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Basic Inputs &
Measurements:
The Arbiter Systems®
Model 931A Power System Analyzer has 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 combination 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 (for example, 3-phase 4-wire 3-element).
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Voltage:
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Input Range |
1.5 to 750 Volts rms
(underrange to 200 mV) [2 to 1000 Vdc (Model 931A Only)]
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Inputs |
Four; A, B, C, N |
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Phase-to-Phase |
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Phase-to-Neutral |
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Phase-to-Synthesized Neutral (A+B+C
/ 3) |
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Impedance |
1 megohm |
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Leakage |
< 3.5 mA per IEC348 and UL1244
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Current:
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Input Range |
0.04 to 20 Amps rms
(underrange to < 1 mA) |
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Inputs |
Three; A, B, C, plus
synthesized neutral |
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Burden |
0.01 ohm maximum |
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Isolation |
Transformer, 1000 Vrms
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Neutral |
Synthesized, -(A+B+C) |
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Timer:
(Model 931A Only) |
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Inputs |
Two; 4 to 300 Vdc; 20 to 300
Vrms; or dry contact/thyristor output |
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Isolation |
Optical, 300 Vrms, each
channel |
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Transducer: (Model 931A Only) |
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Range |
0 to 1, 0 to 100 mA dc and 0
to 10 Vdc |
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Protection |
Overvoltage to 120 V, both
inputs |
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Isolation |
Optical, 300 Vrms |
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Measurements |
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Voltage and Current:
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Method |
Wideband: True
rms, 3 kHz Bandwidth |
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Narrowband: Fundamental magnitude
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Accuracy |
0.05% of reading |
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Underrange |
< 1% of reading,
typical at 0.3 mA rms |
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DC
voltage |
0.1% of reading +
25 mV dc,
typical (Model
931A only) |
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Phase Angle:
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Input |
Channel 1 to
Channel 2 |
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Range |
0 to 360° or
±180° |
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Accuracy |
0.05° |
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Underrange |
< 1°, typical at
0.3 mA rms |
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Frequency:
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Input |
Channel 1 |
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Range |
20 to 500 Hz
(underrange to 5 Hz) |
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Accuracy |
0.005% of reading
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Harmonics:
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Input |
Channel 1 or
Channel 2 |
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Range |
2nd to 50th
Harmonic (50 or 60 Hz fundamental) |
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Accuracy |
5% of THD reading
+ 0.01% |
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Display
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THD; K-factor;
Amplitude bar graph; and individual harmonic magnitude and phase
(simultaneous) |
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Waveform:
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Display |
Channel 1 and/or
Channel 2 |
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Power / Energy Quantities:
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Range |
0 to 99999 MVA or
MVAh |
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±99999 MVAR or MVARh |
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±99999 MW or MWh |
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±1.0000 PF, lead or lag
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Accuracy |
0.11% of VA, for
VA, VAR, and W, 0.001 PF |
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Transducer Accuracy |
0.05% of reading
+ 0.01% range (Model 931A Only) |
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Timer (Model 931A Only):
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Range |
0.0001 to 9999.9
seconds, or 0.01 to 999999 cycles |
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Accuracy |
0.005% of reading
+ 1 digit |
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AC Trigger |
Add 1 ms maximum,
0.15 ms at 120 Vrms |
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Interface |
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Operator Interface:
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Display |
240x64 graphic
LCD with cold-cathode fluorescent lamp (CCFL) backlight |
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Keyboard |
21 function keys
plus On/Off |
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Memory |
EEPROM (calibration data) |
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Battery backup RAM (setup and stored results) |
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Real-time clock
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Data |
Instrument
calibration data |
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User setups (up to six) |
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Logged data (15 to 200); time-tagged
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System Interface (Model 931A and 930A Only):
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RS-232 |
1200 to 115,200
baud; 7 or 8 data bits; 1 or 2 stop bits; even/odd/no parity |
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Isolation |
Optical, 300 Vrms |
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Power Requirements |
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Internal
Power: |
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Type |
Sealed lead-acid
battery |
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Operation |
8 hours typical
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Charge |
8 hours typical;
fast + float charge |
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External Power:
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Range |
85 to 264 Vac, 47
to 440 Hz, 15 VA maximum |
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110 to 250 Vdc, 15 W maximum
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Safety |
Designed to meet
UL, CSA, VDE |
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General |
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Physical:
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Size |
205mm x 305mm x
225 mm (8" x 12" x 8.75") |
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Weight |
5.8 kg (12.8
lbs), maximum |
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Environmental:
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Temperature |
-10° to +50° C
Operating Temperature |
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-40° to +75° C
Non-operating Temperature |
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Humidity |
Non-condensing
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Options |
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Option Number |
Description |
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930Aopt01 |
16 MB memory |
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931Aopt01 |
16 MB memory |
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