Chapter Eight: Maintenance and Troubleshooting Troubleshootin
135
11. Press an arrow key, ( [ ] or
[ ] ), until the system check screen appears.
Ch 1 -9.8799 Volts
SYSCHK
This should produce a negative full scale reading,
±
10%.
12. Connect a short circuit across the 1K resistor and press the [
X
0.01] range selection
key.
The system responds by changing to the x0.01 range.
13. Press the [
ZERO
] key on the 670 instrument front panel.
The system responds by displaying the zero screen.
14. Use the Adjust knob to select ON for the zero enable entry.
15. Press the [
ENTER
] key to start the zeroing process.
You should be able to adjust this control
±
40% of full scale.
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