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Thus the reading is independent of test current variations
caused by changes in battery voltage, or by different test
lead resistance.
The digital meter has an “auto-zero’ circuit that normally
holds any zero offset drift to one or two least counts, and
a dual-slope integrating converter that is tuned to reject
line frequency interference, either 50 Hz or 60 Hz.
The battery charger supplied with models having internal
rechargeable batteries is a constant-current type specifically
intended for use with nickel-cadmium batteries. There are
two charging circuits: one that supplies 0.4A to charge the
display battery, and another with two branches that
supplies 0.7A to each of the two measuring circuit
batteries. These current values are the battery
manufacturers’ recommended “ten-hour rates” and
represent a safe charging level that will not damage the
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