Tektronix VX4730 Manual
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User Manual
VX4730
12-Channel D/A Module
070-9150-04
This document supports firmware version 1.00
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to the Safety Summary prior to
performing service.
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Copyright Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
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WARRANTY
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three
(3) years from the date of shipment. If any such product proves defective during this warranty period, Tektronix,
at its option, either will repair the defective product without charge for parts and labor, or will provide a
replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration
of the warranty period and make suitable arrangements for the performance of service. Customer shall be
responsible for packaging and shipping the defective product to the service center designated by Tektronix, with
shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a
location within the country in which the Tektronix service center is located. Customer shall be responsible for
paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;
b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a
product that has been modified or integrated with other products when the effect of such modification or
integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF
ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS
DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE
PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR
BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF
WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF
SUCH DAMAGES.
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EC Declaration of Conformity
We
Tektronix Holland N.V.
Marktweg 73A
8444 AB Heerenveen
The Netherlands
declare under sole responsibility that the
VX4730 and all options
meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Compliance was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EN 55011
Class A Radiated and Conducted Emissions
EN 50081-1 Emissions:
EN 60555-2
AC Power Line Harmonic Emissions
EN 50082-1 Immunity:
IEC 801-2
Electrostatic Discharge Immunity
IEC 801-3
RF Electromagnetic Field Immunity
IEC 801-4
Electrical Fast Transient/Burst Immunity
IEC 801-5
Power Line Surge Immunity
To ensure compliance with EMC requirements this module must be installed in a
mainframe which has backplane shields installed which comply with Rule B.7.45 of
the VXIbus Specification. Only high quality shielded cables having a reliable,
continuous outer shield (braid & foil) which has low impedance connections to
shielded connector housings at both ends should be connected to this product.
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General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
To Avoid Fire or
Personal Injury
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Ground the Product. This product is indirectly grounded through the grounding
conductor of the mainframe power cord. To avoid electric shock, the grounding
conductor must be connected to earth ground. Before making connections to the
input or output terminals of the product, ensure that the product is properly
grounded.
Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
The common terminal is at ground potential. Do not connect the common
terminal to elevated voltages.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
VX4730 12-Channel D/A Module
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iii
General Safety Summary
Symbols and Terms
Terms in this Manual. These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
Terms on the Product. These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product. The following symbols may appear on the product:
WARNING
High Voltage
iv
Protective Ground
(Earth) Terminal
CAUTION
Refer to Manual
Double
Insulated
VX4730 12-Channel D/A Module
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Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone. Do not perform internal service or adjustments of this
product unless another person capable of rendering first aid and resuscitation is
present.
Disconnect Power. To avoid electric shock, disconnect the mains power by means
of the power cord or, if provided, the power switch.
Use Care When Servicing With Power On. Dangerous voltages or currents may
exist in this product. Disconnect power, remove battery (if applicable), and
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.
VX4730 12-Channel D/A Module
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v
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POWER
MESSAGE
CH A
CH C
CH E
CH G
CH I
CH K
FAILED
ERROR
CH B
CH D
CH F
CH H
CH J
CH L
Gain Adjust A
Zero Adjust A
Gain Adjust C
Zero Adjust B
Zero Adjust C
Gain Adjust E
Zero Adjust D
Zero Adjust E
Logical Addresses
Gain Adjust B
S1
Gain Adjust D
Init Level
S2
Gain Adjust F
S3
MSD LSD
Gain Adjust G
Zero Adjust F
Zero Adjust G
Gain Adjust I
Zero Adjust H
Zero Adjust I
Gain Adjust K
Zero Adjust J
Zero Adjust K
Gain Adjust H
Gain Adjust J
S4
Halt
switch
F1
Gain Adjust L
Zero Adjust L
F2
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+5V
Fuse
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Appendix H: Performance Verification
This procedure verifies the performance of the VX4730 12-Channel D/A
Converter. You may perform the verification in your current VXIbus system if it
meets the minimum requirements specified in Table A–2. It is not necessary to
complete the entire procedure if you are only interested in a specific performance
area. However, the verification of some parameters rely on the correct operation
of previously validated functions so it is best to follow the order presented.
General Information and Conventions
Please familiarize yourself with the following conventions which apply
throughout this procedure:
H
Each test sequence begins with a table, similar to the one below, which
provides information and requirements specific to that section. The item
number appearing after each piece of equipment refers to an entry in
Table A–1, Required Test Equipment, on page A–30. Following the table you
will be given instructions for interconnecting the VX4730 and for checking
performance parameters.
Equipment
Requirements
Digital Volt Meter (item 1)
274 Test Load Assembly (item 2)
Prerequisites
All prerequisites listed on page A–30
H
This procedure assumes that you will be using the National Instruments PC
GPIB controller, and software (NI-488.2M) configured as described in
Table A–3. In the test sequences you will be instructed to issue Interface Bus
Interactive Control (ibic) commands to set up the VX4730-under-test
system. Please refer to the NI-488.2M User Manual for additional information. If you are using a different controller, simply substitute the equivalent
command and response syntax in the test sequences.
VX4730 12-Channel D/A Module
A–29
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Appendix H: Performance Verification
Prerequisites
The verification sequences in this procedure are valid when the following
requirements are met:
H
The VX4730 has been calibrated within the last 12 months
H
The VX4730 module covers are in place and the module is installed in an
approved VXIbus mainframe according to the instructions in Section 2 of the
Operating Manual
H
The VX4730 has passed its power-on self test
H
The VX4730 has been operating for a warm-up period of at least ten minutes
and is operating in an ambient environment as specified in Section 1 of the
Operating Manual
Equipment Required
This Procedure uses traceable signal sources and measurement instruments to
check performance. Table A–1 lists the required equipment. You may use
equipment other than the recommended examples if it meets the minimum
requirements listed.
Table A–1: Required Test Equipment
Item Number and Description
Minimum Requirements
Example
Purpose
1.
Digital Volt Meter (DVM)
5-1/2 digit, 20 VDC range, accuracy >
0.01 %.
FLUKE 8842A
Checking voltage accuracy
2.
274 W Test Load Assembly
(four required)
Male DB-9 Connectors, 4 required
(Tektronix part number 131-1007-00)
Four (identical) assemblies as shown in Figure
A–1
Loading all channels simultaneously at 60 mA per channel
Three assemblies as
shown in Figure A–2
Loading a single channel at
400 mA
274 W, 1%, 0.5 W Resistor, 12
required (Tektronix part number
323-0139-00)
3.
40 W Test Load Assembly
(set of three)
Male DB-9 Connector, 3 required
(Tektronix part number 131-1007-00)
20 W, 0.5%, 5W Resistor, 6 required
(Tektronix part number 308-0584-00)
A–30
VX4730 12-Channel D/A Module
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Appendix H: Performance Verification
3 - 274 1% 0.5 W resistors soldered
between pins 4 & 8, 3 & 7, and 2 & 6.
View of Solder Side
Figure A–1: 274 Test Load Assembly
Soldered between
pins 3 & 7.
Soldered between
pins 4 & 8.
20
20
40 Load Assembly #1
20
40 Load Assembly #2
Soldered between
pins 2 & 6.
20
20
20
40 Load Assembly #3
Figure A–2: 40 Test Load Assemblies
VX4730 12-Channel D/A Module
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A–31
Appendix H: Performance Verification
VX4730-Under-Test Configuration
In order to perform this procedure, the VX4730-under-test must be installed in
an approved VXIbus system. At a minimum, the system must contain the
elements listed in Table A–2.
Table A–2: Elements of a Minimum VX4730 Under-Test System
Item Number and Description
Minimum Requirements
Example
Purpose
1.
VXIbus Mainframe
One available slot for VX4730 in
addition to the Slot 0 controller
Tektronix VX1400A, VX1410
Provides power, cooling, and
backplane for VXIbus modules
2.
Slot 0 Controller
Resource Mgr., Slot 0 Device
Functions, IEEE 488 GPIB Interface
VX4521 Slot 0 Resource Mgr.
Provides Slot 0 functions,
Resource Mgr., and GPIB/
VXIbus interface
3.
VXIbus System Controller
System Talker/Listener/Controller
IBM 486 PC with National
Instruments GPIB PC2A card
& NI-488.2M software and
GPIB Cable (Tektronix part
number 012–0991-00)
System Controller
4.
VX4730-Under-Test
Not applicable
Not applicable
Verify performance
Test System Configuration
Table A–3 describes the VXIbus system configuration which is assumed in this
procedure. If your configuration is different, you do not need to change it; just
note that you will observe your device names and addresses in test results.
Table A–3: Performance Verification System Configuration (Assumed)
Device
GPIB Device
Name
VXI Slot
VXIbus Logical
Address
GPIB Primary
Address
GPIB0
GPIB0
(PC card)
NA
30
VX4521
VX4521
Slot 0
0D hexadecimal
13
VX4730
VX4730
Slot 1
01
1
Test Record
Photocopy the Test Record, and use it to record the performance verification
results for your module.
A–32
VX4730 12-Channel D/A Module
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Appendix H: Performance Verification
VX4730 Test Record
VX4730 Serial Number:
Temperature and Relative Humidity:
Date of Last Calibration:
Verification Performed by:
Certificate Number:
Date of Verification:
VX4730 Performance Tests
VXIbus Interface Checks
Table Command Response
Logical Address, IEEE Address, Slot No., MFG., Model, etc.
1st Response
2nd Response
3rd Response
Passed
Program Command Response
Failed
Self Test
Interrupt SRQ
Voltage Accuracy
Programmed
+16.3835 V
+8.0000 V
0.0000 V
–8.0000 V
–16.3835 V
All 12 Channels (A through L)
driving
rivi a 274
2 4
, 1 %, 0.5
.5 W
load resistor
Maximum
+16.3850 V1
+8.0000 V2
+0.0025 V
–7.9950 V
–16.3755 V
Minimum
+16.3755 V3
+7.9950 V4
–0.0025 V
–8.0000 V
–16.3850 V
Measured
Channel A
S1, pins 4 & 8
Channel B
S1, pins 3 & 7
Channel C
S1, pins 2 & 6
Channel D
S2, pins 4 & 8
Channel E
S2, pins 3 & 7
Channel F
S2, pins 2 & 6
Channel G
S3, pins 4 & 8
Channel H
S3, pins 3 & 7
Channel I
S3, pins 2 & 6
Channel J
S4, pins 4 & 8
Channel K
S4, pins 3 & 7
Channel L
S4, pins 2 & 6
VX4730 12-Channel D/A Module
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A–33
Appendix H: Performance Verification
Current Drive, Single Channel
±16.3835 V into a 40 , 1 %, 10.0 W load
+16.0000 V Minimum
Channel A
Load Assembly #1
S1, pins 4 & 8
Channel B
Load Assembly #2
S1, pins 3 & 7
Channel C
Load Assembly #3
S1, pins 2 & 6
Channel D
Load Assembly #1
S2, pins 4 & 8
Channel E
Load Assembly #2
S2, pins 3 & 7
Channel F
Load Assembly #3
S2, pins 2 & 6
Channel G
Load Assembly #1
S3, pins 4 & 8
Channel H
Load Assembly #2
S3, pins 3 & 7
Channel I
Load Assembly #3
S3, pins 2 & 6
Channel J
Load Assembly #1
S4, pins 4 & 8
Channel K
Load Assembly #2
S4, pins 3 & 7
Channel L
Load Assembly #3
S4, pins 2 & 6
–16.0000 V Maximum
1
The maximum expected voltage is the programmed value (+16.3835 V) plus the monotonic specification (0.0015 V), and
minus the loss due to the minimum output impedance (0.00 V).
2
The maximum expected voltage is the programmed value (+8.0000 V) plus the monotonic specification of 0.0015 V, minus
the loss due to the minimum output impedance).
3
The minimum expected voltage is the programmed value (+16.3835 V) minus the monotonic specification (0.0015 V), the
loss due to the maximum output impedance ( 0.122 W × 60.0 mA = 0.0073 V), and the DB9 connector (0.0007 V).
4
The minimum expected voltage is the programmed value (+8.0000) minus the monotonic specification of 0.0015 V, the
loss due to the maximum output impedance ( 0.122 W × 30.0 mA) and the DB9 connector.
A–34
VX4730 12-Channel D/A Module
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Appendix H: Performance Verification
Self Test
The VX4730 includes a built-in self test capability (BITE) which is automatically executed each time the power is turned on and when the Internal Self Test
(IST) command is issued. The self test uses internal routines and circuitry to
confirm basic functionality and proper adjustment. No test equipment is
required.
During BITE, all channel outputs are first isolated from the front panel connectors. Then each output is internally compared with another output, used as a
reference, to assure accuracy to within 3% of the programmed voltage. Two
comparisons of each channel using separate reference channels are performed to
increase the test reliability. Each comparison is performed over the entire voltage
range from –16.3 V to + 16.3 V.
In addition to BITE, the VX4730 incorporates a relay fault detection feature. If a
relay fails to open or close as programmed with CLS or OPN commands, the
ERROR light will turn on, an error message will be created in the message
queue, and a Request True interrupt will be generated.
Following the VXIbus system startup sequence, the green PWR light on the
front panel indicates that all power supplies are operational. If a +5 V, or ± 24 V
bus fails, or the associated fuse opens, the PWR light will be off. Also, the
FAILED light will be on, and SYSFAIL* will be asserted indicating a module
failure.
NOTE. If you experience any error indications from the Slot 0 Resource Manager,
the VX4730-under-test, or other VXIbus module, investigate and correct the
problem before proceeding. Common items to check are logical address conflicts
(primary and secondary; see Table A–3), breaks in the VXIbus daisy chain
signals, improper seating of a module, loose GPIB cable, improperly set Slot 0
single-step switch (VX4521), or loose or blown fuses.
Performance Verification Tests
This procedure verifies the performance of the VX4730. The test sequences
contain setup instructions for the example equipment listed in Table A–1, page
A–30. You may use equipment other than the recommended examples if it meets
the minimum requirements listed. The order of test sequences has been chosen to
minimize system setup. Although not essential, it is recommended that you
follow the order presented, as some tests rely on previously verified parameters.
VXIbus Interface
This sequence verifies that the VX4730 configures correctly and communicates
properly with your system controller.
VX4730 12-Channel D/A Module
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A–35
Appendix H: Performance Verification
Equipment
Requirements
No additional test equipment is required for this sequence.
Prerequisites
All prerequisites listed on page A–30
1. Verify the system configuration by sending the TABLE command to the
Slot 0 Resource Manager and confirm the responses shown in table A–4.
Your configuration may not be identical, but the responses should be similar.
NOTE. If you are using National Instruments NI-488.2 software you may wish to
select buffer 1 display mode to allow more comfortable viewing of the ASCII
response. Just type ".&&%, .
Table A–4: VXIbus System Configuration
Command to Type
Correct Response to Verify
("(#
".&&%, ("&(*$ ("/,- -!")%
(",$ )+- ' . .
)+- ' 2. Verify that the power-on self test passed and that there are no error messages
pending:
("&(*$ (",$ (0,0, NO ADDITIONAL ERRORS TO REPORT)
A–36
VX4730 12-Channel D/A Module
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Appendix H: Performance Verification
3. Verify the VX4730 interrupt capability with the following steps:
NOTE. Make sure your Slot 0 controller and the VX4730 are set to the same
interrupt level (see Operating Manual for switch location). Also, if you are using
National Instruments NI-488.2 software, make sure Auto Serial Polling is
disabled (via ibconf) to prevent the SRQ from being reset prior to visual
verification.
a. Enable the generation of the VXIbus Request True event when an error
condition is detected and then force an error condition by programming
an out-of-range voltage (The zero length read serves to unaddress the
Slot 0 controller allowing it to then detect the VXIbus interrupt and to
assert the SRQ):
(Observe red light on the VX4730)
(Observe VX4521 indicates S in 2nd digit on front panel)
b. Check that the VX4730 light on and that the Slot 0 controller
(VX4521) displays an S in the second digit of the front panel display,
indicating that an SRQ is pending.
c. Perform a serial poll with the VX4730 and check that the Slot 0
Resource Manager is no longer indicating an active SRQ (note a return
value of 40 h):
(Observe 40 h return value and S no longer asserted)
d. Read two responses from the VX4730 to clear the error messages:
(Observe: , no light)
(Observe: )
Check Voltage Accuracy
This test sequence verifies the accuracy of the programmed voltage level at the
rated drive current for all channels driven simultaneously.
Equipment
Requirements
Digital Volt Meter (item 1)
274 Test Load assembly, four required (item 2)
Prerequisites
All prerequisites listed on page A–30
VX4730 12-Channel D/A Module
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A–37
Appendix H: Performance Verification
1. Connect the four 274 test load assemblies to the front panel DB9
connectors (S1, S2, S3, and S4).
2. Connect the positive and negative DVM test leads across the 274 test load
resistor attached to S1, pins 4 and 8 respectively.
3. Set the VX4730 to its power-on default state and then to generate
16.3835 VDC on all twelve channels simultaneously:
4. Check that the Channel A output voltage is within the limits specified in the
Test Record.
5. Move the DVM test leads, in turn, to each of the remaining eleven channels
and check that the output voltage is within the limits specified on the Test
Record.
6. In the same way, check the additional voltages in Table A–6.
Table A–5: DC Accuracy (All Channels Driving 274 W)
Command to Send
DC Voltage to Verify on Each Channel
(step 3 repeated for table continuity)
Maximum Drive Current
for Single Channel
This test sequence verifies that each channel is individually capable of sourcing
or sinking more than 400 mA into a resistive load when only a single channel is
being driven.
Equipment
Requirements
Digital Volt Meter (item 1)
40 Test Load Assembly Set (item 3)
Prerequisites
All prerequisites listed on page A–30
1. Connect the 40 Test Load #1 to the S1 front panel connector (Ch A).
2. Connect the DVM test leads across the 40 test load.
A–38
VX4730 12-Channel D/A Module
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Appendix H: Performance Verification
3. Set the VX4730 to its power-on default state, to generate 16.3835 VDC on
Ch A, and to close all output relays. Then check the output voltage against
the minimum specified in the Test Record.
(Check Ch A against Test Record)
4. Reset the VX4730 to generate –16.3835 V and again check the output
voltage as specified in the Test Record.
(Check Ch A against the Test Record)
5. Move the 40 Test Load #1 to the S2 front panel connector (Ch D) and
reattach the DVM test leads. Set the VX4730 to generate 16.3835 V on Ch D
and check the voltage against the Test Record. Then reset the output voltage
to –16.3835 V and again check the voltage.
(Check Ch D against Test Record)
(Check Ch D against Test Record)
6. In a similar manner, check the additional channels using the three 40 Test
Load Assemblies and commands in Table A–6.
VX4730 12-Channel D/A Module
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A–39
Appendix H: Performance Verification
Table A–6: DC Current Drive (Single Channel Driving 40 W)
40 W Load Assembly No. and
Front Panel Output Connector No.
Commands to Send
Channel
to Check
40 W Load #1 on S3
G
40 W Load #1 on S4
J
40 W Load #2 on S1
B
40 W Load #2 on S2
E
40 W Load #2 on S3
H
40 W Load #2 on S4
K
40 W Load #3 on S1
C
40 W Load #3 on S2
F
40 W Load #3 on S3
I
40 W Load #3 on S4
L
This completes the VX4730 verification procedure.
A–40
VX4730 12-Channel D/A Module
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WARNING
The following servicing instructions are for use only by qualified personnel. To
avoid injury, do not perform any servicing other than that stated in the operating
instructions unless you are qualified to do so. Refer to all Safety Summaries before
performing any service.
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Appendix I: Adjustment Procedure
In order to meet its published specification, the VX4730 must be adjusted every
twelve months. At the time of shipment, the module was adjusted at room
temperature (25o C) to within an absolute no-load accuracy of 1.5 mV of the
programmed voltage (0.5 mV adjustment error plus 1 mV linearity error).
Subsequent adjustment should be performed at the temperature at which the
module will be operating. If this is not feasible, or the module will be operating
over a wide temperature variation, consult the temperature drift specification in
the Operating Manual.
The following skills are required to perform this procedure:
H
Thorough knowledge of test instrument operation and proper measurement
techniques
H
Knowledge of VXIbus system components and command language
programming
H
Ability and facility to construct interconnections and fixtures as needed to
perform the procedure
General Information and Conventions
This procedure assumes that you will be using the National Instruments
PC-GPIB controller and software (NI-488.2M) in a system configuration as
described in Table A–9. The adjustment sequence will instruct you to issue the
corresponding Interface Bus Interactive Control (ibic) commands to set up the
VX4730. Please refer to the NI-488.2M User Manual for additional information.
If you are using a different controller, simply substitute the equivalent commands
in the adjustment steps.
Prerequisites
Proper adjustment of the VX4730 may be achieved when the following
requirements are met:
H
The VX4730 module covers are in place and the module is installed in an
approved VXIbus mainframe according to the instructions in Section 2 of the
Operating Manual
H
The VX4730 has passed its self test and has been operating for a warm-up
period of 10 minutes in an ambient environment as specified in Section 1 of
the Operating Manual
VX4730 12-Channel D/A Module
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A–41
Appendix I: Adjustment Procedure
NOTE. The module may be operated on an extender board to allow access to the
adjustments.
Equipment Required
This procedure uses traceable signal sources and measurement instruments.
Table A–7 lists the required equipment however, you may use equipment other
than the recommended examples if it meets the minimum requirements listed.
Table A–7: Required Adjustment Equipment
Item Number and Description
Minimum Requirements
Example
Purpose
1.
Digital Volt Meter (DVM)
5-1/2 digit, 100 VDC range, accuracy >
0.002 %.
FLUKE 8842A
Checking voltage accuracy
2.
VXIbus Extender Board
Full length C size VXIbus extension
Tektronix 73A–850
Providing adjustments access
System Requirements
In order to perform this procedure, the VX4730 must be installed in an approved
VXIbus system. At a minimum, the system must contain the elements listed in
Table A–8.
Table A–8: Elements of a Minimum VX4730 Adjustment System
Item Number and Description
Minimum Requirements
Example
Purpose
1.
VXIbus Mainframe
One available slot, for the VX4730
in addition to the Slot 0 controller
Tektronix VX1400A
Power, cooling, and backplane
for VXIbus modules
2.
Slot 0 Controller
Resource Mgr., Slot 0 Functions,
IEEE 488 GPIB Interface
VX4521 Slot 0 Resource Mgr.
Slot 0 functions, Resource
Mgr., GPIB-VXIbus interface
3.
System Controller
286 Processor; Talker/Listener/
Controller GPIB card, and software
IBM 486 PC with National
Instruments GPIB PC2A card
& NI-488.2M software, GPIB
cable (Tektronix part number
012–0991-00)
System Controller
A–42
VX4730 12-Channel D/A Module
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Appendix I: Adjustment Procedure
System Configuration
Table A–9 describes the VXIbus system configuration which is assumed in this
procedure. If your configuration is different, you do not need to change it, just
note that you will observe your device names and addresses in place of those
recommended in Table A–9.
Table A–9: VXIbus Adjustment System Configuration
Device
GPIB Device
Name
VXI Slot
VXIbus Logical
Address
GPIB Primary
Address
GPIB0
GPIB0
(PC card)
NA
30
VX4521
VX4521
Slot 0
0D (hexadecimal)
13
VX4730 on extender
VX4240
Slot 1
01
1
Adjustment Procedure
Each channel of this module must be individually adjusted. There is one gain
adjustment and one zero offset adjustment for each channel. Labeled holes are
provided in the module’s EMC shield to access the adjustments. Adjustment
locations are shown in Figure 1 on page 1–3.
NOTE. It is important to note the effects of cable resistance versus load current
and temperature on the module outputs. For example, the resistance of the
Tektronix 73A–732P cable is 34.4 /km. This corresponds to 2.0 mV per meter
voltage drop at 60 mA output current. If practical, a higher degree of overall
system accuracy can be obtained if the readings are taken from the end of the
terminated cable that will be used to drive the Device Under Test load during
normal operations.
1. Connect the DVM to the output connector and pins associated with the
channel to be adjusted (Please refer to the Test Record in the Performance
Verification Procedure for the output connector pin definitions).
2. Reset all VX4730 outputs to 0.000 VDC and close all output relays with the
following commands:
If the module has been ordered with Option 1M (MATE TMA), use the CIIL
commands to reset all outputs to 0.000 VDC and close all output relays:
VX4730 12-Channel D/A Module
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A–43
Appendix I: Adjustment Procedure
...
...
3. Adjust the zero offset adjustment for each channel in turn, for a DVM
reading of 0.0000 ±0.0001 VDC.
4. Set the VX4730 for an output voltage of 16.382 on all channels with the
following command:
If the module has been ordered with Option 1M (MATE TMA), use the CIIL
commands to set all outputs:
...
5. Adjust the gain adjustment for each channel in turn, for a DVM reading of
16.3820 ±0.0005 VDC.
6. With the following command, set the VX4730 for an output voltage of
–16.382 VDC on all channels and verify each channel in turn to be
–16.382 ±0.001 VDC:
If the module has been ordered with Option 1M (MATE TMA), use the CIIL
commands to set all outputs and then verify each channel:
A–44
VX4730 12-Channel D/A Module
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Appendix I: Adjustment Procedure
...
NOTE. When the readings are taken from the end of a cable connected to the
output connector rather than directly from the connector, accuracy may be
affected by interference from external sources. If the output voltage of the
channel being adjusted fails to indicate –16.382 ±0.001 VDC, repeat steps 2
through 6. If the readings are being taken directly from the front panel connector
and cannot be adjusted to within the tolerances specified, the module is
defective. Contact Tektronix at 1–800–Tek–4VXI.
This completes the VX4730 adjustment procedure.
VX4730 12-Channel D/A Module
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A–45
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