Adjusting Ac Voltage (Ac- And Dc-Coupled) Modes - National Instruments PXI-4070 Manual

Adjusting AC Voltage (AC- and DC-Coupled) Modes

Note If you do not use the AC voltage modes for any measurements, or the accuracy of
these modes is irrelevant, you can skip this section in the calibration procedure and go
directly to the
Caution Step 2 must be performed correctly to avoid shorting or electrical shock from
high voltage on unconnected spade lugs.
Calibrator Output
Iteration Amplitude
1 50 mV
50 mV
2 500 mV
500 mV
© National Instruments Corporation
Adjusting Current Modes
To adjust the AC voltage of the NI 4070, complete the following steps:
1. Reset the calibrator.
2. Connect the calibration cable assembly with the connector block
plugged into the NI 4070 and with the spade lugs connected to the
appropriate binding posts on the calibrator, as described in Figure 3
and Table 1.
3. Refer to Table 8 for the appropriate calibrator output and parameter
values as you complete the following steps:
a. On the calibrator, output the value listed under Calibrator Output
in Table 8 for the current iteration.
b. Call
niDMM_CalAdjustGain
NIDMM_VAL_AC_VOLTS
in Table 8 for the current iteration.
c. Call
niDMM_CalAdjustGain
NIDMM_VAL_AC_VOLTS_DCCOUPLED
4. Repeat step 3 for each of the remaining iterations listed in Table 8.
Table 8. niDMM_CalAdjustGain Parameters
Frequency Mode
1 kHz NIDMM_VAL_AC_VOLTS
1 kHz NIDMM_VAL_AC_VOLTS
_DCCOUPLED
1 kHz NIDMM_VAL_AC_VOLTS
1 kHz NIDMM_VAL_AC_VOLTS
_DCCOUPLED
section.
with Mode set to
. Set the remaining parameters as shown
again, changing Mode to
niDMM_CalAdjustGain Parameters
Range
(V)
0.05
0.05
0.5
0.5
47
.
Expected
Input Resistance
NIDMM_VAL_
1_MEGAOHM
NIDMM_VAL_
1_MEGAOHM
NIDMM_VAL_
1_MEGAOHM
NIDMM_VAL_
1_MEGAOHM
NI PXI-4070 Calibration Procedure
Value
0.05
0.05
0.5
0.5