Model 931A with
Digital Signal Analysis, make
more measurements, more
accurately, and at a lower price
than ever before. Basic accuracy
of 0.05% of reading and 0.05°
phase, harmonic analysis, and
full three-phase capability are
standard. Model 931A also
incorporates full two way serial
communication for use in power
quality trend monitoring. The
model expands usability by
including transducer calibration
and timer features.
Model 931A, featuring PowerDSA™
Digital Signal Analysis,
measures all the basic
and current, frequency and phase
angle, as well as power
quantities such as watts (W),
watthours (Wh), volt-amperes
(VA), volt-ampere hours (VAh),
volt-amperes reactive (VAR),
volt-amperes reactive (VARh),
and power factor (PF), all with
0.11% basic accuracy
harmonics and view the results
graphically on the high contrast 240 x
64 graphic display. The two channels are
normalized to Channel 1 fundamental
phase, so you can see, for example, the
relationship between current waveform
distortion and voltage phase.
functions include a timer / counter for
measuring relay operating times, elapsed
test times, or for counting input rates
and events, The 931A
include a full three-phase input
section, for automated three-phase
measurement sequences, complete with
multiple display modes:
View voltages, currents and phase angles
with their vector representation.
Voltage /Current Sequence Display
― view voltage,
current and phase along with positive,
negative and zero sequence values.
Energy Display ― view voltage,
current, phase, frequency and energy
quantities on one convenient display.
Trend Monitor and Recording System
― verify phase
relation, phase rotation, power
direction, load balance.
• Transducer Calibration
• CT / PT Ratios.
• Extended Measurement Ranges.
Supports two main measurement channels.
Channel 1 and channel 2. Any voltage or
current input signal may be selected for
either channel. For basic measurements
(voltage, current, frequency, phase
angle) any combinations of inputs may be
used. For power and energy measurements
(active power, apparent power, reactive
power and power factor), one voltage and
one current must be selected. For
three-phase measurements, the input
configuration is selected automatically,
based on the measurement type (foe
example, 3-phase 4-wire 3-element).