User manual | MML - Modular Medium Programmable DC Electronic Loads

MML - Modular Medium Programmable DC Electronic Loads
The MML Series Programmable DC
Electronic Loads are ideal for test
environments requiring a variety of
medium power loads. This series has
single input loads from 100W to 600W.
Two mainframe sizes, both 4U (7”)
high, accommodate either benchtop
(10.8”) wide or full rackmount environments.
This DC load series is ideal for
engineering or manufacturing test applications. The loads have been designed to
test AC to DC converters, DC to DC
converters, power storage devices and
electronic components. The system is
easily configured by using front panel
plug-in modules. The system can be
operated by front panel keypad control,
standard RS 232 or optional IEEE-488.2
control interface.
The MML Series, 80V modules are
available in three power levels, 100
watts x 2 (dual input), 300 watts and
600 watts, all at 80 volts maximum.
The 500V modules are available in two
power levels, 300W and 600W at 500V
maximum. This series can be operated
in constant current, constant voltage
and constant resistance modes. Each
load is isolated and floating, programmable in two current ranges and capable of being synchronized with other
load modules in the same mainframe.
Each load can simulate a wide dynamic
range of loading conditions, including
short circuit simulations. Load test
sequences can be programmed with
different slew rates, load levels,
durations and modes. In addition, 10
programs can be stored with up to 10
sequences per program and can be
recalled for automated sequencing.
Real time measurement of voltage and
current with 15-bit resolution is built
into each module. Protection includes
overpower, overcurrent, overvoltage,
overtemperature and reverse polarity
to ensure safety and reliability.
KEY FEATURES
Module Variety:
• Load Module Increments: 100W x
2 (dual input, 80V only), 300W
and 600W (80V or 500V)
• Programmable control of constant
current, constant voltage or
constant resistance
• Push button or programmed short
circuit test
• Flexible Modular Configuration
• Continuous or pulsed loading
(up to 20 kHz)
• Up to 8 (100W) channels in one
19-inch mainframe
• Adjustable slew rates to 5A/µs
• Two mainframe configurations, 4
bay (rackmount) and 2 bay
(benchtop)
• Parallel operation to 1200 watts in
one mainframe
• Individually optically isolated and
floating load modules
• High and low limit mode settings
• 10 program memories
• LabVIEW Drivers
Measurement and Protection:
• Accurate readback of voltage and
current with 15-bit resolution
• Remote voltage sensing capability
Manual or Programmable Control:
• Self test at power-on
• Standard front panel and RS 232
control or optional IEEE-488.2
interface
• OPP, OCP, OVP, OTP and reverse
polarity protection
• Analog Go/No-Go status for each
module input
MODULAR RACKMOUNT AND BENCHTOP LOAD SIMULATION
Sorensen MML programmable electronic loads are easily configured. Plug-in modules only require front panel access for installation or removal from both the four bay and two bay mainframe. Only the mainframe requires the AC input power connection.
Rackmount Load Simulation
Benchtop Load Simulation
Up to eight load inputs can be configured in the 19-inch
four bay mainframe (MML-4). This is accomplished by
using four MML-80-20-102 modules (each module has
dual 100W inputs). Any combination of load modules can
be configured in the mainframe. Individual modules
require the following mainframe space:
80V, 100W x 2 inputs - 1 bay wide
80V, 300W input
- 1 bay wide
80V, 600W input
- 2 bays wide
500V, 300W input
- 1 bay wide
500V, 600W input
- 2 bays wide
Benchtop load simulation is easily accomplished using the
narrower double bay mainframe (MML-2). The mainframe
controller (common to the 4 bay and 2 bay mainframe)
has front panel digital keypad controls which include a
numeric keypad and special function keys for selecting
load module channel, mode of operation and go/no-go test
limits. Programming keys allow setting, clearing, saving or
recalling data. A configuration key allows display of mainframe firmware status, control of module synchronization
and other system level parameters.
Individual modules have their own front panel control, in
addition to the mainframe controller. Each module has
push button controls for turning the module on, enabling
a short circuit test, left or right channel selection (only
applies to dual input load modules), selecting static or
dynamic load conditions. An analog knob allows easy
continuous manual adjustment of the load level setting.
Both the four bay (MML-4) and the two bay (MML-2)
mainframes come standard with RS 232 and can be
ordered with an optional IEEE-488.2 interface.
Block Diagram of Four Bay Mainframes with 8 loads (from dual input load modules)
Load Simulation
Module Input Characteristics
V
V
I
I
Constant Current Mode
Constant Resistance Mode
Applications include testing:
• Power supplies
• Batteries
• Capacitor discharge
• Characteristics
Applications include testing:
• Power supply crossover
• Power supply start-up
• Loads requiring resistor
• Simulation
The modules incorporate MOSFET power devices to regulate
the programmed load conditions. This FET technology
achieves minimum input resistance while enabling high
current sink capability at low voltages. For example, the
300W (MML-80-60-301) module is capable of sinking
60 amps down to 1V. Lower voltage operation is possible at
reduced current levels. This low voltage range is suitable
for testing the new low voltage (i.e. 3V) power supplies.
80
70
60
50
40
V
I
30
20
10
0
I
3.75
T
10
20
30
40
50
60
Ampere
Constant Voltage Mode
Applications include testing:
• Current sources
• Current set-points
• Current shunt regulators
Pulsed Mode, Programmable
Slew Rate and Duty Cycle
Applications include testing:
• Power supplies
• Transient response
• Characteristics
• Components
300W, 80V module input characteristics 0-80 volts
1.0
0.9
Operating Zone
Below 1 Volt
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Dynamic Loading Control
0.0
0.0
5.0
10.0 15.0 20.0
25.0
30.0 35.0
40.0 45.0 50.0
55.0
60.0
65.0
Ampere
300W, 80V module input characteristics below 1 volt
Load Level 2
Rise
Time
Fall
Time
Load Level 1
1.0
0.9
T1
T2
Operating Zone
Below 1 Volt
0.8
0.7
0.6
0.5
As electronic systems operate at increasingly higher
speeds, power supplies and devices must perform with
more dynamic load conditions. The MML Series electronic
load has been designed to simulate these conditions. The
figure above illustrates the programmable load parameters.
Specifically, this is the duty cycle controlled by T1 and T2
, slew rates (rise and fall times) and load levels.
0.4
0.3
0.2
0.1
0.0
0 .0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
22.0
Ampere
100W, 80V module input characteristics below 1 volt
Load Module (100W x 2)
Mainframe Controller
1
8
2
11
9
12
3
4
10
13
14
16
15
17
18
5
20
6
24
19
21
22
7
1
2
3
4
5
6
7
8
9
10
11
12
LED Indicator
SHORT key: To apply a short circuit across the
input
STATIC/DYNA key: To select static or dynamic
test mode
L/R key: To select left or right channel of input
load (only applies to dual channel loads)
V terminal: To measure the UUT’s output voltage
using remote sense
Rotary knob: To adjust load level continuously
Load terminals
Liquid Crystal Display
LED indicator: To display the active load channel
CHAN key: To select input load channel
MODE key: To select the operation mode of CC,
CR, or CV
PROG key: For setting program data
25
23
13 CLEAR key: Clear the current data displayed
14 RECALL key: To recall the setting status from memory
15 SAVE key: To save the front panel settings into memory
16 SPEC key: To set up High/Low limits for Go/No-Go
17
18
19
20
21
22
23
24
25
test
CONF key: To set the mainframe configuration
ON/OFF key: To enable or disable the load input
Up/Down key: To select the next or previous menu
display to edit
Numeric keypad: For data setting
ENTER key: To confirm editing data on the instrument
SHIFT key: As LOCAL key when in remote mode
Power Switch
SHIFT + O key: System function
SHIFT + . key: Lock function
MODEL
MML-80-20-102
MML-80-60-301
MML-80-120-601
Power
20W
100W
30W
300W
60W
600W
Current
0-2A
0-20A
0-6A
0-60A
0-12A
0-120A
1.0V at 2A
1.0V at 20A
1.0V at 6A
1.0V at 60A
1.0V at 12A
1.0V at 120A
Voltage
Min. Operation VDC
1-80V
1-80V
1-80V
Constant Current Mode
Range
Resolution
Accuracy
0~2A
0~20A
0~6A
0~60A
0~12A
0~120A
0.5 mA
5 mA
1.5 mA
15 mA
3 mA
30 mA
0.1% +0.1% F.S.
0.1% + 0.2% F.S.
0.1% + 0.1% F.S.
0.1% + 0.2% F.S.
0.1% + 0.1% F.S.
0.1% + 0.2% F.S.
Constant Resistance Mode
Range
0.075Ω~300Ω (100W/16V)
3.75Ω~15 kΩ (100W/80V)
0.025Ω~100Ω (300W/16V)
1.25Ω~5 kΩ (300W/80V)
0.125Ω-50Ω (600W/16V)
0.625Ω-2.5 kΩ (600W/80V)
12 bits
12 bits
12 bits
CRL 0.1 mho + 0.2% (0.075Ω-300Ω)
CRH 0.01 mho + 0.1% (3.75Ω-15 kΩ)
CRL 0.1 mho + 0.2% (0.025Ω~100Ω)
CRH 0.01 mho + 0.1% (10Ω~5 kΩ)
CRL 0.4 mho + 0.5% (0.0125Ω~50Ω)
CRH 0.04 mho + 0.2% (0.625Ω~2.5 kΩ)
1~80V
1~80V
1~80V
Resolution
Accuracy
Constant Voltage Mode
Range
20 mV
20 mV
20 mV
±(0.05% + 0.1% F.S.)
±(0.05% + 0.1% F.S.)
±(0.05% + 0.1% F.S.)
Resolution
Accuracy
DYNAMIC MODE
Dynamic Mode
T1 & T2
Accuracy
C.C. Mode
C.C. Mode
C.C. Mode
0.025 ms~10 ms/Res:1 µs
1 ms~30s/Res:1 ms
0.25 ms~10 ms/Res:1 µs
1 ms~30s/Res:1 ms
0.025 ms~10 ms/Res:1 µs
1 ms~30s/Res:1 ms
1 µs/1 ms+100 ppm
1 µs/1 ms+100 ppm
1 µs/1 ms+100 ppm
Slew Rate
0.32~80 mA/µs
3.2~800 mA/µs
0.001~0.25A/µs
0.01~2.5A/µs
0.002~0.5A/µs
0.02~5A/µs
Resolution
0.32 mA/µs
3.2 mA/µs
0.001A/µs
0.01A/µs
0.002A/µs
0.02A/µs
0~2A
0~20A
0~6A
0~60A
0~12A
0~120A
5 mA
1.5 mA
15 mA
3 mA
Current
Resolution
0.5 mA
Current Accuracy
±0.4% F.S.
30 mA
±0.4% F.S.
±0.4% F.S.
MEASUREMENT SECTION
Voltage Readback
Range
0~16V
0~80V
0~16V
0~80V
0~16V
0~80V
Resolution
0.5 mV
2.5 mV
0.5 mV
2.5 mV
0.5 mV
2.5 mV
Accuracy
±(0.05% + 0.05% F.S.)
±(0.05% + 0.05% F.S.)
±(0.05% + 0.05% F.S.)
Current Readback
Range
Resolution
Accuracy
0~2A
0~20A
0~6A
0~60A
0~12A
0~120A
0.0625 mA
0.625 mA
0.1875 mA
1.875 mA
0.375 mA
3.75 mA
±(0.1% + 0.1% F.S.)
±(0.1% + 0.1% F.S.)
±(0.1% + 0.1% F.S.)
PROTECTIVE SECTION
Overpower
~20.8W
~104W
~31.2W
~312W
~62.4W
~624W
Overcurrent
~2.04A
~20.4A
~6.12A
~61.2A
~12.24A
~122.4A
~16.3V
~81.6V
~16.3V
~81.6V
~16.3V
~81.6V
Current (CC)
~2.4/2A
~24/20A
~7.2/7A
~72/60A
~14.4/12A
~144/120A
Voltage (CV)
~0V
~0V
~0V
~0V
~0V
~0V
~3.75Ω
~0.075Ω
~1.25Ω
~0.025Ω
~0.625Ω
~0.0125Ω
Overtemperature
Overvoltage
~85°C
~85°C
~85°C
GENERAL
Short Circuit
Resistance (CR)
Input Resistance
(Load Off)
Temperature Coefficient
Power
Dimensions
Weight
100 kΩ (typical)
100 kΩ (typical)
100 kΩ (typical)
100 ppm/°C (typical)
100 ppm/°C (typical)
100 ppm/°C (typical)
Supply from mainframe (115/230 VAC)
Supply from mainframe (115/230 VAC)
Supply from Mainframe (115/230 VAC)
3.19” (81 mm)W x 6.75” (172 mm)H
x 19.5” (495mm)D
3.19” (81 mm)W x 6.75” (172 mm)H
x 19.5” (495mm)D
6.37” (162 mm)W x 6.75” (172 mm)H
x 19.5” (495mm)D
8.9 lbs. (4 kg)
8.9 lbs. (4 kg)
16 lbs. (7.3 kg)
Shipping Weight
9.3 lbs. (4.2 kg)
9.3 lbs. (4.2 kg)
18.5 lbs. (8.4 kg)
Operating Range
0-40°C
0-40°C
0-40°C
CE
CE
CE
EMC & Safety
MODEL
MML-500-10-301
MML-500-10-301
Power
30W
300W
60W
600W
Current
0-1A
0-10A
0-2A
0-20A
2.5V at 10A
2.5V at 2A
2.5V at 20A
Voltage
Min. Operating VDC
2.5-500V
2.5V at 1A
2.5 - 500V
Constant Current Mode
Range
Resolution
Accuracy
0~1A
0~10A
0~2A
0~20A
0.25 mA
2.5 mA
0.5 mA
5 mA
±(0.1% + 0.1% F.S.)
±(0.1% + 0.2% F.S.)
±(0.1% + 0.1% F.S.)
±(0.1% + 0.2% F.S.)
Constant Resistance Mode
Range
1.25Ω~5 kΩ (300W/125V)
50Ω~200 kΩ (300W/500V)
Resolution
Accuracy
0.625Ω~2.5 kΩ (600W/125V)
25Ω~100 kΩ (600W/500V)
12 bits
12 bits
5 kΩ: 2 mmho+0.2%
200 kΩ: 5 mmho+0.1%
2.5 kΩ: 2 mmho+0.2%
100 kΩ: 5 mmho+0.1%
2.5~500V
2.5~500V
Constant Voltage Mode
Range
Resolution
Accuracy
125 mV
125 mV
±(0.05% ± 0.1% F.S.)
±(0.05% ± 0.1% F.S.)
DYNAMIC MODE
Dynamic Mode
T1 & T2
Accuracy
C.C. Mode
C.C. Mode
0.025 ms~10 ms/Res: 1 µs
1 ms~30s/Res: 1 ms
0.025 ms~10 ms/Res: 1 µs
1 ms~30s/Res: 1 ms
1µs /1 ms +100 ppm
1µs /1 ms +100 ppm
Slew Rate
0.16~40 mA/µs
1.6~400 mA/µs
0.32~80 mA/µs
3.2~800 mA/µs
Resolution
0.16 mA/µs
1.6 mA/µs
0.32 mA/µs
3.2 mA/µs
0~1A
0~10A
0~2A
0~20A
2.5 mA
0.5 mA
Current
Resolution
0.25 mA
Current Accuracy
5 mA
±0.4% F.S.
±0.4% F.S.
MEASUREMENT SECTION
Voltage Readback
Range
Resolution
Accuracy
0~125V
0~500V
0~125V
0~500V
4 mV
16 mV
4 mV
16 mV
±(0.05% + 0.05% F.S.)
±(0.05% + 0.05% F.S.)
Current Readback
Range
Resolution
Accuracy
0~1A
0~10A
0~2A
0~20A
0.032 mA
0.32 mA
0.0625 mA
0.625 mA
±(0.1% + 0.1% F.S.)
±(0.1% + 0.1% F.S.)
PROTECTIVE SECTION
Overpower
~31.2W
~312W
~62.4W
Overcurrent
~1.02A
~10.2A
~2.04A
Overtemperature
Overvoltage
~624W
~20.4A
~85°C
~85°C
127.5V
~505V
127.5V
~505V
Current (CC)
~1.1/1A
~11/10A
~2.2/2A
~22/20A
Voltage (CV)
~0V
~0V
~0V
~0V
~50Ω
~1.25Ω
~25Ω
~0.625Ω
GENERAL
Short Circuit
Resistance (CR)
Input Resistance
(Load Off)
Temperature Coefficient
Power
Dimensions
Weight
100kΩ (typical)
100kΩ (typical)
100 PPM/°C (typical)
100 PPM/°C (typical)
Supply from mainframe (115/230 VAC)
Supply from mainframe (115/230 VAC)
3.19” (81 mm)W x 6.75” (172 mm)H
x 19.5” (495 mm)D
6.37” (162 mm)W x 6.75” (172 mm)H
x 19.5” (495 mm)D
8.9 lbs. (4 kg)
16 lbs. (7.3 kg)
Shipping Weight
9.3 lbs (4.2 kg)
18.5 lbs (8.4 kg)
Operating Range
0~40°C
0~40°C
CE
CE
EMC & Safety
Ordering Information
The MML Modular DC Programmable Electronic Load Series
can be ordered as a complete pre-assembled system or by
individual part number.
To order a complete system, use the following system configuration number scheme. Your system will be configured and
tested before shipment.
MML MODEL NUMBER DESCRIPTION
To order individually use the model numbers and descriptions
as listed here:
Mainframe
MML-2
MML-4
Two bay mainframe with manual controller
and RS 232
Four bay mainframe with manual controller
and RS 232
MML-4
1-2-3-X
Mainframe Style
Load Modules
(from left to right)
1
Remote
Programmable
Interface Options
Programming
Interface
Mainframe Option
M9F
Mainframe Style
IEEE-488.2 interface
MML-2 Two bay mainframe with controller
Load Modules
MML-80-20-102
MML-4 Four bay mainframe with controller
80V, 20A, 100W, two channel,
single bay
Load Modules
1
80V, 20A, 100W, two channel, single bay
MML-80-60-301
80V, 60A, 300W, single channel,
single bay
2
80V, 60A, 300W, single channel, single bay
MML-80-120-601
80V, 120A, 600W, single channel,
double bay
3-X*
80V, 120A, 600W, single channel, double bay
4
500V, 10A, 300W, single channel, single bay
MML-500-10-301
500V, 10A, 300W, single channel,
single bay
5-X*
500V, 20A, 600W, single channel, double bay
B
Blank filler panel
MML-500-20-601
500V, 20A, 600W, single channel,
double bay
Programmable Interface Options
0
RS 232 interface standard
Blank filler panel
1
IEEE-488.2 interface
MML-B
Product specifications are subject to change without notice.
* Takes two bays
9250 Brown Deer Road, San Diego, California 92121-2294 • 858/450-0085 • 800/525-2024 • Fax: 858/458-0267
IN EUROPE Kaap Hoorndreef 30 3563 AT Utrecht The Netherlands • +31-30-265-0946 • Fax: +31-30-265-0985
E-mail: [email protected] • Web Site: www.sorensen.com
MML 3/01

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