Arbiter Systems 931A, Руководство по эксплуатации

Страница: 32 / 161

3.3.1.1 Volts/Amps
Setup 1
VOLTS
AMPS
ESCAPE
Press the VOLTS/AMPS key to display the amplitude values for
the signals routed to Channels 1 and 2. The input multiplexing
circuitry determines which input signals are connected to the
measurement channels, according to selections made by the
operator (see Sections 3.5.1.2 and 3.5.2.2).
Press the VOLTS/AMPS key again to produce a tabular display
showing the signals routed to Channels 1 and 2. Also present is a graphical
display of the phase angle. Tabular values, including phase, Watts, VARs,
VA, Lead or Lag and frequency (Hz) are located on the right side of the
display.
Make amplitude measurements with the instrument in either the
narrow-band mode (fundamental only), or wide-band mode (true rms).
In wide-band mode, the square root of the average of the squared
instantaneous sampled values determines the true rms amplitude. It
includes harmonics up to 3.05 kHz and removes DC prior to calculation.
In narrow-band mode, an extremely accurate, proprietary digital signal
processing (DSP) algorithm determines the fundamental amplitude. It also
excludes the effects of DC, harmonics and noise.
3.3.1.2 Phase/Frequency
Setup 2
PHASE
FREQUENCY
Press the PHASE/FREQUENCY key to display the frequency
of the input signal routed to measurement Channel 1, and the
phase angle of the signal routed to Channel 2 (relative to the
signal on measurement Channel 1).
The input multiplexing
circuitry determines which input signals are connected to the
measurement channels, according to selections made by the
operator (see Sections 3.5.1.2 and 3.5.2.2).
Phase angle and frequency are always measured using narrow-band
fundamental DSP techniques, guaranteeing accurate measurements in the
presence of harmonics, noise, and DC offsets. The displayed phase angle
is that of the fundamental component only.
16