National Instruments FlexDMM PXI-4070, Процедура калибровки

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© National Instruments Corporation 35 NI 4070/4072 Calibration Procedure
4. Call
niDMM_ConfigureMeasurement
with the following
parameters:
• Function =
NIDMM_VAL_FREQ
• Range =
1
• Resolution =
0
5. Call
niDMM_ConfigureFrequencyVoltageRange
with
Voltage Range set to
5
.
6. Configure the external source to generate a pulse train with a voltage
of 0 to 5 V and a duty cycle of 50%. The frequency should be set to
1 Hz.
7. Call
niDMM_Read
. Verify that this measurement falls between the
limits listed in Table 23.
8. Repeat steps 6 and 7 with the following modification: Change the
frequency to 20 kHz.
9. Repeat steps 6 and 7 with the following modification: Change the
frequency to 500 kHz.
You have completed verifying the frequency of the NI 4070/4072. Select
one of the following options:
• If you are calibrating an NI 4072 and want to continue verifying other
modes, go to the
Verifying Capacitance and Inductance (NI 4072
Only) section.
• If you do not want to verify other modes and you are performing a
post-adjustment verification, go to the Completing the Adjustment
Procedures section.
• If you do not want to verify any additional modes and you are
performing a pre-adjustment verification, call
niDMM_close
to close
the session.
Verifying Capacitance and Inductance (NI 4072 Only)
This verification procedure only applies to the NI 4072 and requires
additional test equipment, as indicated in the
Additional Requirements for
the NI 4072 section.
Note The NI 4072 inductance accuracy is theoretically verified if the capacitance
accuracy meets the specifications. If you have access to precision inductors, you can verify
the inductance measurements by comparing your results with the published accuracy
specifications.
NI suggests using traceable capacitor standards with low thermal drift. You
can use different verification capacitors to verify each capacitance range.
You can verify two ranges with the same verification capacitor as long as