Keithley KPCI-3101 Series, User Manual

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C-14 Systematic Problem Isolation KPCI-3101 — KPCI-3104 Series User’s Manual
c. Reconnect all external circuits. If you left external circuits connected to the screw termi-
nal accessory, connect the accessory to your board. If you disconnected external circuits
from the screw terminal accessory, reconnect them and the accessory as discussed in
Section 3 , “ Installation and Configuration .”
d. Turn on the computer and start your data acquisition software.
2. Repeat the task that you were doing with your data acquisition system when the problem
occurred, and observe the performance.
3. Based on the results of step 2, do one of the following:
•
If the system now performs satisfactorily, you have successfully isolated and corrected
the problem.
• If the system still does not perform satisfactorily, then the cause of your problem may be
outside the scope of these diagnostics. Read the instructions in
Section 6 “Technical sup-
port ,” and then contact Keithley for help in isolating the cause of your problem.
Specified hardware I/O tests
The tests in this section check whether the analog and digital I/O of the board work properly.
The I/O are tested using proven DriverLINX utilities, thereby bypassing any unresolved applica-
tion software issues. These tests are intended to be used when specified in the preceding “
Speci-
fied software I/O tests ” procedure. However, they may also be used at any time for general
functional checks of your KPCI-3101–4 board.
NOTE During these tests, disconnect all user circuits from board, except for
connections specified in individual test procedures.
Analog input hardware test
The analog input test checks whether the analog inputs, particularly the instrumentation ampli-
fier and A/D converter, are working correctly. In this test, a voltage applied to KPCI-3101–4
channel 01 is measured using the on-screen digital voltmeter utility that is supplied with Driver-
LINX. In the same way, channel 00 is grounded and checked for offset voltage. One voltage
measurement and one grounded-input measurement are sufficient because of the following:
•
All analog channels are connected to the same instrumentation amplifier and A/D converter,
via the multiplexer.
• The multiplexer is unlikely to be a problem source.
Both the voltage and grounded-input measurements are made in the single-ended input mode.
NOTE During this test, ensure that no user circuits are connected to the
KPCI-3101–4 board, except for analog input connections specified for
the test.
The analog input test is a functional test, not a calibration check,
although readings from a properly calibrated board should correspond
to a known test voltage within the accuracy specifications of the board.
If you wish to check and adjust the accuracy, refer to
Section 5 ,
“ Calibration .”