2
Meter:
The
meter is scaled from 0 to 100. On the 100-mA range, readout is
direct (100 = 100 mA). On the 1-A range, move the decimal point 2 places to
the left (100 = 1.00 A). To convert meter readings made on the 30 mA, 300
mA, and 3-A ranges, multiply accordingly. For example, a reading of 85 on the
300-mA range equals 300 x .85, or 255 mA. The chart below will help you
estimate readings quickly:
Range
Meter
300 mA
1 A
3 A
10 30
0.1 0.3
20 60
0.2 0.6
30 90
0.3 0.9
40 120
0.4 1.2
50 150
0.5 1.5
60 180
0.6 1.8
70 210
0.7 2.1
80 240
0.8 2.4
90 270
0.9 2.7
100 300 1.0 3.0
The <30 mA range is uncalibrated and meter readings represent a relative
indication only. It is normal, at high sensitivity, to see some residual meter
reading (up to 15%).
Range:
The
Range
switch selects between three calibrated scales (from 300
mA to 3 Amps). To prevent meter pegging, begin checks on a high range and
work down. To estimate unknown current levels, use the formula below (I =
Unknown Current in Amps, P = Applied Power in Watts, and R = Load
Resistance in Ohms).
I
P
R
=
RF Hazard--Important Warnings:
1. RF-current measurements must be conducted with extreme caution. Physical
contact with conductors carrying even moderate RF-energy levels can result
in severe RF burns, or injury.
2. Avoid measuring RF current on conductors where high RF voltages may be
present (>500 Volts). Damage to your meter may result.