Decibel Measurement
The operation of the DB range (see figure 5) is essentially the same as that described under Output Voltage
Measurement. The meter is calibrated in DB across a 500 ohm impedance.
MAINTENANCE
General
This instrument should require very little, if any, maintenance due to its inherent ruggedness and ability to withstand
electrical surges. Care should be taken, however, to protect the instrument from any severe mechanical or electrical
shock.
When in doubt of the voltage or current present in the circuit, always use the highest range and then proceed downward
until the meter reads somewhere between 1/5 and full scale.
Battery Replacement
When it is no longer possible to zero the meter on the R x 1 and R x 100 ranges by rotating the ZERO OHMS knob
with the test leads shorted, the single, large 1.5 volt battery should be replaced.
When it is no longer possible to zero the meter on the R x 10K range by rotating the ZERO OHMS knob with the test
leads shorted, the four small 1.5 volt batteries should be replaced.
Both types of batteries are standard and readily obtainable. The large battery is of the flash light type, and the small
batteries are of the pen light type.
NOTE: When replacing batteries, make certain that polarities are observed as shown in the schematic diagram. The
instrument may be taken out of its case by removing the two screws on the front panel and the single screw on the rear
of the case.
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