each range. Set the main
resistor level1 (A) to 2 ohms by pressing 2, then ENTER. Set the level2 (B)
resistor level to 1 ohm by pressing 1, then ENTER.
CCL1:
CCL2:
3.
2.000Ω
1.000Ω
Set Slew Rate
There are 250 discrete steps in each range. Set the rise and fall slew rates to 0.1
A/µS by pressing ., 1, then ENTER for rise slew rate and ., 2, then ENTER for fall
slew rate.
CRL
CRL
: 0.10A/µS
: 0.20A/µS
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Setting CV Values
^
Set the CV values for the selected channel by pressing MODE, , and then ENTER
keys. The voltage values can be programmed in one range. The voltage levels are
programmed in volts. The response speed is programmed in fast/slow operations.
The examples below illustrate how to set CV values of the Load module for model
MML-80-60-301. Before following the examples, select channel first.
1.
Select Range
Press MODE and use the
^ or v key to select CR followed by ENTER key.
MODE SELECT
CV
2.
Set Voltage Level
There are 4000 discrete steps from 0 to full scale in each range. Set the main
voltage level1 (A) to 5 volts by pressing 5, ENTER. Set the level2 (B) voltage level
to 6 volts by pressing 6, then ENTER.
CV 1: 5.00V
CV 2: 6.00V
3. Set Response Speed
There are two response speeds for CV mode, fast and slow, for different UUT
testing. For demanding load tests, use the fast response speed. Refer to
Figures 4-2 and 4-3 for transfer functions.
CV RESPONSE
1:FAST 2:SLOW
Figure 4-2 CV Response Transfer Function (FAST)
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Local Operation
Figure 4-3 CV Response Transfer Function (SLOW)
4.2.3
Setting the Program
The electronic Load is able to select customized basic tests, and link them into a
program test for automatic execution.
The PROG key is used to select a program, or recall a program for local control.
There are ten programs (1-10). Each program has ten sequences to map files from 1
to 100. Program 1 maps files from 1 through 10. Table 4-1 shows the relationship
between the program sequence and the corresponding file.
Program 1 Sequence No.
Corresponding File No.
Program 2 Sequence No.
Corresponding File No.
:
:
Program 10 Sequence No.
Corresponding File No.
Table 4-1
1
1
1
11
2
2
2
12
3
3
3
13
4
4
4
14
5
5
5
15
6
6
6
16
7
7
7
17
8
8
8
18
9
9
9
19
10
10
10
20
1
91
2
92
3
93
4
94
5
95
6
96
7
97
8
98
9
99
10
100
Relationship Between Program Sequence and Corresponding File
When running a program, you must set its corresponding file parameters first. If one
program sequence is not enough for you to test the UUT, you can use the program
chain function to get more sequences.
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Press the PROG key, and the LCD will display as follows. Press number 1 -10
and v keys to edit
followed by ENTER to recall a program from EEPROM, or use the
the program.
^
PROGRAM SELECT
No: 1
1.
Setting the Active Channels
The LCD displays the active channels for the program to control. The LED
channel indicators will be active if the channel is active. The channel can be
active only when it exists and the mode of SYNC. RUN is ON. When the channel
is not selected, or does not exist, the channel number will not be displayed. Press
numbers 1 to 8 to enable or disable the active channel.
ACTIVE CHANNEL
1
3 5 6 7 8
2.
Setting the Program Chain
The chain function enables you to chain programs together to allow a greater
number of sequences for testing. Setting the program chain number to 0 means
no programs have been chained. Program chain function can chain itself for loop
test, or chain other programs. Press 1, then ENTER to set chain itself for loop test.
The default setting is 0.
PROGRAM CHAIN
No: 1
3.
Setting the Sequence P/F Delay Time
The sequence Pass/Failure delay time allows you to set the delay time for P/F
checking when the load condition changes. The failure status of the sequence will
latch when a program is executed. It means that any failure will be memorized
even when the UUT becomes stable within the specifications later. The P/F delay
time range is from 0 to 60 seconds. Press 1, then ENTER to set the sequence
P/F delay time to 1 second. The default setting is 0.
SEQ. P/F DELAY
TIME:
1.0Sec
4.
Setting the Sequence ON/OFF Time
The sequence ON/OFF time controls the Load input ON/OFF when the program
sequence is executed. The range of ON/OFF time is from 0 to 60 seconds.
SEQ. ON TIME
TIME: 1.00Sec
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Local Operation
Press 0, then ENTER to set OFF time to 0 seconds.
seconds for OFF time.
The default setting is 0
SEQ. OFF TIME
TIME:
0.00Sec
5.
Setting the Sequence Mode
There are three modes to control the method of sequence execution.
•
SKIP:
•
AUTO: Use ON/OFF time to control Load input on/off. When ON/OFF time
passes, the Load will get to the next sequence automatically.
•
MANUAL:
Skip the sequence.
Use the
Load will not change input status.
^ or v key or numbers 0 to 9 to control the execution
sequence. Pressing number keys allows random selection of sequence
numbers to execute. Pressing 0 means to go to sequence 10.
Press 2, then ENTER to set sequence 1 to manual mode. You must set ten
sequence settings for one program. The default setting is SKIP.
SEQ 1: SKIP=0
AUTO=1 MANUAL=2
6.
Setting the Short Channel
When the sequence mode is not SKIP, you must set the short channel and time.
The short channel is selected as an active channel. To select the short channel,
press numbers 1 through 8 to enable or disable the corresponding module’s short
function.
SEQ. 1 SHORT CH.
3
5 6 7 8
1
7.
Setting the Short Time
The short time range is from 0 to 30 seconds. The short time must be ≤
SEQuence ON time. If the short channel is not selected, or the short time is set to
0 seconds, the selected channel will not short. The default setting is channel 0
and 0 seconds.
SEQ. 1
SHORT TIME= 0.0S
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4.2.4 Running the Program
Press ON/OFF to run program when program function is selected. The LED channel
indicators will be active if channel is active. The display shows as follows.
PROG. 1 SEQ. 1
[ON][KEY][PASS]
The upper line displays the executed program and sequence number while the lower
line Load, key and test result status.
ON/OFF
:
KEY
:
PASS/FAIL :
It shows Load input status.
It displays when MANUAL mode is active and waiting key input.
It shows the test result compared with SPEC setting.
When the program is executed, the setting of sequence will recall files from EEPROM,
and the SPEC function is always ON. All function keys are disabled until ON/OFF is
pressed to stop the program, or program run finishes. When the program is stopped
or finished, the LCD will display the following:
PROGRAM OFF
RESULT :PASS
It means that in testing the program, all sequences have passed.
LCD will display the following.
If the test fails, the
PROG. XX : 1 2
3 4 5 6 7 8 9 10
PROG. XX (1 through 10) stands for the file number of the program that failed. In
addition, 1, 2, 3...10 appears in the display to indicate the failed sequence numbers.
The failed sequences are the results of all failed channels. The LED of the failed
channel will be illuminated. In the test by program chain, if the failed program files are
more than one set, you can use
and v to read the contents of failed programs.
^
4.2.5
Setting the Specifications
The SPEC key is used to enable or disable the SPEC function, or to set specifications.
The Load will compare measurement data with the set specifications of HIGH and LOW
boundary when the SPEC TEST is ON, and the LED, GO/NG, is lighted on the module
panel. To set specifications for a module, you must go to mode editing by pressing
MODE, ENTER, and then the SPEC key.
In other operation modes, pressing SPEC will enable or disable the SPEC TEST
function. The SPEC TEST ON/OFF function is global. It means that all modules
installed on the Mainframe will do GO/NG comparison. The specification unit of CC
and CR modes is volts while that of CV mode is current. There are three levels for
each mode: CENTER, HIGH, and LOW. The CENTER level must be set by the value
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of channel input reference level. The HIGH and LOW levels can be set by the value or
percentage selected in configuration SPEC. ENTRY MODE. The HIGH/LOW
percentage range is from 0 to 100%.
Press MODE, ENTER, SPEC to set the specifications of CC mode.
to set CENTER level 5V.
Press 5, ENTER
VOLTAGE SPEC.
CENTER: 5.0000V
Press 5,
ENTER
to set HIGH level 5%.
VOLTAGE SPEC.
HIGH PCet: 5.0%
Press 5,
ENTER to set LOW level 5%.
VOLTAGE SPEC.
LOW Pcet:
5.0%
The default setting of HIGH and LOW is 100%. The CENTER value is half of the
range. To select the specifications set by Value or Percentage, please refer to 4.1.6.
4.2.6 Setting the Configuration
The electronic Load provides useful features such as Von point, Current limit, and Sync
run. To use these powerful features, use the configuration setup procedures to set the
parameters relevant to your application needs. This procedure is only needed for
initial setup of a test operation. The configuration of each channel is stored
independently in the EEPROM of the Mainframe. To set configuration you must press
CONF.
Set the voltage range of CC mode. There are two voltage ranges for CC mode.
High range is for high voltage and low range is for low voltage to get better voltage
resolution. The default setting of Vrange is HIGH.
CC Vrange Select
1:HIGH
2=LOW
Set Von point. Von is the conduction voltage level when the electronic Load starts to
sink current and the UUT output reaches the Von voltage. The default setting of Von
voltage is 1V.
Von POINT
VOLTAGE: 3.50V
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Set Von latch. There are two operation modes for Von control. Von latch ON means
that Load will sink current continuously when Von voltage reaches. Von latch OFF
means that Load will stop sinking current when UUT voltage is under Von voltage.
The default setting of Von latch is OFF. Figures 4-4 and 4-5 show Von LATCH ON
and OFF current waveform separately.
Von LATCH
1:ON
2:OFF
CAUTION!
Do not set Von to 0V. This will cause an overshoot spike because the Load circuit
will be ON regardless of no UUT. If a UUT is applied, the overshoot may damage
the UUT regardless of the minimal current setting of the Load.
Figure 4-4 Von LATCH ON Current Waveform
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Figure 4-5 Von LATCH OFF Current Waveform
Set CV mode CURR_LIMIT. This function will limit the current sinking of Load to
protect UUT in CV mode. The default setting of current limit is the maximum Load
current.
CV CURR_LIMIT
CURRENT:20.000A
Set sign of voltage for display. The electronic Load will show a minus sign with the
voltage if you select MINUS. The minus sign occupies one digit of the four digits
displayed. No sign is displayed when you select PLUS. The default setting is PLUS.
SIGN OF VOLT.
1:PLUS 2:MINUS
Set the specifications of entry mode. The specifications of the Load can be set by
VALUE or Percentage for HIGH and LOW data. The percentage values refer to the
CENTER value of the specification. The default setting of SPEC entry mode is
percentage.
SPEC. ENTRY MODE
1:VALUE 2:PCet
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Set SYNChronous run mode. When SYNC run is set at ON, the Load on/off is
controlled by the ON/OFF key on the Mainframe. Under other circumstances, the
Load on/off is simply controlled by the LOAD key on the module. The default setting of
SYNC run is ON.
SYNC. RUN
1:ON
2:OFF
Press ENTER to select data enter mode. If ON is selected for data entry, the setting
will go to the next one after pressing ENTER. If OFF is selected for data entry, the
setting will remain at the same line for additional changes. The default setting is ON.
Enter Data Next
1:ON
2:OFF
Select module SOUND on/off. When you press the key on the module, it will
produce a sound if sound = ON. The default setting of sound is ON.
SOUND
1:ON
2:OFF
Select Load module input status when it is powered ON. If ON is selected, the
module will be active according to AUTO LOADON mode setting. The default setting
of AUTO LOADON is OFF.
AUTO LOADON
1:ON 2:OFF
Select the load on mode of module if AUTO LOADON is ON. If LOAD is selected,
the Load module will be active as DEFAULT setting. If PROG is selected, the module
will be active as the program saved last time. The default setting of AUTO LOADON
MODE is LOAD.
AUTO LOADON MODE
1:LOAD 2:PROG.
Select Load module rotary knob type.
module data with the rotary knob.
There are two types for you to change load
UPDATED means that the data changed by the rotary knob will be updated on the
load module. When you press LOAD key to set load module ON, new data will be
executed.
OLD means that the data changed by the rotary knob will be invalid and the load
module data remain the same if the load module is ON again. For the operation
of rotary knob, please refer to 4.3.1 and 4.3.2.
LOADON KNOB TYPE
1=UPDATED 2=OLD
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Local Operation
Select short key mode. Set SHORT key mode for Load module.
of SHORT mode is TOGGLE.
The default setting
SHORT
1:TOGGLE 2:HOLD
Display versions of load module and mainframe.
LOAD MODEL 80-20-102
Version:
10
Press the ▼ key.
FRAME BOOT PROG.
Version:
1.40
Press the ▼ key.
FRAME DOWN PROG.
Version:
1.21
Press the ▼ key.
FRAME EXEC PROG.
Version:
1.41
4.2.7 Recalling Files
Press RECALL to recall files from 1 to 101. Files 1 to 100 are user data. File 101 is
factory set state. After a file is recalled, the display will go to the mode editor for you to
edit or view the file. When you press RECALL, the display will show the file number
last recalled. The default file number is 2 when the mainframe is powered on
Press RECALL, 3, then ENTER to recall the number 3.
RECALL FILE
3
FILE NO:
The data of all channels will be recalled when you execute file recall.
4.2.8 Saving Files
There are 100 file locations (1 to 100) for you to save files.
ENTER to save a file to location 20.
Press SAVE, 2, 0, then
SAVE FILE
FILE NO: 20
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4.2.9 Saving Defaults
Press SAVE, and the ▼ key until the display shows as follows. The DEFAULT states
are used for electronic Load after power-on. Press 1 to save DEFAULT to EEPROM.
SAVE DEFAULT
1:YES 2:NO
4.2.10 Saving Programs
Press SAVE, and the ▼ key until the display shows as follows.
program.
Press 1 to save
SAVE PROGRAM
1:YES 2:NO
4.2.11 Going To Local
The SHIFT key operates as a local key, LCL when electronic Load is in remote mode.
You can press the LCL key to go to local operation when Load is in remote state. In
local operation, SHIFT operates as the shift key.
4.2.12 Lock Operation
The lock operation disables any setting for change. When data are locked, no settings
can change. The operation of ON/OFF and SPEC keys will not be affected by lock
function. Press SHIFT and “.” simultaneously to enable/disable lock function. This is
a toggle key to enable/disable lock function.
4.2.13 Setting System and RS-232C Connection
The parameters of RS-232C are set in the system. There are three parameters for
you to set:: Baud Rate, Parity Check, and Data Bit number. Press SHIFT and 0
simultaneously to set system data.
Baud Rate : 0:600, 1:1200, 2:2400, 3:4800, 4:9600 bits/second.
Parity Check : 0:EVEN, 1:ODD, 2:NONE.
Data Bit
: 0:7 bits, 1:8 bits.
The RS-232C connector on the rear panel of Mainframe is a 9-pin connector (DB-9,
male connector). The RS-232C connector bus signal is defined as follows.
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Local Operation
PIN NO.
1
2
3
4
5
6
7
8
9
INPUT/OUTPUT
Output
Input
Output
Output
Output
Input
NC
NC
NC
DESCRIPTION
+5V
R×D
T×D
DTR
GND
DSR
—
—
—
NOTE: Pin 1 (+5V) is for MML series Remote Controller only.
Table 4-2 RS-232C Connector
4.2.14 Connecting the GO/NG Output Port
The GO/NG output port on the rear panel of Mainframe is a 15-pin connector (DB-15,
female connector). The GO/NG signals are TTL active low to indicate NG. They are
defined as follows.
PIN NO.
1
3
5
7
9
11
13
15
8
CHANNEL NO.
1
2
3
4
5
6
7
8
Enable
DESCRIPTION
H:PASS or SPEC. OFF, L:FAIL
H:PASS or SPEC. OFF, L:FAIL
H:PASS or SPEC. OFF, L:FAIL
H:PASS or SPEC. OFF, L:FAIL
H:PASS or SPEC. OFF, L:FAIL
H:PASS or SPEC. OFF, L:FAIL
H:PASS or SPEC. OFF, L:FAIL
H:PASS or SPEC. OFF, L:FAIL
H:SPEC. OFF, L:SPEC. ON
NOTE: Pin 2, 4, 6, 10, 12, 14 are connected to GND.
Table 4-3 GO/NG Output Port Connector
4.2.15 Setting the GPIB Address
GPIB address displays after RS-232C parameters in the system.
feature to check GPIB address.
You can use this
GPIB ADDRESS 1
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4.3
Local Operation of Load Module
There are two kinds of panels in Load module. One is a single channel/module panel.
The other is a double channels/module panel. There are four keys for each of the
module panels. Only one key is different from these keypads. Figure 4-6 shows the
single channel/module front panel.
4.3.1
Local Operation of Single Channel/Module (Panel A)
Figure 4-6 Single Channel/Module (Panel A)
c 7-segment LED Display. Displays the measurement Voltage and Current.
Each display has five digits.
d 7-segment Display Unit Indicators. Indicates the 7-segment display
measurement unit V and I.
e Operation Mode and GO/NG indicators. Indicates the operation modes of CC,
CR, CV, and GO/NG in the Load module. GO/NG LED indicator has two color.
The green LED is on for GO (pass) while the red for NG (fail). The GO/NG LED is
off when SPEC test is OFF.
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Local Operation
f Keypad Indicators. The four LEDs indicate the keypad status. Each LED
shows the key status under the LED.
status.
Refer to the next paragraph for LED on/off
g Keypad. There are four keys for you to select/control the operation of Load
module. The A/B key is used to select static load level. Its LED will be on when
the Load is in level1(A) state and off when in level2(B) state or others. The A/B
key can be used to select Fix mode for rotary knob setting too. Please refer to
4.3.3.
The STATIC/DYNA key selects STATIC/DYNAmic mode. Its LED will be on when
the Load is in DYNAmic mode. DYNAmic operation is only effective in CC mode.
In other modes, this key has no response.
The SHORT key enables Load to simulate short function. Its LED will be on when
the short function of Load is enabled. It operates only when the Load input is
enabled. It will not respond if Load input is not enabled.
The LOAD key controls the on/off of the Load module input.
when the Load input is enabled.
Its LED will be on
h Vsense Connectors. These two connectors are Vsense measurement input.
Refer to 2.5.2 for remote sense connections.
i Rotary Knob. The knob changes the level when the Load input is enabled.
Rotating the knob clockwise will increase level whereas counterclockwise decrease
level. When you change Load level with the knob, the setting of Mainframe will
not change. The changed Load level will hold unless the same setting is changed
on Mainframe.
j Load Terminals. They are input connectors of the Load for connecting to the
UUT. Each of them carries a maximum of 40 Amps. If the current is over 40
Amps, you must connect two or more terminals for load connection. The PLUS (+)
must be connected to the high potential of UUT. Refer to 2.5.1 for load input
connection.
4-19
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Examples
The following examples illustrate how to operate the module in CC mode.
1. Select Level1 (A) and Level2 (B)
There are two levels of each mode for you to select in static function. The level1 (A)
and level2 (B) can be selected through A/B key. Press A/B key to select current level1
or level2. When level1 (A) is selected, the LED of A/B key will be active. Press this
key again to select level2 (B), and the LED will be inactive.
2. Select Dynamic Function
There are two functions for CC mode: STATIC and DYNAmic. The two functions can
be selected through STATIC/DYNA key. Press STATIC/DYNA key to select Dynamic
function. Press this key again to select static function. When Dynamic function is
selected, the LED of DYNA will be active.
3. Short the Load Input
The Load can simulate a short circuit across the input. The short circuit will be
enabled when SHORT is pressed, and Load input is active (on). If the input is shorted,
the LED of short will be active. The SHORT key can be set in configuration of toggled
on/off mode, or active by pressing mode.
4. Load Input On/Off
The input can be toggled on or off by pressing LOAD.
the LED of load will be active.
When the input is turned on,
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Local Operation
4.3.2
Local Operation of Double Channels/Module (Panel B)
Figure 4-7 Double Channels/Module (Panel B)
The double channels/module means that there are two channels for one module.
Each channel of module is isolated from the other. One set of display/keypad for the
module can control both channels. The left channel is called channel L while the right
one channel R. The 7-segment LED displays one or two channel status. The keypad
and rotary knob can control both channels through R/L key.
c 7-segment LED Display. Displays measurement V/I of single or double channels.
Each display has five digits.
d Channel LED Indicators. There are two LEDs to indicate the active right and/or
left channel(s) of the Load module. When the LED of channel R is on, the
7-segment display, mode, GO/NG indicators, and keypad are active on channel R.
Channel L functions the same as channel R when its LED indicator is on.
When the indicators of channel R and L are on, the 7-segment display selectively
shows both channels’ V or I. The indicators and STATIC/DYNA, SHORT, and
LOAD keys in operation mode will be disabled when both channels are selected.
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e 7-segment Display Unit Indicators. Indicate the 7-segment display
measurement unit V and/or I.
f Operation Mode and GO/NG Indicators. When the LED of channel R or L is on,
the operation and GO/NG LED have the same function as single channel/module.
When the LEDs of channel R and L are on, the LED of operation mode indicators
will be disabled (off). The GO/NG LED will be red when the check of any channel
SPEC fails. It will be green when the check of both channels SPEC is all right.
g Keypad Indicators. There are three LEDs indicating the keypad status. Each
LED shows the key status. It has the same function as single channel/module.
The LED of LOAD will be active when any input of channel L or R is on.
h Keypad. There are four keys for you to select/control the operation of Load
module. The R/L key is used to select the display of 7-segment LED, and the
indicators of channel R and/or L. The R/L key can be used to select Fix mode for
rotary knob setting too. Please refer to 4.3.3.
i Vsense Connectors. These four connectors are for Vsense measurement input.
The two connectors on the right are for right channel while those on the left for left
channel. Refer to 2.5.2 for remote sensing connections.
j Rotary Knob. The knob has the same function as single channel/module when
channel R or L is selected.
will be disabled.
If the indicators of channel R and L are on, the knob
k Load Terminals. They are input connectors of the Load for connecting to the
UUT. The two terminals on the left are for input of left channel while those on the
right for that of right channel. The PLUS (+) sign of the input of each channel
must connect the high potential. Refer to 2.5.1 for load input connections.
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Local Operation
Examples
The following examples illustrate how to select the double channels/module in CC
mode.
There are two channels/modules, so you have to select right or left channel for display
and keypad. When channel R and L are selected, only the R/L key is enabled; other
keys are disabled. During power-on, the preselected channel is channel L. It means
that the 7-segment display, indicators, and keypad are active at channel L. The double
channels/module has the same function as single channel/module. However, level 2(B)
cannot be selected.
1. The display sequence of R/L key is channel L -> channel R -> channels L+R
display V -> channels L+R I back to channel L.
2. Select Dynamic Function
The static and dynamic function can be selected through the STATIC/DYNA key. Press
this key to select Dynamic function, and press again to select static function. When
Dynamic function is selected, the LED of DYNAmic will be active.
3. Short the Load Input
The Load can simulate a short circuit across the input. The short circuit can be
enabled when SHORT is pressed, and Load input is active. When the input is shorted,
the LED of short will be active. The SHORT key can be set in configuration of toggled
on/off mode, or active by pressing mode.
4. Load Input On/Off
The input can be toggled on or off by pressing LOAD.
the LED of LOAD will be active.
When the input is turned on,
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4.3.3 Online Change Level
The Load module provides you with two ways of online change level. They are
convenient for you to change the load directly with the rotary knob in LOADON. These
two operation modes are described below.
Ratio Mode: In LOADON change load with the rotary knob.
When the rotary knob rotates clockwise, it means as follows.
CC mode: raise the current value.
CR mode: raise the resistance value.
CV mode: raise the voltage value.
When the rotary knob rotates counterclockwise, it means as follows.
CC mode: lower the current value.
CR mode: lower the resistance value.
CV mode: lower the voltage value.
The modulation is dependent on the rotating speed of the rotary knob.
Fixed Mode: In LOADON press the A/B key (single channel/module) or the R/L key
(double channel/module) for at least 2.5 seconds to access this operation
mode. Now V and I will be displayed in fixed positions in this mode.
Press the A/B, R/L, or STATIC/DYNA key to shift a digit left or right. The
resolution nearest that digit will begin to change. The changed digit will
be displayed glisteningly, and modulated by the rotary knob. To exit from
this mode, press the A/B or R/L key for at least 2.5 seconds.
NOTE: The value of mainframe setting will not be changed if the setting is changed by
the rotary knob. Therefore, when you change the value of setting with the rotary knob,
the value of load module setting and that of mainframe setting will not be the same.
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5 REMOTE OPERATION
5.1 Introduction
This section describes how to program the MML series electronic load remotely from a
GPIB controller or RS232C. The command set introduced here can be applied to all
electronic loads of the MML series, including MML-80-20-102 and MML-80-60-301,
equipped with optional GPIB cards or standard equipment, RS232C.
Either GPIB or RS232C can be used at one time; they cannot be used simultaneously.
If GPIB is used first in remote control, RS232C will be disabled until the unit has been
reset, and vice versa.
5.2 DIP Switches on the GPIB Card
5.2.1
GPIB Address
Each device connected to the GPIB interface is assigned a unique address to allow
communication with the system controller. Before programming the electronic load
remotely via a GPIB computer, you need to know the GPIB address.
Setting the GPIB address of an individual mainframe is done with an 8-bit DIP switch on
a GPIB card at its rear panel. The five bits from A1 to A5 are GPIB address bits which
provide addressing space from 0 to 30. For details, please refer to Figure 5-1 and
Table 5-1.
ON
A8: SHIELD GND
A7: MASTER/SLAVE
A6: PON-SRQ
A1
A2
A3
A4
A5
Figure 5-1 GPIB DIP Switch
5-1
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Address
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A5 A4 A3 A2 A1
0 0 0 0 0
0 0 0 0 1
0 0 0 1 0
0 0 0 1 1
0 0 1 0 0
0 0 1 0 1
0 0 1 1 0
0 0 1 1 1
0 1 0 0 0
0 1 0 0 1
0 1 0 1 0
0 1 0 1 1
0 1 1 0 0
0 1 1 0 1
0 1 1 1 0
0 1 1 1 1
Address
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
A5 A4 A3 A2 A1
1 0 0 0 0
1 0 0 0 1
1 0 0 1 0
1 0 0 1 1
1 0 1 0 0
1 0 1 0 1
1 0 1 1 0
1 0 1 1 1
1 1 0 0 0
1 1 0 0 1
1 1 0 1 0
1 1 0 1 1
1 1 1 0 0
1 1 1 0 1
1 1 1 1 0
Table 5-1 GPIB Addresses
5.2.2
Other DIP Switches
The remaining bits on the DIP switch, A6-A8, preset the electronic load mainframe to
the following functions:
Bit
A6
Meaning
Frame LOAD ON Link
A7
A8
SHIELD GND
Preset
Description
OFF
When ON is set, two frames can act as
LOAD Key ON/OFF through RS232C port.
OFF
It must be OFF.
OFF
It is the selection for enabling shield ground.
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Remote Operation
5.3 GPIB Capability of the Electronic Load
GPIB
Capability
Response
Interface
Functions
Talker/
Listener
All electronic load functions except for setting the GPIB AH1, SH1,
T6, L4
address are programmable over the GPIB. The electronic load can send and receive messages over the
GPIB. Status information is sent using a serial poll.
Service
Request
The electronic load will set the SRQ line true if there is
an enabled service request condition.
Remote/
Local
In local mode, the electronic load is controlled from the RL1
front panel but will also execute commands sent over
the GPIB. The electronic load powers up in local mode
and remains there until it receives a command over the
GPIB. Once the electronic load is in remote mode,
REMOTE appears on the front panel LCD, all front
panel keys except LCL are disabled, and the load
module display is in normal metering mode. Pressing
the LCL key on the front panel returns the electronic
load to local mode. Local can be disabled using local
lockout, so only the controller or the power switch can
return the electronic load to local mode.
Device
Clear
The electronic load responds to the Device Clear (DCL) DCL, SDC
and Selected Device Clear (SDC) interface commands.
These cause the electronic load to clear any activity
that may prevent it from receiving and executing a
new command. DCL and SDC do not change any
programmed settings.
SR1
5.4 RS232C in Remote Control
To enable remote control operation, send the command CONFigure: REMote ON. To
return to local operation, send the command CONFigure: REMote OFF.
Terminate the RS232C command string with <nl>. Its ASCII code is hexadecimal 0A
(or decimal 10). The control commands for RS232C are the same as those for GPIB.
5-3
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5.5 Basic Programming Definitions
GPIB statements include instrument control and query commands. A command
statement sends an instruction to the electronic load, and a query command requests
information from the electronic load.
Simple Command
The simplest command statement consists of a command or keyword usually followed
by a parameter or data:
LOAD ON
or TRIG
Compound Command
When two or more keywords are connected by colons (:), it creates a compound
command statement. The last keyword usually is followed by a parameter or data:
CURRent: STATic: L1 3
or CONFigure: VOLTage: RANGe H
Query Command
A simple query command consists of a keyword followed by a question mark:
MEASure: VOLTage?
MEASure: CURRent?
or CHAN?
Forms of Keywords
Every keyword has two forms:
Long-Form. The word is spelled out completely to identify its function.
For instance, CURRENT, VOLTAGE, and MEASURE are long-form keywords.
Short-Form. The word contains only the first three or four letters of the long-form.
For instance, CURR, VOLT, and MEAS are short-form keywords.
In keyword definitions and diagrams, the short-form part of each keyword is emphasized
in UPPER-CASE letters to help you remember it. However, the electronic load will
accept Volt, volt, voltage, VOLTAGE, volTAGE, etc. without regard to which form you
apply. If the keyword is incomplete, for example, “VOL” or “curre”, it will not be
recognized.
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Remote Operation
5.6 Numerical Data Formats
The Sorensen MML Series electronic load accepts the numerical data types listed in
Table 5-2.
Symbol
Description
Example
NR1
Digits with no decimal point. The decimal point 123, 0123
is assumed to be to the right of the leastsignificant digit.
NR2
Digits with a decimal point.
123., 12.3, 0.123, .123
NR3
Digit with a decimal point and an exponent.
1.23E+3, 1.23E-3
NRf
Flexible decimal form that includes NR1 or
NR2 or NR3.
123, 12.3, 1.23E+3
NRf+
Expanded decimal form that includes NRf and
MIN, MAX. MIN and MAX are the minimum
and maximum limit values for the parameter.
123, 12.3, 1.23E+3,
MIN, MAX
Table 5-2 Numerical Data Type
Numerical data may be followed by a suffix that dimensions the data. A suffix may be
preceded by a multiplier. The MML Series device makes use of the suffixes listed in
Table 5-3 and multipliers listed in Table 5-4.
Mode
Class
Preferred Suffix Secondary Suffix Referenced Unit
CC
Current
A
CR
Resistance
OHM
Ohm
CV
Amplitude
V
Volt
All
Time
S
Second
Millisecond
Ampere
MS
All
Slew Rate
Amperes/Microsecond
A/µS
Table 5-3 Suffix Elements
Multiplier
Mnemonic
Definition
1E6
MA
mega
1E3
K
kilo
1E-3
M
milli
1E-6
U
micro
1E-9
N
nano
Table 5-4 Suffix Multipliers
5-5
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5.7 Character Data Formats
For command statements, the <NRf+> data format permits entry of required characters.
For query statements, character strings may be returned in either of the forms shown in
the following table. It depends on the length of the returned string.
Symbol
Character Form
crd
Character Response Data. They permit the return up to 12 characters.
aard
Arbitrary ASCII Response Data. They permit the return of undelimited
7-bit ASCII. This data type is an implied message terminator (refer to
“Separators and Terminators”).
5.8 Separators and Terminators
In addition to keywords and parameters, GPIB program statements require the following
Data Separators:
Data must be separated from the previous command keyword by a space. This
is shown in examples as a space (CURR 3) and on diagrams by the letters SP
inside a circle.
Keyword Separators:
Keywords (or headers) are separated by a colon (:), a semicolon(;), or both.
For example:
LOAD:SHOR ON
MEAS:CURR?;VOLT?
CURR:STAT:L1 3;:VOLT:L1 5
Program Line Separators:
A terminator informs GPIB that it has reached the end of a statement. Normally, this is
sent automatically by your GPIB programming statements.
The termination also occurs with other terminator codes, such as EOI. In this manual,
the terminator is assumed at the end of each example line of code. If it needs to be
indicated, it is shown by the symbol <nl>, which stands for “new line” and represents the
ASCII coded byte 0A hexadecimal (or 10 decimal).
5-6
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Remote Operation
Traversing the Command Tree:
•
The colon (:) separates keywords from each other and represents
changes in branch level to the next lower one. For example:
CONF:VOLT:ON 5
CONF is a root-level command, VOLT is the first branch, and ON is the
second branch. Each colon moves down command interpretation to the
next branch.
•
The semicolon (;) allows you to combine command statements into one
line. It returns the command interpretation to the previous colon. For
example, you can combine the following two command statements:
RES:RISE 100 <nl> and
RES:L1 400 <nl>
to form one command line as follows:
RES:RISE 100;L1 400 <nl>
•
To return to the root-level form you can:
Enter a new-line character. This is symbolized by “<nl>” and can be
linefeed “LF” or end-of-line “EOL.”
or
Enter a semicolon followed by a colon (;:).
Note the following examples:
1. (root):VOLT:L1: 30<nl>
Starting a New Line returns to the Root.
2. (root):SPEC:VOLT:H 30;
:L 5;:
3. (root):RES:L1 400;
:RISE 1000;:
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5.9 Language Dictionary
Commands for remote operation of the Electronic Load are grouped into subsystems.
Subsystems are arranged in alphabetic order; commands within each subsystem are
listed alphabetically. A syntax chart of the subsystem, which includes the commands
belonging to the same group, is given.
5.9.1
Common Commands
Common commands defined by the IEEE488.2 standard are generic commands and
queries. The first part of the language dictionary covers these commands. Each of them
has a leading “*”.
¡F
*CLS
*ESE
SP
<NRf>
SP
<NRf>
*SAV
SP
<NRf>
*SRE
SP
<NRf>
*ESE?
*ESR?
*IDN?
*OPC
*OPC?
*RCL
*RDT?
*RST
*SRE?
*STB?
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Remote Operation
*CLS Clear Status Command
Type:
Device Status
Description:
The *CLS command executes the following actions:
1. Clear these registers
Syntax:
Parameters:
•
Channel Status Event registers for all channels
•
Channel Summary Event register
•
Questionable Status Event register
•
Standard Event Status Event register
• Operation Status Event register
2. Clear the Error Queue
3. If “Clear Status Command” immediately follows a program
message terminator (<nl>), the “Output Queue” and the MAV
bit are also cleared.
*CLS
nil
*ESE Standard Event Status Enable Command/Query
Type:
Device Status
Description:
This command sets the condition of the Standard Event Status
Enable register, which determines which events of the Standard
Event Status Event register (see *ESR?are allowed to set the ESB
(Event Summary Bit) of the Status Byte register. A "1" in the bit
position enables the corresponding event. All of the enable
events of the Standard Event Status Event register are logically
ORed to cause the ESB (bit 5) of the Status Byte register to be
set. See description of all three registers in Chapter 4, Status
Reporting.
Syntax:
*ESE <NRf>
Parameters:
0 to 255
Example:
*ESE 48
This command enables the CME and EXE events
of the Standard Event Status Event register.
Query Syntax:
*ESE?
Return Parameters: <NR1>
Query Example:
*ESE?
This query returns current setting of "Standard
Event Status Enable".
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*ESR? Standard Event Status Register Query
Type:
Device Status
Description:
This query reads the Standard Event Status register. Reading the
register clears it. See detailed explanation of this register in
Chapter 4, Status Reporting.
Standard Event Status Event Register
Bit Position
7
6
5
4
3
2
Condition
0
0
CME EXE DDE QYE
Bit Weight
128
64
32
16
8
4
Query Syntax:
*ESR?
Return Parameters: <NR1>
Query Example:
*ESR?
Return Example:
1
0
2
0
0
1
Returns status readings of Standard Event Status
register.
48
*IDN? Identification Query
Type:
System Interface
Description:
This query requests the Electronic Frame (MML-4) to identify
itself.
Query Syntax:
*IDN?
Return Parameters: <aard>
Query Example:
*IDN?
String Information
Sorensen
Manufacturer
MML-4
Model
0
Always return zero
01.xx
Revision level of the primary interference firmware
0
Customer’s version
Return Example:
Sorensen MML-4,0,01.xx,0
*OPC Operation Complete Command
Type:
Device Status
Description:
This command causes the interface to set the OPC bit (bit 0) of
the Standard Event Status register when the Electronic Frame
(MML-4) has completed all pending operations.
Syntax:
*OPC
Parameters:
nil
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Remote Operation
*OPC? Operation Complete Query
Type:
Device Status
Description:
This query returns an ASCII “1” when all pending operations are
completed.
Query Syntax:
*OPC?
Return Parameters: <NR1>
Query Example:
1
*RCL Recall Instrument State Command
Type:
Device Status
Description:
This command restores the electronic load to a state that was
previously stored in memory with the *SAV command to the
specified location (see *SAV).
Syntax:
*RCL <NRf>
Parameters:
1 to 101
Example:
*RCL 50
*RDT? Resource Description Transfer Query
Type:
System Interface
Description:
This command returns the types of Electronic Frame (MML-4). If
channel does not exist, it returns 0. If channel exists, it returns the
types such as MML-80-20-102.
Query Syntax:
*RDT?
Return Parameters: <aard>
Query Example:
80802, 80802, 80802, 80802, 80802, 80802, 80802, 80802.
*RST Reset Command
Type:
Device State
Description:
This command forces an ABORt, *CLS, LOAD=PROT=CLE
command.
Syntax:
*RST
Parameters:
nil
*SAV Save Command
Type:
Device Status
Description:
This command stores the present state of the single electronic
load and the states of all channels of the multiple loads in a
specified location in memory.
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Syntax:
Parameters:
Example:
*SAV <NRf>
1 to 100
*SAV 50
*SRE Service Request Enable Command/Query
Type:
Device Status
Description:
This command sets the condition of the Service Request Enable
register, which determines which events of the Status Byte
register (see *STB) are allowed to set the MSS (Master Status
Summary) bit. A "1" in the bit position enable bits are logically
ORed to cause Bit 6 (the Master Summary Status Bit) of the
Status Byte register to be set. See details concerning the Status
Byte register in Chapter 4. Status Reporting.
Syntax:
Parameters:
Example:
*SRE <NRf>
0 to 255
*SRE 20
Query Syntax:
*SRE?
Return Parameters: <NR1>
Query Example:
*SRE?
Enables the CSUM and MAV bit of the
Service Request Enable.
Returns current setting for "Service
Request Enable".
*STB? Read Status Byte Query
Type:
Device Status
Description:
This query reads the Status Byte register. Note that the MSS
(Master Summary Status) bit instead of RQS bit is returned in Bit
6. This bit indicates if the electronic load has at least one reason
for requesting service. *STB? does not clear the Status Byte
register, which is cleared only when subsequent action has
cleared all its set bits. Refer to Chapter 4, Status Reporting for
more information about this register.
Status Byte Register
Bit Position
7
6
5
4
3
2
Condition
0
MSS ESB MAV QUES CSUM
Bit Weight
128
64
32
16
8
4
Query Syntax:
Return Parameters:
Query Example:
Return Example:
*STB?
<NR1>
*STB?
20
1
0
2
0
0
1
Returns the contents of "Status Byte."
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Remote Operation
5.10 Specific Commands
The MML series products are equipped with the following specific GPIB commands.
5.10.1 ABORT Subsystem
$%25W
ABORt
Type:
Description:
Syntax:
All Channel
Sets all electronic loads as "OFF".
ABORt
5.10.2 CHANNEL Subsystem
:CHANnel
:LOAD
<NRf+>
SP
<NR1>
?
MAX
SP
MIN
:SYNCon
ON/1
SP
OFF/0
?
:ACTive
<NR1>
ON/1
SP
OFF/0
:ID
?
<aard>
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CHANnel:[LOAD]
Type:
Description:
Channel Specific
Selects a specific channel by which the coming channel-specific
command will be received and executed.
Syntax:
CHANnel <NRf+>
Parameters:
1~8
Example:
CHAN 1
Sets specific channel as "1".
CHAN MAX
Sets specific channel as "8".
CHAN MIN
Sets specific channel as "1".
Query Syntax:
CHAN?
CHAN? MAX
CHAN? MIN
Return Parameters: <NR1>
Query Example:
CHAN?
Returns current specific channel.
Return Example:
1
CHANnel:ACTive
Type:
Description:
Syntax:
Parameter:
Example:
Channel Specific
Enables or disables the load module.
CHANnel : ACTive ON. Enable the load module. The front panel
displays the measurement of voltage
and current.
CHANnel : ACTive OFF. Disable the load module. LCD on the
front panel displays OFF.
ON/1, OFF/0
CHAN : ACT ON
CHANnel:SYNCon
Type:
Channel Specific
Description:
Sets the load module to receive synchronized command action of
RUN ABORT or not.
Syntax:
CHANnel : SYNCon ON
CHANnel : SYNCon OFF
Parameters:
ON/1, OFF/0
Example:
CHAN : SYNC ON.
Sets the load module to receive
synchronized command action.
CHAN : SYNC OFF.
Sets the load module not to receive
synchronized command action.
Query Syntax:
CHAN : SYNC?
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Remote Operation
Return Parameters: <NR1>
Query Example:
CHAN : SYNC?
Return Example:
Returns to the load module and makes it
receive synchronized command status.
The load module does not receive
synchronized command status.
The load module receives synchronized
command status.
0
1
CHAN:ID?
Type:
Description:
Channel-specific
After going to a module, this query requests the module to identify
itself.
Query Syntax:
ID?
Return Parameters: <aard>
Query Example:
ID?
String
Information
Sorensen
Manufacturer
80202
Model (2 x 100W module)
0
Always return zero
01.08
Revision of the primary interface firmware
0
Customer’s Version
Return Example:
Sorensen,80202,0,01.08,0
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5.10.3 CONFIGURE Subsystem
:CONFigure
:VOLTage
:ON
<NRf>
SP
<NR2>
?
:RANGe
<NRf>
SP
suffix
suffix
H
L
<NR2>
?
:LATCh
ON/1
SP
OFF/0
<NR1>
?
:AUTO
:LOAD
ON/1
SP
OFF/0
<NR1>
?
:MODE
LOAD/1
SP
PROGRAM/0
<NR1>
?
:SOUNd
SP
ON/1
OFF/0
<NR1>
?
:REMote
SP
ON/1
OFF/0
:SAVE
:LOAD
SP
UPDATED/1
OLD/0
?
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Remote Operation
CONFigure:VOLTage:ON
Type:
Channel-specific
Description:
Sets voltage of sink current on.
Syntax:
CONFigure:VOLTage:ON <NRf> [suffix]
Parameters:
For valid voltage range, refer to respective specification.
Example:
CONF:VOLT:ON 1
Sets Von=1V.
CONF:VOLT:ON 300mV Sets Von=300mV.
Query Syntax:
CONFigure:VOLTage:ON?
Return Parameters: <NR2> [Unit=Voltage]
Query Example:
CONF:VOLT:ON?
Returns setting Von value.
Return Example:
3.5
CONFigure:VOLTage:RANGe
Type:
Channel-specific
Description:
Sets voltage measurement range in CC mode.
Syntax:
CONFigure:VOLTage:RANGEe <NRf> [suffix]
Parameters:
Value ranges depend on Load Module. For details, refer to
specification.
Example:
CONF:VOLT:RANG 16 Sets full-range as Low, for example, in
MML-80V-60A-301.
CONF:VOLT:RANG 80V Sets full-range as High, for example, in
MML-80V-60A-301.
CONF:VOLT:RANG H Sets full-range as High.
CONF:VOLT:RANG L
Sets full-range as Low.
Query Syntax:
CONFigure:VOLTage:RANGe?
Return Parameters: <NR2> [Unit = Voltage]
Query Example:
CONF:VOLT:RANG?
Returns Voltage range.
Return Example:
16
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CONFigure:VOLTage:LATCh
Type:
Channel-specific
Description:
Sets the action type of Von.
Syntax:
CONFigure:VOLTage:LATch ON
CONFigure:VOLTage:LATch OFF
Parameters:
ON/1, OFF/0
Example:
CONF:VOLT:LAT ON
Sets the action type of Von as Latch.
CONF:VOLT:LAT OFF
Sets the action type of Von as Non
Latch (for details, see Section 4).
Query Syntax:
CONFigure:VOLTage:LATch?
Return Parameters: <NR1>
Query Example:
CONF:VOLT:LAT?
Return Example:
0 (non latch), 1 (latch)
Returns the action type of Von.
CONFigure:AUTO:LOAD
Type:
All Channel
Description:
Sets if the load module will do Auto Load On during power-on.
Syntax:
CONFigure:AUTO:LOAD ON
CONFigure:AUTO:LOAD OFF
Parameters:
ON/1, OFF/0
Example:
CONF:AUTO:LOAD ON Starts Auto Load On during power-on.
CONF:AUTO:LOAD OFF Closes Auto Load On during power-on.
Query Syntax:
CONFigure:AUTO:LOAD?
Return Parameters: <NR1>
Query Example:
CONF:AUTO:LOAD?
Return Example:
0 or 1 Returns the status of Auto Load On
CONFigure:AUTO:MODE
Type:
All Channel
Description:
Sets type of Auto Load On as LOAD ON or PROGRAM RUN.
Syntax:
CONFigure:AUTO:MODE LOAD
CONFigure:AUTO:MODE PROGRAM
Parameters:
LOAD/1, PROGRAM/0
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Remote Operation
Example:
CONF:AUTO:MODE LOAD
CONF:AUTO:MODE PROGRAM
Query Syntax:
Return Parameters:
Query Example:
Return Example:
Sets Auto Load On as
general LOAD ON.
Sets Auto Load On as
PROGRAM RUN.
CONFigure:AUTO:MODE?
<NR1>
CONF:AUTO:MODE?
Returns the execution
0 or 1 type of Auto Load On.
CONFigure:SOUND
Type:
Channel-specific
Description:
Sets the buffer sound of the load module as ON/OFF.
Syntax:
CONFigure:SOUND ON
CONFigure:SOUND OFF
Parameters:
ON/1, OFF/0
Example:
CONF:SOUND ON
CONF:SOUND OFF
Query Syntax:
CONFigure:SOUND?
Return Parameters: <NR1>
Query Example:
CONF:SOUND?
Returns the control status of the load
module’s buzzer sound.
Return Example:
0 or 1
CONFigure:REMote
Type:
All Channel
Description:
Sets the status of remote control (only effective in RS232C).
Syntax:
CONFigure:REMote ON
CONFigure:REMote OFF
Parameters:
ON/1, OFF/0
Example:
CONF:REM ON
Sets as remote control.
CONFigure:SAVE
Type:
Description:
Syntax:
Parameters:
Example:
All Channel
Stores the data of CONFigure into EEPROM.
CONFigure:SAVE
none
CONF:SAVE
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CONFigure:LOAD
Type:
Description:
All Channel
The value at the setting of load module as LOADON is the one
changed by the rotary knob (UPDATED/1) or the original set value
(OLD/0).
Syntax:
CONFigure:LOAD UPDATED
CONFigure:LOAD OLD
Parameters:
UPDATED/1, OLD/0
Example:
CONF:LOAD UPDATED Sets the value of LOADON as that
changed by the rotary knob.
CONF:LOAD OLD
Sets the value of LOADON as the
original set value.
Query Syntax:
CONFigure:LOAD?
Return Parameters: <NR1>
Query Example:
CONF:LOAD?
Return Example:
1 (UPDATED) or 0 (OLD)
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Remote Operation
5.10.4 CURRENT Subsystem
:CURRent
:STATic
:L1
SP
<NRf+>
:L2
suffix
<NR2>
?
MAX
SP
MIN
:RISE
SP
:FALL
?
<NRf+>
suffix
<NR2>
MAX
SP
MIN
:DYNamic
:L1
SP
<NRf+>
:L2
suffix
<NR2>
?
MAX
SP
MIN
:RISE
SP
:FALL
?
<NRf+>
suffix
<NR2>
MAX
SP
MIN
:T1
SP
:T2
?
<NRf+>
suffix
<NR2>
SP
MAX
MIN
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CURRent:STATic:L1/L2
Type:
Channel-specific
Description:
Sets Static Load Current of constant current mode.
Syntax:
CURRent:STATic:L1
<NRf+> [suffix]
CURRent:STATic:L2
<NRf+> [suffix]
Parameters:
For valid value range, refer to respective specification.
Example:
CURR:STAT:L1 20
Sets Constant Current = 20A for Static
Load L1.
CURR:STAT:L2 10
Sets Constant Current = 10A for Static
Load L2.
CURR:STAT:L1 MAX
Sets Constant Current = maximum
value for Static Load L1.
CURR:STAT:L2 MIN
Sets Constant Current = minimum value
for Static Load L2.
Query Syntax:
CURRent:STATic:L1?
CURRent:STATic:L2?
CURRent:STATic:L1? MAX
CURRent:STATic:L2? MIN
Return Parameters: <NR2> [Unit=Ampere]
Query Example:
CURR:STAT:L1?
Returns set current value of the Static
Load L1.
Return Example:
3.12
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Remote Operation
CURRent:STATic:RISE/FALL
Type:
Channel-specific
Description:
Sets current slew rate of constant current static mode.
Syntax:
CURRent:STATic:RISE <NRf+> [suffix]
CURRent:STATic:FALL <NRf+> [suffix]
Parameters:
For valid value range, refer to respective specification.
Example:
Query Syntax:
CURR:STAT:RISE 2.5
Sets rise slew rate as 2.5A/µS of
static load.
CURR:STAT:FALL 1A/µS
Sets fall slew rate as 1A/µS of static
load.
CURRent:STATic:RISE?
CURRent:STATic:FALL?
CURRent:STATic:RISE? MAX
CURRent:STATic:FALL? MIN
Return Parameters: <NR2> [Unit=A/µS]
Query Example:
CURR:STAT:RISE?
Return Example:
2.5
Returns rise slew rate of static load.
CURRent:DYNamic:L1/L2
Type:
Channel-specific
Description:
Sets Dynamic Load Current during constant current mode.
Syntax:
CURRent:DYNamic:L1
<NRf+> [suffix]
CURRent:DYNamic:L2
<NRf+> [suffix]
Parameters:
For valid value range, refer to respective specification.
Example:
CURR:DYN:L1 20
Sets dynamic load parameter L1 = 20A.
CURR:DYN:L2 10
Sets dynamic load parameter L2 = 10A.
CURR:DYN:L1 MAX
Sets dynamic load parameter L1 =
maximum value.
CURR:DYN:L2 MIN
Sets dynamic load parameter L2 =
minimum value.
Query Syntax:
CURRent:DYNamic:L1?
CURRent:DYNamic:L2?
CURRent:DYNamic:L1? MAX
CURRent:DYNamic:L2? MIN
Return Parameters: <NR2> [Unit=Ampere]
Query Example:
CURR:DYN:L1?
Returns setting current in dynamic load
L1.
Return Example:
35.6
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CURRent:DYNamic:RISE/FALL
Type:
Channel-specific
Description:
Sets current slew rate of constant current dynamic mode.
Syntax:
CURRent:DYNamic:RISE
<NRf+>
[suffix]
CURRent:DYNamic:FALL <NRf+>
[suffix]
Parameters:
For valid value range, refer to respective specification.
Example:
CURR:DYN:RISE 2.5
Sets rise slew rate as 2.5A/µS.
CURR:DYN:FALL 1A/µS Sets fall slew rate as 1A/µS.
CURR:DYN:RISE MAX Sets rise slew rate as maximum value of
dynamic load.
CURR:DYN:FALL MIN Sets fall slew rate as minimum value of
dynamic load.
Query Syntax:
CURRent:DYNamic:RISE?
CURRent:DYNamic:FALL?
CURRent:DYNamic:RISE? MAX
CURRent:DYNamic:FALL? MIN
Return Parameters: <NR2> [Unit=A/µS]
Query Example:
CURR:DYN:RISE?
Returns rise slew rate of dynamic load.
Return Example:
2.5
CURRent:DYNamic:T1/T2
Type:
Channel-specific
Description:
Sets duration parameter T1 or T2 of dynamic load.
Syntax:
CURRent:DYNamic:T1 <NRf+> [suffix]
CURRent:DYNamic:T2 <NRf+> [suffix]
Parameters:
For valid value range, refer to respective specification.
Example:
CURR:DYN:T1 10mS
Sets dynamic duration T1 = 10mS.
CURR:DYN:T2 2S
Sets dynamic duration T2 = 2S.
CURR:DYN:T1 MAX
Sets dynamic duration T1 as maximum
value.
CURR:DYN:T2 MIN
Sets dynamic duration T2 as minimum
value.
Query Syntax:
CURRent:DYNamic:T1?
CURRent:DYNamic:T2?
CURRent:DYNamic:T1? MAX
CURRent:DYNamic:T2? MIN
Return Parameters: <NR2> [Unit=Sec]
Query Example:
CURR:DYN:T1?
Returns the dynamic duration parameter T1.
Return Example:
0.15
5-24
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Remote Operation
5.10.5 FETCH Subsystem
:FETCh
:VOLTage
?
:CURRent
?
:STATus
?
:ALLVoltage
?
:ALLCurrent
?
<NR2>
<NR2>
<NR1>
<aard>
<aard>
FETCh:VOLTage?
Type:
Description:
Channel-specific
Returns real time voltage measured at the input of the load
module.
Query Syntax:
FETCh:VOLTage?
Return Parameters: <NR2> [Unit=Voltage]
Query Example:
FETC:VOLT?
Return Example:
8.12
FETCh:CURRent?
Type:
Description:
Channel-specific
Returns real time current measured at the input of the load
module.
Query Syntax:
FETCh:CURRent?
Return Parameters: <NR2> [Unit=Amper]
Query Example:
FETC:CURR?
Return Example:
3.15
FETCh:STATus?
Type:
Description:
Query Syntax:
Return Parameters:
Channel-specific
Returns real time status of the load module.
FETCh:STATus?
<NR1>
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FETCh:ALLVoltage?
Type:
Channel-independent
Description:
Returns real time voltage measured at the input of the all load
module.
Query Syntax:
FETCh:ALLVoltage?
Return Parameters: <aard> [Unit=Voltage]
Query Example:
FETC:ALLV?
Return Example:
1.2, 2, 0, 0, 10.2, 0, 0, 0
FETCh:ALLCurrent?
Type:
Channel-independent
Description:
Returns real time current measured at the input of the all load
module.
Query Syntax:
FETCh:ALLCurrent?
Return Parameters: <aard> [Unit=Amper]
Query Example:
FETC:ALLC?
Return Example:
0, 0, 0, 0, 5.12, 0, 12, 0
Bit Position
Condition
Bit Weight
15 14 13 12 11 10
Query Example:
FETC:STAT?
Return Example:
4
9
8
7
6
5
4
3
2
1
0
OT RV OP OV OC
16 8
4
2
1
Reads back the present status of load
module.
5-26
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Remote Operation
5.10.6 LOAD Subsystem
:LOAD
:STATe
ON/1
SP
OFF/0
<NR1>
?
:SHORt
:STATe
SP
ON/1
OFF/0
?
:KEY
SP
<NR1>
TOGGLE/1
HOLD/0
?
:PROTection
<NR1>
:CLEar
?
<NR1>
LOAD:[STATe]
Type:
Description:
Channel-specific
The LOAD command makes the electronic load active/on or
inactive/off.
Syntax:
LOAD:[STATe] ON
LOAD:[STATe] OFF
Parameters:
ON/1, OFF/0
Example:
LOAD ON
Activates the electronic load.
LOAD OFF
Inactivates the electronic load.
Query Syntax:
LOAD:[STATe]?
Return Parameters: <NR1>
Query Example:
LOAD?
Returns if the electronic load is active.
Return Example:
1
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LOAD:SHORt:[STATe]
Type:
Channel-specific
Description:
Activate or inactivate short-circuited simulation.
Syntax:
LOAD:SHORt:[STATe]
Example:
LOAD:SHOR ON
Activates short-circuited simulation.
LOAD:SHOR OFF
Inactivates short-circuited simulation.
Parameters:
ON/1, OFF/0
Query Syntax:
LOAD:SHORt:[STATe]?
Return Parameters: <NR1>
Query Example:
LOAD:SHOR?
Returns the short-circuited simulation
state.
Return Example:
1
LOAD:SHORt:KEY
Type:
Description:
Syntax:
Parameters:
Example:
Channel-specific
Sets the mode of short key in the electronic load.
LOAD:SHORt:KEY TOGGLE
TOGGLE/1, HOLD/0
LOAD:SHOR:KEY TOGGLE Sets short key mode as Toggle.
LOAD:SHOR:KEY HOLD
Sets short key mode as Hold.
Query Syntax:
LOAD:SHORt:KEY?
Return Parameters: <NR1>
Query Example:
LOAD:SHOR:KEY?
Returns the mode of short key in the
electronic load.
Return Example:
1
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Remote Operation
LOAD:PROTection:CLEar
Type:
Channel-specific
Description:
This command resets or returns status of the electronic load.
Syntax:
LOAD:PROTection:CLEar
Parameters:
For valid value range, refer to respective specification.
Example:
LOAD:PROT:CLE
Query Syntax:
LOAD:PROTection:CLEar?
Return Parameters: <NR1>
Bit Position
Condition
Bit Weight
15 14 13 12 11 10
0 0 0 0 0 0
Query Example:
Return Example:
LOAD:PROT?
0
9
0
8
0
7
0
6
0
5
0
4
3
2
1
0
OT RV OP OV OC
16 8
4
2
1
Returns status of the electronic load.
5.10.7 MEASURE Subsystem
:MEASure
:VOLTage
?
:CURRent
?
:INPut
SP
<NR2>
<NR2>
UUT/1
LOAD/0
?
:SCAN
SP
<NR1>
ON/1
OFF/0
?
:ALLVoltage
?
:ALLCurrent
?
<arrd>
<arrd>
5-29
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MEASure:VOLTage?
Type:
Channel-specific
Description:
Returns voltage measured at the input of the electronic load.
Query Syntax:
MEASure:VOLTage?
Return Parameters: <NR2> [Unit=Voltge]
Query Example:
MEAS:VOLT?
Return Example:
8.12
MEASure:CURRent?
Type:
Channel-specific
Description:
Returns current measured at the input of the electronic load.
Query Syntax:
MEASure:CURRent?
Return Parameters: <NR2> [Unit=Amper]
Query Example:
MEAS:CURR?
Return Example:
3.15
MEASure:INPut
Type:
Description:
Syntax:
Parameters:
Example:
Channel-specific
Selects the input port of the electronic load to measure voltage.
MEASure:INPut?
UUT/1, LOAD/0
MEAS:INP UUT
MEAS:INP LOAD
Query Syntax:
MEASure:INPut?
Returns the input port which has been
set.
Return Parameters: <NR1>
Query Example:
MEAS:INP?
Return Example:
0
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Remote Operation
MEASure:SCAN
Type:
Description:
Syntax:
All Channel
Sets the scanning mode of frame to load module.
MEASure:SCAN ON
Enables the frame to scan the load
module.
MEASure:SCAN OFF
Disables the frame to scan the load
module.
Parameters:
ON/1, OFF/0
Example:
MEAS:SCAN ON
MEAS:SCAN OFF
Query Syntax:
MEASure:SCAN?
Returns the scanning mode of the
frame.
Return Parameters: <NR1>
Query Example:
MEAS:SCAN?
Return Example:
1
MEASure:ALLVoltage?
Type:
Channel-independent
Description:
Returns voltage measured at the input of the all load module.
Query Syntax:
MEASure:ALLVoltage?
Return Parameters: <aard> [Unit=Voltage]
Query Example:
MEAS:ALLV?
Return Example:
1.2, 2, 0, 0, 10.2, 0, 0, 0
MEASure:ALLCurrent?
Type:
Channel-independent
Description:
Returns current measured at the input of the all load module.
Query Syntax:
MEASure:ALLCurrent?
Return Parameters: <aard> [Unit=Amper]
Query Example:
MEAS:ALLC?
Return Example:
0, 0, 0, 0, 5.12, 0, 12, 0
5-31
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Sorensen MML Series Operation and Programming Manual
5.10.8 MODE Subsystem
:MODE
SP
CCL
CCH
CCDL
CCDH
CRL
CRH
CV
?
<aard>
MODE
Type:
Description:
Syntax:
Channel-specific
This command sets operational modes of the electronic load.
MODE CCL
Sets CC mode of low range.
MODE CCH
Sets CC mode of high range.
MODE CCDL
Sets CC dynamic mode of low range.
MODE CCDH
Sets CC dynamic mode of high range.
MODE CRL
Sets CR mode of low range.
MODE CRH
Sets CR mode of high range.
MODE CV
Sets CV mode.
Parameters:
CCL, CCH, CCDL, CCDH, CRL, CRH, CV
Example:
MODE CCL
Query Syntax:
MODE?
Returns the operational mode of the
electronic load.
Return Parameters: <aard>
Query Example:
MODE?
Return Example:
CCL
5-32
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Remote Operation
5.10.9 PROGRAM Subsystem
:PRORGram
:FILE
<NRf+>
SP
<NR1>
?
:SEQuence
<NRf+>
SP
<NR1>
?
:SHORt
:CHANnel
:TIME
:MODE
SP
<NRf>
?
<NR1>
SP
<NRf>
?
<NR2>
SKIP
SP
AUTO
MANUAL
<CHAR>
?
:ACTive
<NRf>
SP
<NR1>
?
:CHAin
<NRf>
SP
<NR1>
?
:ONTime
SP
<NRf>
suffix
<NR2>
?
MAX
SP
MIN
:OFFTime
SP
<NRf>
suffix
<NR2>
?
SP
MAX
MIN
:RUN
SP
ON/1
OFF/0
:SAVE
5-33
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PROGram:FILE
Type:
Description:
Syntax:
Parameters:
Example:
Query Syntax:
Return Parameters:
Query Example:
Return Example:
By program file
Sets the program number.
PROGram:FILE <NRf+>
1 to 10
PROG:FILE 10
PROGram:FILE?
Returns the active program number.
<NR1>
PROG:FILE?
10
PROGram:SEQuency
Type:
By program file
Description:
Sets the sequency of program file.
Syntax:
PROGram:SEQuency <NRf+>
Parameters:
1 to 10
Example:
PROG:SEQ3
Query Syntax:
PROGram:SEQuency?
Return Parameters: <NR1>
Query Example:
PROG:SEQ?
Return Example:
3
PROGram:SEQuency:MODE
Type:
By program file
Description:
Sets the type of sequency.
Syntax:
PROGram:SEQuency:MODE SKIP
PROGram:SEQuency:MODE AUTO
PROGram:SEQuency:MODE MANUAL
Parameters:
SKIP, AUTO, MANUAL
Example:
PROG:SEQ:MODE SKIP
PROG:SEQ:MODE AUTO
PROG:SEQ:MODE MANUAL
Query Syntax:
PROGram:SEQ:MODE?
Return Parameters: SKIP, AUTO, MANUAL
Query Example:
PROG:SEQ:MODE?
Return Example:
AUTO
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Remote Operation
PROGram:SEQuency:SHORt:CHANnel
Type:
By program file
Description:
Sets the short channel of PROGRAM file SEQuency
Syntax:
PROGram:SEQuency:SHORt:CHANnel <NRf>
Parameters:
0 - 255
Channel
Bit Weight
Example:
Query Syntax:
Return Parameter:
Query Example:
Return Example:
8
128
7
64
6
32
5
16
4
8
3
4
2
2
1
1
PROG:SEQ:SHOR:CHAN 3
PROGram:SEQuency:SHORt:CHANnel?
<NR1>
PROG:SEQ:SHOR:CHAN?
3
PROGram:SEQuency:SHORt:TIME
Type:
By program file
Description:
Sets the short time of PROGRAM file SEQuency.
Syntax:
PROGram:SEQuency:SHORt:TIME
Parameters:
0 - 30.0
Example:
PROG:SEQ:SHOR: TIME 10
Query Syntax:
PROGram:SEQuency:SHORt:TIME?
Return Parameter: <NR2>
Query Example:
PROG:SEQ:SHOR:TIME?
Return Example:
10
PROGram:ACTive
Type:
Description:
Syntax:
Parameters:
By program file
Selects the active load modules.
PROGram:ACTive <NRf>
0 - 255
Channel
Bit Weight
Example:
Query Syntax:
Return Parameters:
Query Example:
Return Example:
8
128
7
64
6
32
5
16
4
8
3
4
2
2
1
1
PROG:ACT 12
PROGram:ACTive?
<NR1>
PROG:ACT?
12
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PROGram:CHAin
Type:
Description:
Syntax:
Parameters:
Example:
Query Syntax:
Return Parameters:
Query Example:
Return Example:
By program file
Sets the type of program file in serial execution.
PROGram:CHAin <NRf>
0 to 10
0 does not chain.
PROG:CHA 7
PROGram:CHAin?
<NR1>
PROG:CHA?
7
PROGram:ONTime
Type:
Description:
Syntax:
Parameters:
Example:
By program file
Sets the load on time of program file.
PROGram:ONTime <NRf>
For valid value range, refer to respective sepcification.
PROG:ONT 10
PROG:ONT 100mS
Query Syntax:
PROGram:ONTime?
Return Parameters: <NR2> [Unit=Sec]
Query Example:
PROG:ONT?
Return Example:
10
PROGram:OFFTime
Type:
By program file
Description:
Sets the load off time of program file.
Syntax:
PROGram:OFFTime <NRf>
Parameters:
For valid value range, refer to respective sepcification.
Example:
PROG:OFFT 20
PROG:OFFT 200mS
Query Syntax:
PROGram:OFFTime?
Return Parameters: <NR2> [Unit=Sec]
Query Example:
PROG:OFFT?
Return Example:
0.2
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Remote Operation
PROGram:RUN
Type:
Description:
Syntax:
Parameters:
Example:
By program file
Executes program run according to the set program file.
PROGram:RUN ON
PROGram:RUN OFF
ON/1, OFF/0
PROG:RUN ON
PROGram:SAVE
Type:
Description:
Syntax:
Parameters:
Example:
By program file
Saves the setting of program.
PROGram:SAVE
NONE
PROG:SAVE
5.10.10
RESISTANCE Subsystem
:RESistance
:L1
SP
:L2
?
<NRf+>
suffix
<NR2>
SP
MAX
MIN
:RISE
SP
:FALL
?
<NRf+>
suffix
<NR2>
SP
MAX
MIN
RESistance:L1/L2
Type:
Description:
Syntax:
Parameters:
Channel-specific
Sets static resistance level of constant resistance mode.
RESistance:L1 <NRf+> [suffix]
RESistance:L2 <NRf+> [suffix]
For valid value range, refer to respective specification.
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Example:
RES:L1 20 OHM
RES:L2 10 OHM
RES:L1 MAX
RES:L2 MIN
RESistance:L1?
RESistance:L2?
RESistance:L1? MAX
RESistance:L2? MIN
Return Parameters: <NR2> [Unit=OHM]
Query Example:
RES:L1?
Sets constant resistance = 20 ohm for
Load L1.
Sets constant resistance = 10 ohm for
Load L2.
Sets constant resistance = maximum L1
value for Load L1.
Sets constant resistance = minimum L2
value for Load L2.
Query Syntax:
Return Example:
Returns the set resistance of the value
of Load L1.
10
RESistance:RISE/FALL
Type:
Channel-specific
Description:
Sets resistive slew rate of constant resistance.
Syntax:
RESistance:RISE
<NRf+> [suffix]
RESistance:FALL
<NRf+> [suffix]
Parameters:
For valid value range, refer to respective specification.
Example:
RES:RISE 2.5
Sets CR rise slew rate as 2.5A/µS.
RES:FALL 1A/µS
RES:RISE MAX
Sets CR fall slew rate as 1A/µS.
Sets CR rise slew rate as the maximum
programmable value.
Sets CR fall slew rate as the minimum
programmable value.
RES:FALL MIN
Query Syntax:
RESistance:RISE?
RESistance:FALL?
RESistance:RISE? MAX
RESistance:FALL? MIN
Return Parameters: <NR2> [Unit=OHM]
Query Example:
RES:RISE?
Returns CR rise slew rate.
Return Example:
2.5
5-38
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Remote Operation
5.10.11
RUN Subsystem
:RUN
Type:
Description:
Syntax:
5.10.12
All Channel
Sets all electronic loads as “ON”.
RUN
SHOW Subsystem
:SHOW
:DISPlay
SP
L
R
LRV
LRI
SHOW:DISPlay
Type:
Description:
Syntax:
Parameters:
Example:
Channel-specific (Double Channel Module Only)
Sets the display mode of the electronic load.
SHOW:DISPlay L
SHOW:DISPlay R
SHOW:DISPlay LRV
SHOW:DISPlay LRI
L, R, LRV, LRI.
SHOW:DISP L
Displays the voltage and current values
of channel L.
SHOW:DISP R
Displays the voltage and current values
of channel R.
SHOW:DISP LRV
Displays the voltage value of channel L
and channel R.
SHOW:DISP LRI
Displays the current value of channel L
and channel R.
5-39
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5.10.13
SPECIFICATION Subsystem
:SPECification
:UNIT
VALUE/1
SP
PERCENT/0
<NR1>
?
:PASS
:VOLTage
?
<NR1>
:CURRent
<NR1>
?
:VOLTage
:H
SP
<NRf>
suffix
:L
:CURRent
:C
:TEST
<NR2>
?
ON/1
SP
OFF/0
?
<NR1>
SPECification:UNIT
Type:
All Channel
Description:
Sets the specific entry mode.
Syntax:
SPECification:UNIT VALUE
SPECification:UNIT PERCENT
Parameters:
VALUE/1, PERCENT/0
Example:
SPEC:UNIT VALUE
SPEC: UNIT PERCENT
Query Syntax:
SPECification:UNIT?
Query Example:
SPEC:UNIT?
Return Parameters: <NR1>
Return Example:
0
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SPECification:VOLTage?
Type:
Channel-specific
Description:
Requests GO-NG result reference to voltage specification.
Query Syntax:
SPECification:VOLTage?
Query Example:
SPEC:VOLT?
Returns voltage GO-NG result to CC
and CR modes.
Return Parameters: <NR1>
Return Example:
0 (NG), 1 (GO)
SPECification:CURRent?
Type:
Channel-specific
Description:
Requests GO-NG result reference to current specification.
Query Syntax:
SPECification:CURRent?
Query Example:
SPEC:CURR?
Returns current GO-NG result to CC
mode.
Return Parameters: <NR1>
Return Example:
0 (NG), 1 (GO)
SPECification?
Type:
Description:
Query Syntax:
Query Example:
Return Parameters:
Return Example:
All Channel
Requests GO-NG result reference to all channel specification.
SPECification?
SPEC?
Returns all channel GO-NG result.
<NR1>
0 (NG), 1 (GO)
SPECification:VOLTage
Type:
Channel-specific
Description:
Sets the voltage specification.
Syntax:
SPECification:VOLTage:H
SPECification:VOLTage:L
SPECification:VOLTage:C
Parameters:
For valid value range, refer to respective specification.
Example:
SPEC:VOLT:H <NRf+> [suffix]
SPEC:VOLT:L <NRf+> [suffix]
SPEC:VOLT:C <NRf+> [suffix]
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Query Syntax:
SPECification:VOLTage:H?
SPECification:VOLTage:L?
SPECification:VOLTage:C?
Query Example:
SPEC:VOLT:H?
Return Parameters: <NR2> [Unit=Voltage]
Return Example:
4.75
SPECification:CURRent
Type:
Channel-specific
Description:
Sets the current specification.
Syntax:
SPECification:CURRent:H
SPECification:CURRent:L
SPECification:CURRent:C
Parameters:
For valid value range, refer to respective specification.
Example:
SPEC:CURR:H <NRf+> [suffix]
SPEC:CURR:L <NRf+> [suffix]
SPEC:CURR:C <NRf+> [suffix]
Query Syntax:
SPECification:CURR:H?
SPECification:CURR:L?
SPECification:CURR:C?
Query Example:
SPEC:CURR:H?
Return Parameters: <NR2> [Unit=Current]
Return Example:
4.75
SPECification:TEST
Type:
Channel-specific
Description:
Starts or closes the specification test.
Syntax:
SPECification:TEST ON
SPECification:TEST OFF
Parameters:
ON/1, OFF/0
Example:
SPEC:TEST ON
SPEC: TEST OFF
Query Syntax:
SPECification:TEST?
Query Example:
SPEC:TEST?
Return Parameters: <NR1>
Return Example:
1
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Remote Operation
5.10.14
:STATus
STATUS Subsystem
:CHANnel
:CONDition
?
:ENABle
SP
<NR1>
?
:CSUMmary
:EVENt
?
:NTRansition
SP
:PTRansition
?
:ENABle
SP
<NR1>
<NR1>
?
:QUEStionable
:EVENt
?
:CONDition
?
:ENABle
SP
<NR1>
?
:EVENt
?
:NTRansition
SP
:PTRansition
?
<NR1>
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STATus:CHANnel:CONDition
Type:
Channel-specific
Description:
Returns real time channel status.
Query Syntax:
STATus:CHANnel:CONDition?
Return Parameters: <NR1>
Bit Configuration of Channel Status Register
Bit Position
Condition
Bit Weight
Query Example:
Return Example:
15 14 13 12 11 10 9
0 0 0 0 0 0 0
STAT:CHAN:COND?
2048
8
0
7
0
6
0
5 4
3
2
1
0
0 OT RV OP OV OC
16 8
4
2
1
Returns status of the electronic load.
STATus:CHANnel:ENABle
Type:
Channel-specific
Description:
Masks for selecting which bits in the Event register are allowed to
be summed into the corresponding channel bit of the Channel
Summary Event register.
Syntax:
STATus:CHANnel:ENABle
Parameters:
0 ~ 65535
Example:
STAT:CHAN:ENABl 24
Query Syntax:
STATus:CHANnel:ENABle
Return Parameters: <NR1>
Query Example:
STAT:CHAN:ENABL?
Returns the contents of the Status
Channel Enable register.
Return Example:
24
STATus:CHANnel:EVENt?
Type:
Channel-specific
Description:
Records all channel events that have occurred since last time the
register was read, and resets the Channel Event register.
Query Syntax:
STATus:CHANnel:EVENt?
Return Parameters: <NR1>
Query Example:
STAT:CHAN:EVEN?
Reads and resets Channel Event
register.
Return Example:
24
5-44
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STATus:CHANnel:PTRansition/NTRansition
Type:
Channel-specific
Description:
Programmable filters that determine what type of transition (0 to 1
or 1 to 0) in the Condition register will set the corresponding bit of
the Event register.
Syntax:
STATus:CHANnel:PTRansition/NTRansition <NRf>
Parameters:
0 ~ 65535
Example:
STAT:CHAN:PTR 4
Sets OP (over power bit 2) as 0 to 1.
STAT:CHAN:NTR 4
Sets OP (over power bit 2) as 1 to 0.
Query Syntax:
STATus:CHANnel:PTRansition?
STATus:CHANnel:NTRansition?
Return Parameters: <NR1>
Query Example:
STAT:CHAN:PTR?
Inquires setting of Channel PTRansition.
Return Example:
4
STATus:CSUMmary:ENABle
Type:
Channel-specific
Description:
Masks for selecting which bits in the Channel Event register are
allowed to be summed into the CSUM (Channel Summary) bit of
the Status Byte register.
Syntax:
STATus:CSUMmary:ENABle
Parameters:
Bit Configuration of Channel Summary Register
Bit Position
Channel
Bit Weight
Example:
Query Syntax:
Return Parameters:
Query Example:
Return Example:
7
8
128
6
7
64
5
6
32
4
5
16
3
4
8
2
3
4
1
2
2
0
1
1
STAT:CSUM:ENAB 3
STATus:CSUMmary:ENABle?
<NR1>
STAT:CSUM:ENAB?
Returns the setting of Channel
Summary Enable register.
3
5-45
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STATus:CSUMmary:EVENt
Type:
Channel-specific
Description:
Indicates all channels on which an enable STAT:CHAN Event has
occurred since last time the register was read.
Syntax:
STATus:CSUMmary:EVENt
Parameters:
Bit Configuration of Channel Summary Register
Bit Position
Channel
Bit Weight
Example:
Query Syntax:
Return Parameters:
Query Example:
Return Example:
7
8
128
6
7
64
5
6
32
4
5
16
3
4
8
2
3
4
1
2
2
0
1
1
STAT:CSUM:EVEN 3
STATus:CSUMmary:EVENt?
<NR1>
STAT:CSUM:EVEN?
Returns the value of the Channel
Summary Event register.
3
STATus:QUEStionable:CONDition
Type:
Channel-specific
Description:
Real-time recording of Questionable data
Query Syntax:
STATus:QUEStionable:CONDition?
Return Parameters: <NR1>
Query Example:
STAT:QUES:COND?
Returns the channel status.
Return Example:
6
STATus:QUEStionable:ENABle
Type:
Channel-specific
Description:
Masks for selecting which bits on the Event register are allowed to
be summed into the QUES bit of the Status Byte register.
Syntax:
STATus:QUEStionable:ENABle
Parameters :
Bit Configuration of Questionable Status Register
Bit Position
Condition
Bit Weight
15 14 13 12 11 10
0
0
0
0
0
0
9
0
8
0
7
0
6
0
5
0
4
3
2
1
0
TE RV PE VE CE
16 8
4
2
1
5-46
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Remote Operation
Example:
Query Syntax:
Return Parameters:
Query Example:
Return Example:
STAT:QUES:ENAB 24
STATus:QUEStionable:ENABle?
<NR1>
STAT:QUES:ENAB
Returns the setting of the Status
Questionable Enable register.
24
STATus:QUEStionable:EVENt?
Type:
Channel-specific
Description:
Records all Questionable conditions that have occurred since last
time the register was read.
Query Syntax:
STATus:QUEStionable:EVENt?
Return Parameters: <NR1>
Query Example:
STAT:QUES:EVEN?
Returns the contents of the
Questionable Event register.
Return Example:
24
STATus:QUEStionable:PTRansition/NTRansition
Type:
Channel-specific
Description:
Programmable filters determine what type of transition (0 to 1 or
1 to 0) in the Condition register will set the corresponding bit of the
Event register.
Syntax:
STATus:QUEStionable:PTRansition/NTRansition <NRf>
Parameters:
0 ~ 65535
Example:
STAT:QUES:PTR 4
Sets OP (over power bit 2) as 0 to 1.
STAT:QUES:NTR 4
Sets OP (over power bit 2) as 1 to 0.
Query Syntax:
STATus:QUEStionable:PTRansition?
STATus:QUEStionable:NTRansition?
Return Parameters: <NR1>
Query Example:
STAT:QUES:PTR?
Returns the setting on the
QUEStionable Ptransition/Ntransition.
Return Example:
4
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Sorensen MML Series Operation and Programming Manual
5.10.15
VOLTAGE Subsystem
:VOLTage
:L1
SP
:L2
?
<NRf+>
suffix
<NR2>
SP
MAX
MIN
:CURRent
SP
<NRf+>
suffix
<NR2>
?
MAX
SP
MIN
:MODE
SP
FAST/1
SLOW/0
?
VOLTage:L1/L2
Type:
Description:
Syntax:
Parameters:
Example:
Query Syntax:
<NR1>
Channel-specific
Sets voltage of static load during constant voltage mode.
VOLTage:L1
VOLTage:L2
For valid value range, refer to respective specification.
VOLT:L1 8V
Sets voltage of load L1 as 8V.
VOLT:L2 24V
Sets voltage of load L2 as 24V.
VOLT:L1 MAX
Sets voltage of load L1 as the maximum
value.
VOLT:L2 MIN
Sets voltage of load L2 as the minimum
value.
VOLTage:L1?
VOLTage:L2?
VOLTage:L1? MAX
VOLT:L2? MIN
5-48
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Remote Operation
Return Parameters: <NR2> [Unit=Voltage]
Query Example:
VOLT:L1?
Return Example:
0
Returns the set voltage value of load L1.
VOLTage:CURRent
Type:
Description:
Syntax:
Parameters:
Example:
Channel-specific
Sets the current limit of constant voltage mode.
VOLTage:CURRent
For valid value range, refer to respective specification.
VOLT:CURR 3
Sets loading current limit as 3A during
constant voltage mode.
VOLT:CURR MAX
Sets loading current limit as the
maximum value during constant voltage
mode.
VOLT:CURR MIN
Sets loading current limit as the
minimum value during constant voltage
mode.
Query Syntax:
VOLTage:CURRent?
Return Parameters: <NR2> [Unit=Amper]
Query Example:
VOLT:CURR?
Return Example:
3
VOLTage:MODE
Type:
Description:
Syntax:
Channel-specific
Sets the response speed of CV mode.
VOLTage:MODE FAST
VOLTage:MODE SLOW
Parameters:
FAST/1, SLOW/0
Example:
VOLT: MODE FAST
VOLT:MODE SLOW
Query Syntax:
VOLTage:MODE?
Return Parameters: <NR1>
Query Example:
VOLT:MODE?
Return Example:
0
5-49
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Sorensen MML Series Operation and Programming Manual
5.11 Status Reporting
5.11.1 Introduction
This section discusses the status data structure of the MML series electronic load as
shown in Figure 5-2. The standard registers, such as the Event Status register group,
the Output Queue, the Status Byte and Service Request Enable registers perform
standard GPIB functions and are defined in IEEE-488.2 Standard Digital Interface for
Programmable Instrumentation. Other status register groups implement the specific
status reporting requirements of the electronic load. The Channel Status and Channel
Summary groups are used by multiple channel of electronic load to enable status
information to be kept at its own Status register of each channel.
5.11.2 Register Information in Common
Condition Register
The condition register represents the present status of electronic load signals. Reading
the condition register does not change the state of its bits. Only changes in electronic
load conditions affect the contents of this register.
PTR/NTR Filter, Event Register
The Event register captures changes in conditions corresponding to condition bits in a
condition register, or to a specific condition in the electronic load. An event becomes
true when the associated condition makes one of the following electronic load-defined
transitions:
Positive TRansition (0 to 1)
Negative TRansition (1 to 0)
Positive or Negative TRansition (0 to 1 or 1 to 0)
The PTR/NTR filters determine what type of condition transitions sets the bits in the
Event register. Channel Status and Questionable Status allow transitions to be
programmed. Other register groups, i.e., Channel Summary, Standard Event Status
register group use an implied Rise (0 to 1) condition transition to set bits in the Event
register. Reading an Event register clears the register (all bits are set to zero).
Enable Register
The Enable register can be programmed to enable which bit in the corresponding Event
register is logically-ORed into the Channel Summary bit.
5-50
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CHANNEL STATUS (ONE CHANNEL)
CONDITION
PTR/NTR
EVENT
ENABLE
CHANNEL SUMMARY
1
2
4
8
16
1
2
4
8
16
1
2
4
8
16
EVENT
CHAN 1
CHAN 2
CHAN 3
CHAN 4
CHAN 5
CHAN 6
CHAN 7
CHAN 8
0
1
2
3
4
5
6
7
ENABLE
1
2
4
8
16
32
64
128
2
4
8
16
32
64
128
LOGICAL OR
1
2
4
8
16
LOGICAL OR
OC
0
OV
1
OP
2
RV
3
OT
4
N.U. 5-15
QUESTIONABLE STATUS
CONDITION
STANDARD EVENT
QYE
2
DDE
EXE
CME
N.U.
N.U.
3
4
5
6
7
1
2
4
8
16
EVENT
1
2
4
8
16
1
2
4
8
16
ENABLE
1
2
4
8
16
ENABLE
1
1
4
8
16
32
4
8
16
32
OUTPUT QUEUE
DATA
DATA
DATA
SERVICE
REQUEST
GENERATION
STATUS
BYTE
N.U.
N.U.
CSUM
QUES
MAV
ESB
MSS
N.U.
0
1
2
3
4
5
6
7
4
8
16
32
64
SERVICE
REQUEST
GENERATION
4
8
16
32
LOGICAL OR
0
1
CE
0
OV
1
PE
2
RV
3
TE
4
N.U. 5-15
PTR/NTR
STATUS
LOGICAL OR
EVENT
OPC
N.U.
LOGICAL OR
FROM CHAN 2
FROM CHAN 3
FROM CHAN 4
FROM CHAN 5
FROM CHAN 6
FROM CHAN 7
FROM CHAN 8
LOGICAL OR
FROM CHAN 1
Figure 5-2 Status Registers of Electronic Load
5-51
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Mnemonic Bit Value
Meaning
OC
0
1
Overcurrent. When an overcurrent condition has
occurred on a channel, Bit 0 is set and remains set
until the overcurrent condition is removed and
LOAD:PROT:CLE is programmed.
OV
1
2
Overvoltage. When an overvoltage condition has
occurred on a channel, Bit 1 is set and remains set
until the overvoltage condition is removed and
LOAD:PROT:CLE is programmed.
OP
2
4
Overpower. An overpower condition has occurred
on a channel, Bit 2 is set and remains set until the
overpower condition is removed and LOAD:PROT:CLE
is programmed.
RV
3
8
Reverse voltage on input. When a channel has a
reverse voltage applied to it, Bit 3 is set. It remains
set until the reverse voltage is removed and
LOAD:PROT:CLE is programmed.
OT
4
16
Overtemperature. When an overtemperature condition
has occurred on a channel, Bit 4 is set and the channel
is turned off. It remains set until the channel has
cooled down well below the overtemperature trip point
and LOAD:PROT:CLE is programmed.
Table 5-5 Bit Description of Channel Status
5.11.3 Channel Status
The Channel Status register offers you one or more channel status conditions, which
indicate certain errors or faults have occurred on specific channel. Table 5-5 describes
the channel status conditions that are applied to the electronic load.
When the bits of the Channel Status Condition register are set, the corresponding
condition is true.
Program the PTR/NTR filter to select which way of a condition transition on a bit in the
Channel Status Condition register will set the corresponding bit in the Event registers.
Reading of the Channel Status Event register resets itself to zero.
The Channel Status Enable register can be programmed to specify which channel
status event bit is logically-ORed to become the corresponding channel bit in the
Channel Summary Event register.
5-52
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5.11.4 Channel Summary
The Channel Summary registers summarize the channel status conditions of up to 8
channels.
When an enabled bit in the Channel Status Event register is set, it causes the
corresponding channel bit in the Channel Summary Event register to be set.
Reading of the Event register will reset it to zero.
The Channel Summary Enable register can be programmed to specify which channel
summary event bit from the existing channels is logically-ORed to become Bit 2 (CSUM
bit) in the Status Byte register.
5.11.5 Questionable Status
The Questionable Status registers offer you one or more questionable status conditions,
which indicate certain errors or faults have occurred on at least one channel. Table 5-6
lists the questionable status conditions that are applied to the electronic load. These
conditions are the same as the channel status conditions. Refer to Table 5-5 for a
complete description.
When the corresponding bit of the Questionable Status Condition register is set, the
indicated condition is true.
Program the PTR/NTR filter to select which way of a condition transition on a bit in the
Questionable Status Condition register will set the corresponding bit in the Event
registers. Reading the Questionable Status Event register will reset it to zero.
The Questionable Status Enable register can be programmed to specify which questionable status event bit is logically-ORed to become Bit 3 (QUES bit) in the Status Byte
register.
Mnemonic
Bit
Value
Meaning
CE/OC
0
1
Current Error (Overcurrent)
OV
1
2
Overvoltage
PE/OP
2
4
Power Error (Overpower)
RV
3
8
Reverse voltage on input
TE/OT
4
16
Temperature Error (Overtemperature)
Table 5-6 Bit Description of Questionable Status
5-53
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5.11.6 Output Queue
The Output Queue stores output messages sequentially on a FIFO (First-In, First-Out)
basis until they are read from the electronic load. When there are data in the queue, it
sets it to 4 (MAV bit) in the Status Byte register.
5.11.7 Standard Event Status
All programming errors that have occurred will set one or more of the error bits in the
Standard Event Status register. Table 5-7 describes the standard events that apply to
the electronic load. Reading of the Standard Event Status register will reset it to zero.
The Standard Event Enable register can be programmed to specify which standard
event bit is logically-ORed to become Bit 5 (ESB bit) in the Status Byte register.
Mnemonic
Bit Value
Meaning
OPC
0
1
Operation Complete. This event bit is a response to
the *OPC command. It indicates that the device has
completed all selected pending operations.
QYE
2
4
Query Error. The output queue was read when no
data were present or the data in the queue were lost.
DDE
3
8
Device Dependent Error. Memory was lost, or selftest failed.
EXE
4
16
Execution Error. A command parameter was outside
the legal range or inconsistent with the electronic
load’s operation, or the command could not be
executed due to some operating condition.
CME
5
32
Command Error. A syntax or semantic error has
occurred, or the electronic load has received a
<GET> within a program message.
Table 5-7 Bit Description of Standard Event Status
5-54
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5.11.8 Status Byte Register
The Status Byte register summarizes all of the status events from all status registers.
Table 5-8 describes the status events that are applied to the electronic load.
The Status Byte register can be read with a serial poll or *STB? query. The RQS bit is
the only bit that is automatically cleared after a serial poll.
When the Status Byte register is read with a *STB? query, bit 6 of the Status Byte
register will contain the MSS bit. The MSS bit indicates that the load has at least one
reason for requesting service. *STB? does not affect the status byte.
The Status Byte register is cleared by *CLS command.
Mnemonic
Bit Value
Meaning
CSUM
2
4
Channel Summary. Indicates if an enabled channel
event has occurred. It is affected by Channel
Condition, Channel Event and Channel Summary
Event registers.
QUES
3
8
Questionable. Indicates if an enabled questionable
event has occurred.
MAV
4
16
Message Available. Indicates if the Output Queue
contains data.
ESB
5
32
Event Status Bit. Indicates if an enabled standard
event has occurred.
RQS/MSS
6
64
Request Service/Master Summary Status. During a
serial poll, RQS is returned and cleared. For an *STB?
query, MSS is returned without being cleared.
Table 5-8 Bit Description of Status Byte
5.11.9 Service Request Enable Register
The Service Request Enable register can be programmed to specify which bit in the
Status Byte register will generate service requests.
5-55
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6 PROGRAMMING EXAMPLE
This section provides a basic example of controlling the electronic load via GPIB. The
GPIB used here is made by National Instruments.
#include “dec1.h”
#include
#include
#include
#include
#include
<stdio.h>
<stdlib.h>
<sring.h>
<iostream.h>
<time.h>
static int MTA,
MLA;
static int bd;
const char LA = 0x20,
TA = 0x40;
static void setNi( int pad, char *cardName )
{
MTA = TA + pad;
MLA = LA + pad;
if ( (bd = ibfind ( cardName ) ) < 0 ) {
puts ( “GPIB Card Found Error” );
exit ( 1 );
}
if ( ibpad ( bd, pad ) & ERR ) {
puts ( “GPIB Card Address Assignment Error” );
exit ( 3 );
}
ibtmo ( bd, 10 );
ibsic ( bd );
ibsre ( bd, 1 );
}
static void Niwrite( int pad, char *cmdStr )
{
char cmd[4];
cmd[0] = UNL;
cmd[1] = UNT;
cmd[2] = MTA;
cmd[3] = LA + pad;
//
ibcmd( bd, cmd, 4 );
ibwrt ( bd, cmdStr, _fstrlen( cmdStr ) );
ibcmd( bd, cmd, 2 );
6-1
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Sorensen MML Series Operation and Programming Manual
}
static char rxBuf[ 64 ]
static void Niread( int pad, char *queryStr )
{
char cmd[ 4 ];
Niwrite(
cmd[ 0 ]
cmd[ 1 ]
cmd[ 2 ]
cmd[ 3 ]
pad, queryStr );
= UNL;
= UNT;
= TA + pad;
= MLA;
//
ibcmd( bd, cmd, 4 );
ibrd( bd, rxBuf, sizeof( rxBuf ) - 1 );
rxBuf[ ibcnt ] = ‘ \0 ’;
ibcmd( bd, cmd, 2);
}
void main( )
{
setNi( 0, “GPIB” );// Sets the status of PC’s GPIB CARD.
//
Niread( 8, “*IDN?” );// Reads back indentity code of MML-4.
cout << rxBuf << “ \n\r ”;
// Displays on the screen of PC.
//
Niwrite( 8, “CHAN 1” );// Sets CHANNEL as 1.
//
Niread( 8, “CHAN:ID?” ); // Reads back identity code of channel
1.cout << rxBuf << “ \n\r ”;// Displays on the screen of PC.
//
Niwrite( 8, “MODE CCL” );
// Sets CHANNEL 1 MODE as CCL.Niwrite (
8, “CURR:STATIV:L1 1” ):
// Sets L1 current of CCL as 1A.
//
Niread( 8, “LOAD ON” ); // Starts sinking current.
//
Niread( 8, “MEAS:VOLT?” ); // Measures the readings of voltage.
cout << rxBuf << “ \n\r ”; // Displays on the screen of PC.
//
Niread( 8, “MEAS:CURR?” ); // Measures the readings of current.
cout << rxBuf << “ \n\r ”; // Displays on the screen of PC.
Niread( 8, “LOAD OFF” ); // Stops sinking current.
//
ibsic ( bd );
ibon1( bd, 0 );
ibsre ( bd, 0 );
}
For the above example, please refer to Chapter 3, and add corresponding commands
according to settings and controls.
6-2
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7 CALIBRATION PROCEDURES
7.1 Introduction
This section covers the calibration procedures of the MML series load modules. The load
modules should be calibrated annually, or whenever some repairs are made. To calibrate a
load module, you must disconnect the load module from the mainframe, and open the
module’s cover for measurement and/or adjustment. Refer to subsection 7.9 for removing
load modules. Use a ribbon cable (P/N: 881-803-31) to connect the load module with the
mainframe for calibration. For model MML-80-120-601 and MML-500-20-601 two ribbon
cables are needed for connection. When removing a load module from the mainframe, you
must put a fan on the back of the module to dissipate heat.
Refer to figure 7-1, 7-2, 7-3 for CC, CR, CV calibration equipment setup.
For manual calibration, press LOAD to disable the load module input when you change
mode or range, and press this key again to enable. After calibration, turn off the power,
reassemble the load module, and replace the module into the mainframe.
Press A/B and STATIC/DYNA simultaneously and hold it for approximately 2 seconds to
enter into the calibration mode, you must follow the calibration sequence. In calibration
mode, press A/B or R/L to go to the previous calibration procedure, and press
STATIC/DYNA to go to the next procedure, and press LOAD to save data and go to the
next procedure. After calibration, you must turn off the power, and turn it on again to
initialize the calibration data.
7.1
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Sorensen MML Series Operation and Programming Manual
7.2 Test and Calibration Setup Configuration
DMM (I)
CURRENT SHUNT
RESISTOR
POWER
SUPPLY
ELECTRONIC
LOAD
Figure 7-1 Test Setup for CC Mode
DMM (I)
DMM (V)
POWER
SUPPLY
ELECTRONIC
LOAD
Figure 7-2 Test Setup for CR Mode
DMM (V)
POWER
SUPPLY
ELECTRONIC
LOAD
Figure 7-3 Test Setup for CV Mode
7-2
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Calibration Procedures
7.3 Required Test Equipment
The required test equipment is shown below.
Type
Recommended Model
Required Characteristics
DMM
5 1/2 digits or more
HP34401A, HP3458A
Current Shunt
0.05% accuracy
PRODIGIT 7550
10
[email protected]
VALHALLA 2575A
0.1
[email protected]
0.01
[email protected]
0.001
[email protected]/100A
(250A for models of 63106, 63112)
DC Sources
For: MML-80-20-102
Use: DLM80-7.5 and DLM8-75
For: MML-80-60-301
Use: DLM80-7.5 and DLM8-75
For: MML-80-120-601
Use: DLM80-7.5 and DCS8-125
For: MML-500-10-301
Use: DCS600-1.7E and DLM8-75
For: MML-500-20-601
Use: DCS600-1.7E and DLM8-75
Oscilloscope
100MHz
Tektronics TDS340
Extender Cable
32-pin ribbon cable
Chroma part No. 806 31000
DC Power Supply
12V, 3A
GW3030
FAN
100 CFM
FLOWMAX
4715KL-04W-B30(DC:12V)
NOTE
The TPA7, TPB7 ... And VRA5, VRB5 ... are referred to in many of the
troubleshooting/check/adjustment procedures. TPA represents the test point
on side A while TPB that on side B. TPB is only used by the dual channel/
module of the left channel. VRA represents the variable resistor on side A
while VRB that on side B. VRB is only used by the dual channel/module
of the left channel. Side A is isolated from side B.
7-3
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Sorensen MML Series Operation and Programming Manual
7.4 Calibration Procedures of MML-80-20-102
Reference voltage adjustment:
1. Channel L adjustment
Connect DMM+ to TPB4 on board A , DMM− to TPB3 on board A.
Adjust VRB4 on board A until DMM (DC) = −10.2400 ± 0.0005V.
Connect DMM+ to TPB6 on board L, DMM− to TPB3 on board A.
Adjust VRB10 on board L until DMM (DC) = 2.5600 ± 0.0002V.
2. Channel R adjustment
Connect DMM+ to TPA4 on board A, DMM− to TPA3 on board A.
Adjust VRA4 on board A until DMM (DC) = −10.2400 ± 0.0005V.
Connect DMM+ to TPA6 on board L, DMM− to TPA3 on board A.
Adjust VRA10 on board L until DMM (DC) = 2.5600 ± 0.0002V.
Measurement offset calibration:
Short channel L input terminals. Press R-/L and STATIC/DYNA simultaneously over one
second, and the module will go to calibration mode.
Adjust VRB11 on board L till the module’s display is as follows:
<<− offset calibration of low range voltage in channel L
<<− xx:25 to 40(hex)
LoFFS
00XX
Press LOAD
, wait two seconds, and check the module’s display:
HoFFS
00XX
<<− offset calibration of high range voltage in channel L
<<− xx:25 to 40(hex)
Press LOAD , wait two seconds, and check the module’s display:
LoFFS
00XX
Press LOAD
<<− offset calibration of low range current in channel L
<<− xx:25 to 40(hex)
, wait two seconds, and check the module’s display:
HoFFS
00XX
<<− offset calibration of high range current in channel L
<<− xx:25 to 40(hex)
7-4
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Calibration Procedures
Short Channel R input terminals.
Press
LOAD and adjust VRA11 on board L till the module’s display is as follows:
LoFFS
00XX
Press LOAD
, wait two seconds, and check the module’s display:
HoFFS
00XX
Press LOAD
<<− offset calibration of high range voltage in channel R
<<− xx:25 to 40(hex)
, wait two seconds, and check the module’s display:
LoFFS
00XX
Press LOAD
<<− offset calibration of low range voltage in channel R
<<− xx:25 to 40(hex)
<<− offset calibration of low range current in channel R
<<− xx:25 to 40(hex)
, wait two seconds, and check the module’s display:
HoFFS
00XX
<<− offset calibration of high range current in channel R
<<− xx:25 to 40(hex)
Press LOAD
to let the module go to normal display mode.
Remove input terminal’s short circuit.
Voltage measurement adjustment (channel L):
Set channel L of the load module to CRH mode.
Apply DC source to the input terminals of channel L, and set the DC source to 80V and
current limit 1A. Connect DMM to input terminals of channel L. Adjust VRB9 on board L
until the display of voltage in channel L = DMM (V) reading ± 0.01V.
Current offset adjustment (channel L):
Set the DC source to 5V/200mA and current shunt range to 20mA.
Set channel L to CCL mode and program the current to 2mA.
Adjust VRB2 on board L until shunt current = 1.95 to 2.05mA.
Set channel L to CCH mode and program the current to 20mA.
Adjust VRB6 on board L until shunt current = 19.8 to 20.2mA.
7-5
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Sorensen MML Series Operation and Programming Manual
Current setting/measurement adjustment (channel L):
Set the DC source to 5V/2.1A and current shunt range to 2A.
Set channel L to CCL mode and program the current to 2A.
Adjust VRB1 on board L until shunt current = 1.999 to 2.001A.
Adjust VRB3 on board L until display current = 1.999 to 2.001A.
Set the DC source to 5V/21A and current shunt range to 20A.
Set channel L to CCH mode and program the current to 20A.
Adjust VRB5 on board L until shunt current = 19.99 to 20.01A.
Adjust VRB7 on board L until display current = 19.99 to 20.01A.
CR mode adjustment (channel L):
Set the DC source to 15V and current limit to 10A.
Set channel L to CRL mode and program resistance to 3 ohms.
Adjust VRB1 on board A until DMM (V) reading/3 ohms = shunt current ± 2mA.
CV mode adjustment (channel L):
Select CV mode of channel L and program CV voltage to 76V.
Set current limit of CV mode to 1A in configuration.
Set the DC source to 80V/0.1A.
Adjust VRB2 on board A until DMM (V) reading = 75.997 to 76.003V.
Voltage measurement adjustment (channel R):
Set channel R of the load module to CRH mode.
Apply DC source to the input terminals of channel R and set the DC source to 80V/0.1A.
Adjust VRA9 on board L until the display of voltage in channel R = DMM (V) reading
± 0.01V.
Current offset adjustment (channel R):
Set the DC source to 5V/200mA and current shunt range to 20mA.
Set channel R to CCL mode and program the current to 2mA.
Adjust VRA2 on board L until shunt current = 1.95 to 2.05mA.
Set channel R to CCH mode and program the current to 20mA.
Adjust VRA6 on board L until shunt current = 19.8 to 20.2mA.
7-6
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Calibration Procedures
Current setting/measurement adjustment (channel R):
Set the DC source to 5V/2.1A and current shunt range to 2A.
Set channel R to CCL mode and program the current to 2A.
Adjust VRA1 on board L until shunt current = 1.999 to 2.001A.
Adjust VRA3 on board L until display current = 1.999 to 2.001A.
Set the DC source to 5V/21A and current shunt range to 20A.
Set channel R to CCH mode and program the current to 20A.
Adjust VRA5 on board L until shunt current = 19.99 to 20.01A.
Adjust VRA7 on board L until display current = 19.99 to 20.01A.
CR mode adjustment (channel R):
Set the DC source to 15V/10A.
Set channel L to CRL mode and program resistance to 3 ohms.
Adjust VRA1 on board A until DMM (V) reading/3 ohms = shunt current ± 2mA.
CV mode adjustment (channel R):
Set channel L to CV mode and program CV voltage to 76V.
Set current limit of CV mode to 1A in configuration.
Set the DC source to 80V/0.1A.
Adjust VRA2 on board A until DMM (V) reading = 75.997 to 76.003V.
7.5 Calibration Procedures of MML-80-60-301
Reference voltage adjustment:
Connect DMM+ to TPA4 on board A , DMM− to TPA3 on board A.
Adjust VRA4 on board A until DMM (DC) = −10.2400 ± 0.0005V.
Connect DMM+ to TPA6 on board L, DMM− to TPA3 on board A.
Adjust VRA10 on board L until DMM (DC) = 2.5600 ± 0.0002V.
Measurement offset calibration:
Short the module’s input terminals of +, −.
Press A/B and STATIC/DYNA simultaneously over one second to let the module
go to calibration mode.
7-7
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Sorensen MML Series Operation and Programming Manual
Adjust VRA11 on board L until the module’s display is as follows:
LoFFS
<<− offset calibration of low range voltage
00XX
<<− xx:25 to 40(hex)
Press LOAD
, wait two seconds, and check the module’s display:
HoFFS
00XX
Press LOAD
, wait two seconds, and check the module’s display:
<<− offset calibration of low range current
<<− xx:25 to 40(hex)
LoFFS
00XX
Press LOAD
<<− offset calibration of high range voltage
<<− xx:25 to 40(hex)
, wait two seconds, and check the module’s display:
HoFFS
00XX
<<− offset calibration of high range current
<<− xx:25 to 40(hex)
Remove input terminals’ short circuit. Press LOAD
to return to normal display mode.
Voltage measurement adjustment:
Set the load module to CRH mode.
Set the DC source to 80V/0.1A. Connect DMM to the module’s input terminals.
Adjust VRA9 on board L until the display voltage = DMM (V) reading ± 0.01V.
Current offset adjustment:
Set the DC source to 5V/200mA and current shunt range to 200mA.
Set the load module to CCL mode and program the current to 6mA.
Adjust VRA2 on board L until shunt current = 5.9 to 6.1mA.
Set the load module to CCH mode and program the current to 60mA.
Adjust VRA6 on board L until shunt current = 59.5 to 60.5mA.
Current setting/measurement adjustment:
Set the DC source to 5V/7A and current shunt range to 20A.
Set the load module to CCL mode and program the current to 6A.
7-8
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Calibration Procedures
Adjust VRA1 on board L until shunt current = 5.997 to 6.003A.
Adjust VRA3 on board L until display current = 5.997 to 6.003A.
Set the DC source to 5V/61A and current shunt range to 100/250A.
Set the load module to CCH mode and program the current to 60A.
Adjust VRA5 on board L until shunt current = 59.97 to 60.03A.
Adjust VRA7 on board L until display current = 59.97 to 60.03A.
CR mode adjustment:
Set the DC source to 15V/20A and current shunt range to 20A.
Set the load module to CRL mode and program resistance to 1 ohm.
Adjust VRA1 on board A until DMM (V) reading/1 ohm = shunt current ± 3mA.
CV mode adjustment:
Set channel L to CV mode and program CV voltage to 76V.
Set current limit of CV mode to 1A in configuration.
Set the DC source to 80V/0.1A.
Adjust VRA2 on board A until DMM (V) reading = 75.997 to 76.003V.
7.6 Calibration Procedures of MML-500-10-301
Reference voltage adjustment:
Connect DMM+ to TPA4 on board A , DMM− to TPA3 on board A.
Adjust VRA4 on board A until DMM (DC) = −10.2400 ± 0.0005V.
Reference voltage check:
Connect DMM+ to TPA6 on board L , DMM− to TPA3 on board A.
Check DMM (DC) = 2.48 to 2.60V.
Software calibration procedures:
1. Measurement offset calibration
Short the module’s input terminals of +, −.
Press A/B and STATIC/DYNA
simultaneously over two seconds to let the module
go to calibration mode.
The module displays:
LoFFS
<<− offset calibration of low range voltage
XXXX
xxxx: offset data of low range voltage measurement
7-9
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Sorensen MML Series Operation and Programming Manual
Press LOAD
, wait two seconds, and check the module’s display:
HoFFS
<<− offset calibration of high range voltage
XXXX
xxxx: offset data of high range voltage measurement
Press LOAD
, wait two seconds, and check the module’s display:
LoFFS
XXXX
Press LOAD
<<− offset calibration of low range current
xxxx: offset data of low range current measurement
, wait two seconds, and check the module’s display:
HoFFS
XXXX
<<− offset calibration of high range current
xxxx: offset data of high range current measurement
Remove input terminals’ short circuit.
2. Voltage measurement full-scale calibration
Press LOAD and the module displays:
2.FS
uL
Set the DC source to 125V/0.1A, and apply to the load module’s input terminals.
Press LOAD and the module displays:
AAAAA
BBBBB
AAAAA represents the load module’s voltage measurement before calibration.
BBBBB represents the load module’s voltage measurement after calibration.
Adjust the knob of the module until DMM (V) reading = BBBBB ± 1 count.
Press LOAD and the module displays:
SAvE
Save the low range full-scale data.
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Calibration Procedures
Press
LOAD and the module displays:
3.FS
uH
Set the DC source to 500V/0.1A.
Press
LOAD and the module displays:
CCCCC
DDDDD
CCCCC represents the load module’s voltage measurement before calibration.
DDDDD represents the load module’s voltage measurement after calibration.
Adjust the knob of the module until DMM (V) reading = DDDDD ± 1 count.
Press LOAD and the module displays:
SAvE
Save the high range full-scale data.
3. Current measurement calibration
Press LOAD and the module displays:
4.FS
AL
Set the DC source to 5V/2.1A and current shunt range to 2A.
Press LOAD and the module displays:
EEEEE
FFFFF
EEEEE represents the load module’s current measurement before calibration.
FFFFF represents the load module’s current measurement after calibration.
Adjust the knob of the module until shunt current = FFFFF ± 1 count.
Press
LOAD and the module displays:
7-11
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Sorensen MML Series Operation and Programming Manual
SAvE
Save CCL measurement data.
Press
LOAD and the module displays:
5.FS
AH
Set the DC source to 5V/21A and current shunt range to 20A.
Press
LOAD and the module displays:
GGGGG
HHHHH
GGGGG represents the load module’s current measurement before calibration.
HHHHH represents the load module’s current measurement after calibration.
Adjust the knob of the module until shunt current = HHHHH ± 1 count.
Press LOAD and the module displays:
SAvE
Save CCH measurement data.
4. Current setting offset calibration
Set the DC source to 5V/20mA and current shunt range to 20mA.
Press
LOAD and the module displays:
6.oFF
CCL
Press
LOAD and the module displays:
KKKKK
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Calibration Procedures
Adjust the knob of the module until shunt current = 0 to 0.5mA.
Press LOAD and the module displays:
SAvE
Save CCL offset data.
Press
LOAD
and the module displays:
7.oFF
CCH
Press
LOAD and the module displays:
LLLLL
Adjust the knob of the module until shunt current = 0 to 5mA.
Press LOAD and the module displays:
SAvE
Save CCH offset data.
5. Current setting calibration
Set the DC source to 5V/5A and current shunt range to 2A.
Press LOAD and the module displays:
8.FS
CCL
Press
LOAD and the module displays:
0.9000
PPPPP
0.9000 represents the load module’s current setting before calibration.
PPPPP represents the load module’s current setting after calibration.
7-13
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Sorensen MML Series Operation and Programming Manual
Adjust the knob of the module until shunt current = PPPPP ± 1 count.
Press LOAD and the module displays:
SAvE
Save CCL setting data.
Set the DC source to 5V/10A and current shunt range to 20A.
Press LOAD and the module displays:
9.FS
CCH
Press
LOAD and the module displays:
9.0000
RRRRR
9.0000 represents the load module’s current setting before calibration.
RRRRR represents the load module’s current setting after calibration.
Adjust the knob of the module until shunt current = RRRRR ± 1 count.
Press LOAD and the module displays:
SAvE
Save CCH setting data.
6. CR mode calibration
Set the DC source to 20V/6A and current shunt range to 20A.
Press
LOAD and the module displays:
10.FS
CrL
Press
LOAD and the module displays:
5.0000
SSSSS
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Calibration Procedures
5.0000 represents the load module’s resistance setting before calibration.
SSSSS represents the load module’s resistance setting after calibration.
Adjust the knob of the module until DMM (V) reading/shunt current = SSSSS (ohms)
± 1 count.
Press LOAD and the module displays:
SAvE
Save CRL setting data.
Press
LOAD and the module displays:
11.FS
CrH
Set the DC source to 50V/1A and current shunt range to 2A.
Press
LOAD and the module displays:
20.000
TTTTT
20.000 represents the load module’s resistance setting before calibration.
TTTTT represents the load module’s resistance setting after calibration.
Note: Because of the module’s display limitation, the resistance setting is 200 ohms,
not 20 ohms.
Adjust the knob of the module until DMM (V) reading/shunt current = TTTTT (ohms)
± 1 count.
Press
LOAD and the module displays:
SAvE
Save CRH setting data.
7. CV mode calibration
Set the DC source to 500V and current limit to 0.1A.
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Sorensen MML Series Operation and Programming Manual
Press
LOAD and the module displays:
12.FS
Cu
Press
LOAD and the module displays:
475.00
UUUUU
475.00 represents the load module’s CV voltage setting before calibration.
UUUUU represents the load module’s CV voltage setting after calibration.
Adjust the knob of the module until DMM (V) reading = UUUUU ± 1 count.
Press LOAD and the module displays:
SAvE
Save CV setting data.
Recycle the power switch after calibration.
7.7 Calibration Procedures of MML-80-120-601
Reference voltage adjustment:
Connect DMM+ to TPA4 on board A , DMM− to TPA3 on board A.
Adjust VRA4 on board A until DMM (DC) = −10.2400 ± 0.0005V.
Reference voltage check:
Connect DMM+ to TPA6 on board L , DMM− to TPA3 on board A.
Check DMM (DC) = 2.48 to 2.60V.
Software calibration procedures:
1. Measurement offset calibration
Short the module’s input terminals of +, −.
Press A/B and
STATIC/DYNA simultaneously over one second to let the module
go to calibration mode.
The module displays:
Press
LoFFS
<<− offset calibration of low range voltage
XXXX
xxxx: offset data of low range voltage measurement
LOAD , wait two seconds, and check the module’s display:
7-16
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Calibration Procedures
HoFFS
XXXX
Press
LOAD , wait two seconds, and check the module’s display:
LoFFS
XXXX
Press
<<− offset calibration of high range voltage
xxxx: offset data of high range voltage measurement
<<− offset calibration of low range current
xxxx: offset data of low range current measurement
LOAD , wait two seconds, and check the module’s display:
HoFFS
XXXX
<<− offset calibration of high range current
xxxx: offset data of high range current measurement
Remove input terminals’ short circuit.
2. Voltage measurement full-scale calibration
Press
LOAD and the module displays:
2.FS
uL
Set the DC source to 16V/0.1A, and apply DC source to the load module’s input terminals.
Press LOAD and the module displays:
AAAAA
BBBBB
AAAAA represents the load module’s voltage measurement before calibration.
BBBBB represents the load module’s voltage measurement after calibration.
Adjust the knob of the module until DMM (V) reading = BBBBB ± 1 count.
Press
LOAD and the module displays:
SAvE
Save the low range full-scale data.
Press
LOAD and the module displays:
7-17
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Sorensen MML Series Operation and Programming Manual
3.FS
uH
Set the DC source to 80V/0.1A.
Press
LOAD and the module displays:
CCCCC
DDDDD
CCCCC represents the load module’s voltage measurement before calibration.
DDDDD represents the load module’s voltage measurement after calibration.
Adjust the knob of the module until DMM (V) reading = DDDDD ± 1 count.
Press LOAD and the module displays:
SAvE
Save the high range full-scale data.
3. Current measurement calibration
Press LOAD and the module displays:
4.FS
AL
Set the DC source to 5V/15A and current shunt range to 20A.
Press
LOAD and the module displays:
EEEEE
FFFFF
EEEEE represents the load module’s current measurement before calibration.
FFFFF represents the load module’s current measurement after calibration.
Adjust the knob of the module until shunt current = FFFFF ± 1 count.
Press
LOAD and the module displays:
7-18
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Calibration Procedures
SAvE
Save CCL measurement data.
Press
LOAD and the module displays:
5.FS
AH
Set the DC source to 5V/125A and current shunt range to 250A.
Press
LOAD
and the module displays:
GGGGG
HHHHH
GGGGG represents the load module’s current measurement before calibration.
HHHHH represents the load module’s current measurement after calibration.
Adjust the knob of the module until shunt current = HHHHH ± 1 count.
Press LOAD and the module displays:
SAvE
Save CCH measurement data.
4. Current setting offset calibration
Set the DC source to 5V/20mA and current shunt range to 20mA.
Press
LOAD and the module displays:
6.oFF
CCL
Press
LOAD and the module displays:
KKKKK
Adjust the knob of the module until shunt current = 0 to 3mA.
7-19
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Sorensen MML Series Operation and Programming Manual
Press
LOAD and the module displays:
SAvE
Save CCL offset data.
Press
LOAD and the module displays:
7.oFF
CCH
Press
LOAD and the module displays:
LLLLL
Adjust the knob of the module until shunt current = 0 to 30mA.
Press LOAD and the module displays:
SAvE
Save CCH offset data.
5. Current setting calibration
Set the DC source to 5V/15A and current shunt range to 20A.
Press LOAD and the module displays:
8.FS
CCL
Press
LOAD and the module displays:
10.800
PPPPP
10.800 represent the load module’s current setting before calibration.
PPPPP represents the load module’s current setting after calibration.
Adjust the knob of the module until shunt current = PPPPP ± 1 count.
7-20
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Calibration Procedures
Press
LOAD and the module displays:
SAvE
Save CCL setting data.
Set the DC source to 5V/125A and current shunt range to 250A.
Press
LOAD and the module displays:
9.FS
CCH
Press
LOAD and the module displays:
108.00
RRRRR
108.00 represents the load module’s current setting before calibration.
RRRRR represents the load module’s current setting after calibration
Adjust the knob of the module until shunt current = RRRRR ± 1 count.
Press LOAD and the module displays:
SAvE
Save CCH setting data.
6. CR mode calibration
Set the DC source to 1.5V/60A and current shunt range to 100A.
Press LOAD and the module displays:
10.FS
CrL
Press
LOAD and the module displays:
0.0500
SSSSS
0.0500 represents the load module’s resistance setting before calibration.
7-21
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Sorensen MML Series Operation and Programming Manual
SSSSS represents the load module’s resistance setting after calibration.
Adjust the knob of the module until DMM (V) reading/shunt current = SSSSS (ohms)
± 1 count.
Press LOAD and the module displays:
SAvE
Save CRL setting data.
Press
LOAD and the module displays:
11.FS
CrH
Set the DC source to 5V/5A.
Press
LOAD and the module displays:
2.5000
TTTTT
2.5000 represents the load module’s resistance setting before calibration.
TTTTT represents the load module’s resistance setting after calibration.
Adjust the knob of the module until DMM (V) reading/shunt current = TTTTT (ohms)
± 1 count.
Press
LOAD and the module displays:
SAvE
Save CRH setting data.
7. CV mode calibration
Set the DC source to 80V/0.1A.
Press LOAD and the module displays:
12.FS
Cu
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Calibration Procedures
Press
LOAD and the module displays:
76.000
UUUUU
76.000 represents the load module’s CV voltage setting before calibration.
UUUUU represents the load module’s CV voltage setting after calibration.
Adjust the knob of the module until DMM (V) reading = UUUUU ± 1 count.
Press
LOAD and the module displays:
SAvE
Save CV setting data.
Recycle the power switch after calibration.
7.8 Calibration Procedures of MML-500-20-601
Reference voltage adjustment:
Connect DMM+ to TPA4 on board A, DMM− to TPA3 on board A.
Adjust VRA4 on board A until DMM (V) = −10.2400 ± 0.0005V.
Reference voltage check:
Connect DMM+ to TPA6 on board L, DMM− to TPA3 on board A.
Check DMM (V) = 2.48 to 2.60V.
Software calibration procedures
1. Measurement offset calibration
Short the module’s input terminals of +, −.
Press A/B and STATIC/DYNA
go to calibration mode.
simultaneously over one second to let the module
The module displays:
LoFFS
XXXX
<<− offset calibration of low range voltage
xxxx: offset data of low range voltage measurement
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Sorensen MML Series Operation and Programming Manual
Press
LOAD , wait two seconds, and check the module’s display:
HoFFS
XXXX
Press
Press
<<− offset calibration of high range voltage
xxxx: offset data of high range voltage measurement
LOAD , wait two seconds, and check the module’s display:
LoFFS
<<− offset calibration of low range current
XXXX
xxxx: offset data of low range current measurement
LOAD , wait two seconds, and check the module’s display:
HoFFS
<<− offset calibration of high range current
XXXX
xxxx: offset data of high range current measurement
Remove input terminals’ short circuit.
2. Voltage measurement full-scale calibration
Press LOAD and the module displays:
2.FS
uL
Set the DC source to 125V/0.1A, and apply DC source to the load module’s input terminals.
Press LOAD and the module displays:
AAAAA
BBBBB
AAAAA represents the load module’s voltage measurement before calibration.
BBBBB represents the load module’s voltage measurement after calibration.
Adjust the knob of the module until DMM (V) reading = BBBBB ± 1 count.
Press LOAD
and the module displays:
SAvE
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Calibration Procedures
Save the low range full-scale data.
Press LOAD and the module displays:
3.FS
uH
Set the DC source to 500V/0.1A.
Press LOAD and the module displays:
CCCCC
DDDDD
CCCCC represents the load module’s voltage measurement before calibration.
DDDDD represents the load module’s voltage measurement after calibration.
Adjust the knob of the module until DMM (V) reading = DDDDD ± 1 count.
Press LOAD and the module displays:
SAvE
Save the high range full-scale data.
2. Current measurement calibration
Press LOAD and the module displays:
4.FS
AL
Set the DC source to 5V/2A and current shunt range to 2A.
Press LOAD
and the module displays:
EEEEE
FFFFF
EEEEE represents the load module’s current measurement before calibration.
FFFFF represents the load module’s current measurement after calibration.
Adjust the knob of the module until shunt current = FFFFF ± 1 count.
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Press LOAD
and the module displays:
SAvE
Save CCL measurement data.
Press LOAD
and the module displays:
5.FS
AH
Set the DC source to 5V/21A and current shunt range to 20A.
Press LOAD and the module displays:
GGGGG
HHHHH
GGGGG represents the load module’s current measurement before calibration.
HHHHH represents the load module’s current measurement after calibration.
Adjust the knob of the module until shunt current = HHHHH ± 1 count.
Press LOAD and the module displays:
SAvE
Save CCH measurement data.
3. Current setting offset calibration
Set the DC source to 5V/20mA and current shunt range to 20mA.
Press LOAD
and the module displays:
6.oFF
CCL
Press LOAD
and the module displays:
KKKKK
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Calibration Procedures
Adjust the knob of the module until shunt current = 0 to 1mA.
Press LOAD and the module displays:
SAvE
Save setting offset data.
Press LOAD
and the module displays:
7.oFF
CCH
Press LOAD
and the module displays:
LLLLL
Adjust the knob of the module until shunt current = 0 to 5mA.
Press LOAD and the module displays:
SAvE
Save CCH offset data.
4. Current setting calibration
Set the DC source to 5V/2A and current shunt range to 2A.
Press LOAD and the module displays:
8.FS
CCL
Press LOAD
and the module displays:
1.8000
PPPPP
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Sorensen MML Series Operation and Programming Manual
1.8000 represents the load module’s current setting before calibration.
PPPPP represents the load module’s current setting after calibration.
Adjust the knob of the module until shunt current = PPPPP ± 1 count.
Press LOAD
and the module displays:
SAvE
Save CCL setting data.
Set the DC source to 5V/20A and current shunt range to 20A.
Press LOAD and the module displays:
9.FS
CCH
Press LOAD
and the module displays:
18.000
RRRRR
18.000 represents the load module’s current setting before calibration.
RRRRR represents the load module’s current setting after calibration.
Adjust the knob of the module until shunt current = RRRRR ± 1 count.
Press LOAD and the module displays:
SAvE
Save CCH setting data.
6. CR mode calibration
Set the DC source to 20V/10A and current shunt range to 20A.
Press LOAD and the module displays:
10.FS
CrL
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Calibration Procedures
Press LOAD
and the module displays:
2.5000
SSSSS
2.5000 represents the load module’s resistance setting before calibration.
SSSSS represents the load module’s resistance setting after calibration.
Adjust the knob of the module until DMM (V) reading/shunt current = SSSSS (ohms)
± 1 count.
Press LOAD
and the module displays:
SAvE
Save CRL setting data.
Press LOAD
and the module displays:
11.FS
CrH
Set the DC source to 50V/2A and current shunt range to 2A.
Press LOAD
and the module displays:
10.000
TTTTT
10.000 represents the load module’s resistance setting before calibration.
TTTTT represents the load module’s resistance setting after calibration.
Note: Because of the module’s display limitation, the resistance setting is 100 ohms, not
10 ohms. Adjust the knob of the module until DMM (V) reading/shunt current = TTTTT
(ohms) ± 1 count.
Press LOAD
and the module displays:
SavE
Save CRH setting data.
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7. CV mode calibration
Set the DC source to 500V/0.1A.
Press LOAD
and the module displays:
12.FS
Cu
Press LOAD
and the module displays:
475.00
UUUUU
475.00 represents the load module’s CV voltage setting before calibration.
UUUUU represents the load module’s CV voltage setting after calibration.
Adjust the knob of the module until DMM (V) reading = UUUUU ± 1 count.
Press LOAD and the module displays:
SAvE
Save CV setting data.
Recycle the power switch after calibration.
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Calibration Procedures
7.9 Removing Load Modules
CAUTION
This assembly contains static sensitive components. Observe all standard
electro-static procedures when removing or replacing the GPIB board.
1.
2.
3.
4.
Disconnect all wires connected to the front of the module.
Remove the two screws securing the module, and pull out the module by holding
the load connector.
Place the module on the workbench.
Remove the eight screws on the top and bottom sides, and the three screws on the
left side. Then, remove the module’s cover.
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