Decibel Measurement - Minipa ET-2022B Manual De Instrucciones

(BLACK) scale. Make this procedure always that select a new
resistance range.
4. Turn off the power of the circuit under test and discharge all
capacitors before connecting the test leads to the points to be
measured.
5. Touch the test leads to the points to be measured or tested. The
value will be shown in Ω (BLACK) scale.
E. Decibel Measurement
1. Connect the red test lead to + terminal and the black test lead to
-COM terminal.
2. Select the rotary switch to one ACV range. Remember that the
reading will be more accurate is it is taken in the upper half of the
scale.
3. The reading is taken in dB (RED) scale. Remember that the
reading is direct only when the 10V AC range is used. For others
ranges, 50V, 250V and 1000V AC, add respectively 14dB, 28dB
and 40 dB, to the value read from dB (RED) scale.
NOTE:
For measurement of an absolute value in dB, the circuit imped-
ance must be 600Ω. In this impedance value, 0dB is equivalent
to 1mW dissipated over this impedance (equivalent to 0.775 Volts
over 600Ω).
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