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4-9 Resistance Measurement
WARNING
Before taking any in-circuit resistance measurement, remove
power from the circuit being tested and discharge all Capacitors.
(1) Connect red test lead to “ V
Ω
“terminal and black test lead to
“ COM” terminal.
(2) Set Range Switch to
Ω
range.
(3) Connect Test Lead to the Circuit being measured and read the
resistance Value on LCD.
4-10 Frequency Measurement
(1) Set Range Switch to Hz range.
(2) Connect red test lead to “ V/
Ω
/Hz “ terminal and black test lead to
“ COM” terminal.
(3) Connect Test prods of test leads to the circuit being measured.
(4) Read the frequency value ( Hz ) on LCD.
4-11 TRMS MEASUREMENTS
This model is a True- RMS model. When measuring AC signals,
undistorted sine waves are rarely encountered.
On the contrary, the non- sinusoidal waves, triangle and square
waves, as well as noise affected waves are very common.
With conventional average- sensing meters, the measurement of
such wave forms is impossible because of the great error introduced
by the AC/DC half-wave rectifier.
The measurement signal is converted into the average value and
then multiplied by 1.11, and displayed as rms value of the sine
wave.
