NI 6738/6739 Calibration Procedure
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© National Instruments
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7
Verification
The following performance verification procedures describe the sequence of operation and
provide test points required to verify the NI 6738/6739. The verification procedures assume that
adequate traceable uncertainties are available for the calibration references.
The verification procedure is divided into the major functions of the device. Throughout the
verification process, use the tables in the
section to determine if your device needs
to be adjusted. These tables show all acceptable settings for the device.
Analog Output Verification
The NI 6738 has 32 analog outputs, AO <0..31>. The NI 6739 has 64 analog outputs, AO <0..63>.
Note
Table 3,
NI 6738/6739 Analog Output Values
, is based upon the most recent
edition of the specifications document for your device. Refer to the most recent
specifications document online at
Note
The test limits used in this document assume a maximum temperature drift of
±10 °C from the last external calibration, and a maximum temperature drift of ±1 °C
from the last self-calibration. Refer to the
Checking Device Temperature Changes
section for more information and instructions on reading your device temperature and
comparing it against the device temperature during the last external calibration.
Caution
Do not perform analog output verification and counter verification
simultaneously, as the multiple signal connections will produce noise that can affect
measurements.
Complete the following steps to check analog output measurements.
1.
Connect your DMM to AO 0 as shown in Table 2,
.
Note
If you are using the NI 4070, ensure that it is set to the 10 V range.
Table 2.
Analog Output Connections
Analog
Output
*
DMM
Positive Input
Negative Input
AO 0
Connector 0, AO 0 (pin 10)
Connector 0, AO GND 0/1 (pin 11)
AO 1
Connector 0, AO 1 (pin 44)
Connector 0, AO GND 0/1 (pin 11)
AO 2
Connector 0, AO 2 (pin 45)
Connector 0, AO GND 2/3 (pin 39)
AO 3
Connector 0, AO 3 (pin 12)
Connector 0, AO GND 2/3 (pin 39)
AO 4
Connector 0, AO 4 (pin 13)
Connector 0, AO GND 4/5 (pin 41)
