meter M1 indicates the polarity and magnitude of the input voltage.
Capacitor C3 and resistor R2 filter the resulting dc output voltage for the
recorder output.
Learning Event 4:
DESCRIBE TROUBLESHOOTING THE 845AR NULL DETECTOR
1.
The purpose of troubleshooting is to locate and correct as quickly as
possible any deficiency in operation. The causes and remedies of the more
common troubles that may occur are listed in the troubleshooting chart,
Figure 4-8. Waveforms useful for troubleshooting are given in Figures 4-9
through 4-14.
A complete understanding of the theory of operation and
familiarity with the schematic diagram is the best way to locate and correct
the cause of any malfunction.
Figure 4-8.
Troubleshooting chart
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