NI 6711/6713/6731/6733 Calibration Procedure
8
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6.
Call
Select_Signal
with
signal
and
source
set to
ND_GPCTR0_OUTPUT
to route the counter signal to the GPCTR0_OUT
pin on the device I/O connector.
7.
Call
GPCTR_Control
with
action
set to
ND_PROGRAM
to start the
generation of the square wave. The device begins to generate a 5 MHz
square wave when
GPCTR_Control
completes execution.
8.
Compare the value read by the counter to the test limits shown in the
appropriate table in the
section. If the value falls
between these limits, the device has passed this test.
9.
Disconnect the counter from the device.
You have now verified the device counter.
Adjusting the NI 6711/6713/6731/6733
This procedure adjusts the AO calibration constants. At the end of each
calibration procedure, these new constants are stored in the factory area
of the device EEPROM. An end-user cannot modify these values, which
provides a level of security that ensures users do not accidentally access or
modify any calibration constants adjusted by the metrology laboratory.
This step in the calibration process calls functions in NI-DAQ and in
the
ni671x.dll
. For further information on the functions in the
ni671x.dll
, refer to the comments in the
ni671x.h
file.
1.
Disconnect all cables to the device. Make sure the device is not
connected to any circuits other than those specified by the calibration
procedure.
2.
To internally calibrate the device, call the
Calibrate_E_Series
function with the following parameters set as indicated:
•
calOP
set to
ND_SELF_CALIBRATE
•
setOfCalConst
set to
ND_USER_EEPROM_AREA
•
calRefVolts
set to
0
3.
Connect the calibrator to the device according to Table 2.
Table 2.
Connecting the Calibrator to the Device
6711/6713/6731/6733 Pins
Calibrator
EXTREF (pin 20)
Output High
AOGND (pin 54)
Output Low
Pin numbers are given for 68-pin connectors only. If you are using a 50-pin connector,
refer to the device documentation for signal connection locations.
