Keithley KPCI-3110, Руководство пользователя

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KPCI-3110 and KPCI-3116 User’s Manual Systematic Problem Isolation C-23
CAUTION If you use the +5V board power to energize a voltage divider, ensure
that the +5V board power terminal cannot accidentally short to
ground. A short to ground can damage one or more of the following:
the screw terminal accessory, the board, the computer.
Procedure for the analog input software test
Perform the analog input test as follows:
1. Turn off the host computer.
2. Wire a screw terminal accessory as described under “ Equipment for the analog input soft-
ware test .”
3. Connect the screw terminal accessory, as wired in step 2 , to the KPCI-3110 or KPCI-3116
board J1.
4. Turn on the host computer and boot Windows 95, 98, or NT.
5. Start DriverLINX and your application software.
6. Set your application software to measure and display/report voltages from analog input
channels 00 and 01 at a rate suitable for monitoring DC signals. Configure your system as
follows:
•
The ±5V input range
• Single ended input
7. Based on the displayed/reported voltages in step 6 , act as follows:
• If the measured channel 00 voltage is not 0V and/or if the measured channel 01 voltage
does not agree with the applied voltage, then there could be a problem with the way your
application software program interfaces with DriverLINX or the way it deals with analog
input data from the board. Stop here, and return to the systematic problem isolation
Scheme C, step 1, where you were directed to do analog input software tests.
•
If the measured channel 00 voltage is 0V and the measured channel 01 voltage agrees
with the applied voltage, then your software is treating DC analog input data correctly.
Stop here, and return to the systematic problem isolation Scheme C, step 1, where you
were directed to do analog input software tests.
Analog output software test
This test applies only to a board having analog outputs.This basic analog input test checks
whether your application software correctly sets direct current (DC) analog output voltages. You
set zero volts at the two analog outputs, using your application software. The two output volt-
ages are then measured with a digital voltmeter to verify reasonable DAC offsets. Similarly, a
mid-range voltage is set for each of the two analog outputs and the procedure is repeated.
NOTE During this test, ensure that no user circuits are connected to the
KPCI-3110 or KPCI-3116 board, via the required screw terminal acces-
sory, except for analog input connections specified for the test.
The analog output software test is a software function test, not a calibra-
tion check. If you wish to check and adjust the accuracy, refer to
Section 5 , “ Calibration .”
The analog output software test is only a basic check of your application
software. You are encouraged to perform additional tests that exercise
your software more thoroughly.