Fluke 8024B - Page 35

8024B
———+-— PEAK HOLD
VALUE
PEAK HOLD
Figure 2-12. Peak Hold Operation
5. Measure the voltage on the side contact (bottom of hole) of the connector
(approximately +2.90V).
6. Set the PEAK HOLD switch to ON and momentarily touch the test lead to the
side contact.
7. The reading should be the same as step 5, within a few digits.
8. False readings may result if the range or function switches are changed while
the PEAK HOLD switch is set to ON. To avoid these errors, reset the PEAK
HOLD circuit after each range or function change.
9. Static electricity and noise pickup may cause errors when using the PEAK
HOLD function. While the PEAK HOLD switch is ON, avoid touching the probe
tips to fingers or other objects which may contain a static charge. The potential for
noise pickup is worst whenever the test leads are open circuited. This is particularly
true on the 200 mV, 2V and 2 mA ranges. Refer to AC/ DC current measurement
section ofp MEASUREMENT TECHNIQUES for additional information.
NOTE
For DC voltages and currents, the peak hold function measures the “most
positive” value of the input waveform. If the “most positive” excursion of
the waveform is negative with respect to common, a negative sign will be
displayed, i.e., when a negative sign is display, the measured value is not the
negative peak, but is, instead the least negative (or most positive) portion of
the applied waveform.
10. PEAK HOLD accuracy may be affected by mechanical! shock. If your 8024B
has suffered mechanical shock during a peak measurement, reset the PEAK
HOLD circuit and repeat the measurement.