Decibel Measurement; Battery And Fuse Replacement - Gardner Bender GMT-18A Manual Del Propietário

8.0 Decibel Measurement

The decibel feature of this multimeter is for transistor gain
measurement in electronic circuits and should not be
confused with audio decibels. This function is used
primarily by electronics technicians to measure the power
gain in transistors, and is rarely encountered in home
project applications.
1) Fully seat the test leads in the correct input jacks.
2) Set the function/range switch to any one of the AC voltage
ranges and read the decibel measurement on the bottom
(red) scale of the faceplate. Based on the AC voltage
range you selected, you will need to compute the actual
measurement by using the decibel conversion chart
located at the bottom right of the faceplate.
Important: For absolute decibel measurements, circuit
impedance must be at least 600 ohms. -0- decibels = 1
milliwatt in a 600 ohm impedance (equivalent to 0.775 volts
across 600 ohms).

9.0 Battery and Fuse Replacement

1) Remove the screw in the back cover of the tester and
carefully separate the back cover from the front.
2) Note the polarity of the batteries when removing them
from their compartments and replace.
3) Use GB catalog number GF-0306 0.5A/250V
replacement fuses.
4) Carefully replace the back cover and tighten the screw.
Do not overtighten the screw as this may strip the threads
in the tester housing.
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