Fluke 8842a instruction manual Waveforms at TP102 for Several Inputs on 2V DV Range

8842A

Instruction Manual

f6-17.wmf

Figure 6-17. Waveforms at TP102 for Several Inputs on 2V DV Range

Since power supply problems can produce symptoms in many different sections of the instrument, the first step in troubleshooting any problem should usually be a quick check of the power supplies. For each power supply (TP801-TP806), check the level with a voltmeter and check for ripple with an ac-coupled oscilloscope. The dc voltages should be within the limits given in Table 6-23.

If a supply is too high, either its three-terminal regulator has failed or a fault elsewhere in the instrument has shorted two supplies together. After repairing such a problem, make certain that nothing else was damaged by the overvoltage.

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