AO Waveform Calibration Procedure for NI-DAQmx
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These steps are described in detail in the following sections. Because a
complete verification of all of the device’s ranges can take some time,
you may wish to verify only the ranges of interest to you.
Initial Setup
NI-DAQmx automatically detects all AO devices. However, for the driver
to communicate with the device, it must be configured in NI-DAQmx.
To configure a device in NI-DAQmx, complete the following steps:
1.
Install the NI-DAQmx driver software.
2.
Power off the computer that will hold the device, and install the device
in an available slot.
3.
Power on the computer, and launch Measurement & Automation
Explorer (MAX).
4.
Configure the device identifier and select
Self-Test
to ensure that the
device is working properly.
Note
When a device is configured with MAX, it is assigned a device identifier. Each
function call uses this identifier to determine which DAQ device to calibrate.
AO Verification Procedure
Verification determines how well the DAQ device is meeting its
specifications. By performing this procedure, you can see how your device
has operated over time. You can use this information to help determine the
appropriate calibration interval for your application.
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.
Analog Output Verification
This procedure checks the performance of the analog output. Check
measurements using the following procedure:
1.
Connect your DMM to AO 0 as shown in Table 1.
Table 1.
Connecting the DMM to AO <0..7>
Output Channel
DMM Positive Input
DMM Negative Input
AO 0
AO 0 (pin 22)
AO GND (pin 56)
AO 1
AO 1 (pin 21)
AO GND (pin 55)
AO 2
AO 2 (pin 57)
AO GND (pin 23)
