National Instruments PXI-4070 6 1/2 Digit FlexDMM, Calibration Procedure

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NI PXI-4070 Calibration Procedure 54 ni.com
Adjusting Current Modes
If you do not use the current modes (DC and AC), or the accuracy is
insignificant for your application, you can skip this section and select one
of the following options:
• If you skip this section and you want to verify the new calibration
coefficients before saving them to the EEPROM, repeat the
Verification Procedures section (except for Setting Up the Test
Equipment ).
• If you skip this section and you do not want to verify the new
calibration coefficients, go to the
Completing the Adjustment
Procedures section.
To adjust the current modes of the NI 4070, complete the following steps:
1. Reset the calibrator.
Caution Step 2 must be performed correctly to avoid shorting on unconnected spade lugs.
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. Connect a banana-to-banana cable or a wire (AWG
≤
22) between the
the AUX CURRENT binding post and the SENSE HI binding post of
the calibrator.
4. Call
niDMM_ConfigureMeasurement
with the following
parameters:
• Function =
NIDMM_VAL_DC_CURRENT
• Range =
0.02
5. Call
niDMM_Read
to configure the NI 4070 for a current mode before
applying current.
6. Output 20 mA on the calibrator with the current output set to
AUX
.
7. Call
niDMM_CalAdjustGain
with the following parameters:
• Mode =
NIDMM_VAL_DC_CURRENT
• Range =
0.02
• Input Resistance =
NIDMM_VAL_RESISTANCE_NA
• Expected Value =
0.02
8. Output –20 mA on the calibrator with the current output set to
AUX
.
9. Call
niDMM_CalAdjustGain
with the following parameters:
• Mode =
NIDMM_VAL_DC_CURRENT
• Range =
0.02