Promax PD-183, Инструкция по эксплуатации

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USER’S MANUAL PD-183
07/2015 Page 13
AC converters of all types are limited by their frequency response
and input dynamic range. Measurements of complex waveforms will
not be affected by converter bandwidth limitations, provide that all
significant AC components contained within the waveforms are
within the bandwidth of the converter.
Crest factor is a measure of the input dynamic range of an AC
converter. It expresses the ability of the converter to accept a signal
that has large peak values compared to its RMS value without
saturating the converter circuitry and degading the specified
accuracy. Crest factor is defined as the ratio of the peak voltage to
the total AC RMS voltage.
V (PEAK)
V (AC RMS)
=
Crest Factor
4.4 Voltage measurements
WARNING :
To avoid possible electric shock, instrument damage
and / or equipment damage, do not attempt to take any
voltage measurements if the voltage is above 1000Vdc
/ 750Vac. 1000Vdc and 750Vac are the maximum
voltages that this instrument is designed to measure.
The "COM" terminal potential should not exceed 500V
measured to ground.
1. Insert the black and red test leads into the COM and V-
Ω
input
terminals respectively.
2. Select the Vac (V~) or Vdc (V
) function and the desired range
by means of the rotary selector.
3. Connect the test lead tips in parallel with the circuit to be
measured (e.g. across a load or power supply). Be careful not to
touch any energized conductors. Note the reading. When appears
the overange indication, selects a higher range.