BEHA-AMPROBE BM155 Расширенная инструкция онлайн [6/20] 529189

●For non-invasive ACA current measurements, press the jaw trigger and clamp the

jaws around only one single conductor of a circuit for load current measurement.

Make sure the jaws are completely closed, or else it will introduce measurement

errors. Enclosing more than one conductor of a circuit will result in differential current

measurement (like identifying leakage current). Locate the conductor(s) at the Jaws

center as much as possible to get the best measuring accuracy. For removal, press

the jaw trigger and remove the jaws from the conductor(s).

●Adjacent current-carrying devices such as transformers, motors and conductor

wires will affect measurement accuracy. Keep the jaws away from them as much as

possible to minimize influence.

THD%-F Total Harmonic Distortion - Fundamental function (Model 155s only)

THD%-F = (Total Harmonics RMS / Fundamental RMS) x 100%

Total Harmonic Distortion - Fundamental (THD%-F) is the percentage ratio of the

Total Harmonics RMS value to the Fundamental RMS value of a voltage or current

signal, and is given by the above expression. An ideal sinusoidal waveform has a

value of 0 THD%. A badly distorted sinusoidal waveform may have a much higher

THD% value of up to several hundreds.

When the meter is in ACV or ACA function, THD%-F values of up to 99 THD% will be

displayed in the secondary mini display automatically. Press THD%-F button

momentarily toggles THD% readings to main display to get full readings of up to

999.9 THD%.