Page 8
Digit 8 : Output error modes
The 9814 will display ‘OP ERROR’ (output error) when it is unable to drive the load with
the selected output.
NOTE
Output errors are not detected on the 10mV and 100mV ranges.
The user can select one of 4 ways in which the 9814 will respond to an output error de-
tailed below.
Mode 1. The output will be set to zero immediately and ‘OP ERROR’ displayed. To
continue using the 9814, the fault must be rectified and the output re-selected. The dis-
play will then show the re-selected value.
Mode 2. The output will be set to zero immediately and ‘OP ERROR’ displayed.
The output will be reinstated if the overload disappears and the previous output value
displayed.
Mode 3. Upon detection of an error, the 9814 will wait for 0.5 seconds before setting the
output to zero and displaying ‘OP ERROR’. The fault must be rectified and the output re-
selected.
Mode 4. The 9814 will continue to drive the output circuits and ‘OP ERROR’ will be dis-
played after 0.5 seconds.
Self Test Mode
To select self test mode, set all 8 IEEE switches (on rear of 9814) to the ON position be-
fore switching on the instrument.
When switched on, the 9814 will carry out an internal test sequence as follows. Each
segment of the 8 digit display will light in turn, followed by all the front panel LED’s (with
the exception of the F.S., ZERO, + & - LEDS which are not tested). If no errors are de-
tected, the word PASS will appear on the display.
If an error is detected, the word ERROR followed with a number from 1 to 6 will be dis-
played. The meaning of these numbers is explained in Table 4.3
Table 4.3. Fault displays
NUMBER FAULT REPLACE
1 RAM Processor Board
2 GPIA IEEE Board
4 PIA Processor Board (IC1 6821)
5 PIA Processor Board (IC2 6821
6 CAL RAM Calibration RAM (X2816)
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