National Instruments NI 6703, Процедура калибровки, Страница: 5 / 16

© National Instruments Corporation 5 NI 6703/6704 Calibration Procedure for Traditional NI-DAQ
2. Adjust the NI 6703/6704 calibration constants with respect to a
known voltage source. This step is described in the
Adjusting the
NI 6703/6704 section.
3. Reverify the performance to ensure that the NI 6703/6704 is operating
within its specifications after adjustment.
Verifying the Performance of the NI 6703/6704
Verification determines how well the device is meeting its specifications.
The verification procedure is divided into the major functions of the device.
Throughout the verification process, refer to the tables in the
Specifications
section to see if the device needs to be adjusted.
Verifying Voltage Output
This procedure verifies whether the output of voltage channel 0 is within
specifications. Because of the channel-to-channel matching of the
NI 6703/6704 voltage channels, if voltage channel 0 is operating within
specifications, all the voltage channels should be operating within
specifications.
If you want to verify the channels individually, this procedure can be easily
expanded to verify all the voltage channels. Perform the procedure once for
each value of the channel parameter from 0 to 15. Each time you repeat the
procedure, you also need to connect the appropriate channel to the DMM.
Refer to the
PCI/PXI-6703/6704 User Manual at
ni.com/manuals
for the
pin numbers corresponding to each channel. To verify the voltage output,
read the
Equipment and Other Test Requirements section, and complete the
following steps:
1. Call the
Get_Cal_Date
function contained in
ni6704Cal.dll
to
determine the previous calibration date of the NI 6703/6704.
2. Connect the DMM to the NI 6703/6704 as shown in the following
table.
3. Place the DMM in voltage mode.
4. Call
AO_VWrite
to generate 9.9 V on voltage channel 0. Set the
following parameters:
• chan : 0
• voltage : 9.9
Signal Name Description NI 6703/6704 Output DMM Input
VCH0 Voltage Channel 0 Pin 34 High
AGND0 Analog Ground 0 Pin 68 Low