Peak Hold Circuit - Wahl Heat-Prober 392AHP User Manual

Heat-Prober

6.7 Peak Hold Circuit

1. To enable the PEAK HOLD mode, depress the forward/ upper position of the Power
Switch. Adjust calibrator or decade box for an upscale temperature reading allowing the display
to stabilize.
2. When display has stabilized to a temperature reading appropriate for the
calibrator/decade box setting, move the calibrator/decade box to the position or resistance that
represents a lower temperature, and verify that the peak temperature of Step 1 is held.
NOTE: This is a digital peak that is computed by the peak hold circuit, and as such will not drift
up or down as may happen with analog circuits. What may happen is that the calibrator or
decade box can momentarily "go open" as it is switched between settings. The meter may see
this and jump up scale and retain a higher reading. When this happens, switch meter off and
back on to peak hold setting, and the reading will be restored.
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Platinum-RTD Thermometers User Manual
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