NI PXI-4070 Calibration Procedure
38
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Verifying Frequency
Note
The frequency of the NI 4070 is not user adjustable. If this verification procedure
indicates that the frequency is out of specification, return the NI 4070 to NI for repair.
To verify the frequency of the NI 4070, complete the following steps:
1.
Remove the calibration cable assembly from the NI 4070.
2.
Connect one end of the coaxial cable to the Pomona 4892 double
banana plug. Tighten the other end of the coaxial cable in the screw
terminal channels 5 and 39 of the TB-2715 terminal block.
Note
Polarity is not important in steps 2 and 3.
3.
Connect the TB-2715 with the coaxial cable attached to the NI 6608,
and plug the Pomona 4892 into the HI and LO terminals of the
NI 4070.
4.
Call
niDMM_reset
to reset the NI 4070 to a known state.
5.
Call
niDMM_ConfigureMeasurement
with the following
parameters:
•
Function
=
NIDMM_VAL_FREQ
•
Range
=
1
•
Resolution
=
0
6.
Call
niDMM_ConfigureFrequencyVoltageRange
with
Voltage Range
set to
5
.
7.
Call
GPCTR_Control
with the following parameters:
•
deviceNumber
=
the device number of the NI 6608 assigned by
Measurement and Automation Explorer (MAX)
•
gpctrNum
=
ND_COUNTER_0
•
action
=
ND_RESET
8.
Call
GPCTR_Set_Application
with the following parameters:
•
deviceNumber
=
the device number of the NI 6608 assigned
by MAX
•
gpctrNum
=
ND_COUNTER_0
•
application
=
ND_PULSE_TRAIN_GNR
9.
Call
GPCTR_Change_Parameter
with the following parameters:
•
deviceNumber
=
the device number of the NI 6608 assigned
by MAX
•
gpctrNum
=
ND_COUNTER_0
