miniLAB 1008 User's Guide
Calibrating and Testing the Device
Running a loop back test
Run the loop back test to verify that a single analog input is functional. This test also
verifies that the onboard signal source—such as a digital output—is functional. In this
test, you wire a connection between a digital output, analog output, or external signal
source, and an analog input. To perform the loop back test, do the following:
1.
2.
3.
Select the input channel (CH 0 to CH 3, or CH 0 to CH 7 in single-ended mode),
signal source (DIO0 to DIO3, DAC0, DAC1, or External,) and range to test.
Connect a wire between the pins. Use the wire illustration at the bottom of the
dialog as a reference for the pin numbers to connect.
Verify that the specified waveform appears in the plot area.
In the example below, pin 1 (signal CH0 IN) is connected to pin 16 (signal DIO0).
This connection generates a square wave in the plot area.
When you change the input channel or signal source, the wire illustration dynamically
updates the pin numbers to connect, and the plot area displays the data from the selected
input channel.
Running a scan test
Run the scan test to verify that a range of analog inputs is functional. This is a more
advanced test than the loop back test, in that it also exercises the pacer circuit. In this
test, you apply a low frequency signal to one or more analog input channels. The UL
function
cbAInScan()
reads the A/D voltage of each channel in the scan, and outputs
the data as a waveform in the plot area. The data is also output to a table.
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