VXI VT1422A - Manual (Page 471)

VT1529A/B Verification & Calibration 469 Appendix C
resistor path. Send the MEAS:VOLT:UNStrained? (@<ch_list>) query to
the VT1422A. The expected return value is ~0.357 V on each channel.
Configure the VT1529A/B for 120
Ω quarter-bridge operation using
the SENS:FUNC:STR:Q120 (@<ch_list>) command. Send the
MEAS:VOLT:UNStrained? (@<ch_list>) query to the VT1422A.
The expected return value is ~0.338 V on each channel.
Configure the VT1529A/B for 350
Ω quarter-bridge operation using
the SENS:FUNC:STR:Q350 (@<ch_list>) command. Send the
MEAS:VOLT:UNStrained? (@<ch_list>) query to the VT1422A.
The expected return value is ~0.301 V on each channel.
Troubleshooting Failures
Check that the Dummy Load is wired and working correctly and firmly
seated in the RJ-45 input connector. If all 8 channels of one block of
VT1529A/B channels are failing, check that the Voltage Source is
connected to the correct terminals on the Bridge Excitation input on the
VT1529A/B.
Test V-5: Dynamic
Strain Output Port
Description
Test the dynamic output gain and offset of the VT1529A/B.
The dynamic strain output voltage should be equal to V
SENSE
times the gain
of the output amplifier, which is fixed at 32.
With V
EXCITATION
= 5.000 V, the Dummy Load attached and the VT1529A/B
configured for the 0
Ω sense path, the nominal dynamic output voltage can
be computed:
for R = 0
Ω, V
sense
= 0.357143 V, V
dynamic
= 11.4286 V
Setting Vexcitation to 0 V, verify the operation of the dynamic output offset
control DAC by setting the offset to +1.0 V. The dynamic output voltage
should be the same as the DAC value, +1.0 V.
Note that the actual measurements will vary based on the actual resistor
values in the dummy load, so these values should be considered approximate
when running this test.
Note
This test does not test the offset or bandwidth specifications.
Setup
The VT1529A/B must be connected to the VT1422A through the VT1539A
SCP. The Dummy Load must be connected to the channel(s) being tested.
The Voltage Source must be connected to the appropriate channel bank
terminals of the Bridge Excitation input on the VT1529A/B.
The Digital Multimeter should be connected to the first channel on the
Dynamic Strain Output Port.