Teledyne 6200A Manual page 180

TAI Model 6200A SO
2. Analog output channel test.
In the DIAGNOSTIC menu on the front panel, there is a test that outputs a step voltage to the 4
analog outputs. This test is useful for calibrating chart recorders and dataloggers attached to the
6200A. The test can also be useful in diagnosing faults in the V/F board.
A. Turn on the instrument.
B. Enter the SETUP-MORE-DIAG menu.
C. Scroll to select the ANALOG OUTPUT test. This causes the 6200A to output a 5 step
voltage pattern to the 4 analog outputs on the rear panel. The status of the test is shown on
the front panel display. The scrolling can be stopped at any voltage by pressing the key
below the changing percentage display. The values are 0-20-40-60-80-100% of whatever
voltage range has been selected. For example the voltages would be 0, 1, 2, 3, 4, 5V if the
5V range had been selected.
D. Use a DVM on each of the analog output channels to confirm the correct voltages.
If the voltages step, but are the wrong values, the V/F board may be out of calibration. See
Section 9.3.3.1 for information on how to calibrate the V/F board.
3. Digital input channel test.
The digital I/O section of the V/F board has 8 input bits and 24 output bits. Two of the 8 input
bits are assigned as calibration controls. See Section 7.7 for information on calibration using
external contact closures.
To test the digital inputs:
A. Turn the 6200A power on.
B. Connect a jumper wire across REMOTE IN terminals 1 and 2 of the rear panel connector
as shown in Figure 2-2.
C. Shortly after closure is made the instrument should switch into zero mode as indicated on
the front panel display.
D. Remove the jumper. Shortly after the jumper is removed the instrument should exit the
zero calibrate mode and enter the HOLDOFF mode. To exit the HOLDOFF mode press
EXIT, which will return the instrument to the SAMPLE mode.
4. Digital output channel test.
There are 24 output bits on the V/F board. The 24 bits are made up of three 8 bit ports. It is
possible for a single 8 bit port or even a single bit within a port to fail.
A quick observational test of the digital outputs is to observe the LED's in the Power Supply
Module (Refer to Figure 9-4 for the location of the LED's in the PSM). A more detailed test is in
the DIAGNOSTIC menu. See Diagnostic tests in Section 9.1.3.
Analyzer Operator Manual, 02164, Rev. G
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