Chapter 5 Calibration
PCI/PXI-6703/6704 User Manual 5-2 www.natinst.com
accuracy of at least 10 ppm will generally suffice, but be sure to check its
specifications. Also, be sure that no other devices are connected to your
6703/6704 when you calibrate it to ensure that no ground loops can corrupt
the calibration.
Your 6703/6704 device contains a calibration enable bit in a control register
to prevent you from accidentally writing to the calibration channels. Before
you can calibrate the board, you must set this bit. If you are using NI-DAQ,
calibration is enabled by calling the NI-DAQ function
Set_DAQ_Device_Info
(deviceNumber, infoType, infoValue) with
infoType equal to
ND_CALIBRATION_ENABLE
and infoValue equal to
ND_YES
. You may then write to the calibration channels by calling
AO_VWrite
(deviceNumber, chan, voltage) where chan is the calibration
channel number, and voltage is the channel value to be written.
Table 5-1 lists the channel numbers of the calibration channels for the 6703.
Table 5-2 lists the channel numbers of the calibration channels for the 6704.
Table 5-1. 6703 Calibration Channel Numbers
Calibration Channel Channel Number
Voltage offset Channel 16
Voltage gain Channel 17
Table 5-2. 6704 Calibration Channel Numbers
Calibration Channel Channel Number
Voltage offset Channel 32
Voltage gain Channel 34
Current offset Channel 33
Current gain Channel 35
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