Model 931A Power System Analyzer
Model 931A Power System Analyzer
Full featured Model 931A goes beyond basic and power quantity measurements, supporting two way communications, transducer calibration, timer features and more.
Model 931A Manual
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Model 929A/930A/931A Data Sheet
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Model 929A/930A/931A Data Sheet Espanol
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Model 931A, with state-of-the-art PowerDSA™ 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 incorporate 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 of the basic quantities: true-rms voltage 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 hours (VARh), and power factor (PF), all with 0.11% basic accuracy.
Measure harmonics and view the results graphically on the high contrast 240x64 graphic display. The two channels are normalized to Channel 1 fundamental phase, so you can see, for example, the relationship between current waveform distortions and voltage phase.
Other key 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 (see Key Features tab, below)
- Top-of-the-line Power Measurement and Analysis product
- Measures basic and power quantities
- High accuracy
- Field ready
- Multiple display options including three phase displays
Basic three-phase display - Voltage, current, phase, frequency and power quantities on one convenient display.
Vector display - 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.
- Power Trend Monitor and recording system - verify phase relation, phase rotation, power direction, load balance and more
- Transducer Calibration supported
- CT/PT Ratios
- Extended Measurement Ranges
Input
Input
| Basic Inputs | 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 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). |
Voltage
| Input Range | 1.5 to 750 Vrms (underrange to 200 mV) [2 to 1000 Vdc (Model 931A Only)] |
| Inputs | Four; A, B, C, N |
| Impedance | 1 megohm |
| Leakage | < 3.5 mA per IEC348 and UL1244 |
Current
| Input Range | 0.04 to 20 Arms (underrange to < 1 mA) |
| Inputs | Three; A, B, C, plus synthesized neutral |
| Burden | 0.01 ohm maximum |
| Isolation | Transformer, 1000 Vrms |
| Neutral | Synthesized, -(A+B+C) |
Timer
| Inputs | Two; 4 to 300 Vdc; 20 to 300 Vrms; or dry contact/thyristor output |
| Isolation | Optical, 300 Vrms, each channel |
Transducer
| Range | 0 to 1, 0 to 100 mAdc and 0 to 10 Vdc |
| Protection | Overvoltage to 120 V, both inputs |
| Isolation | Optical, 300 Vrms |
Measurements
Voltage and Current
| Method | Wideband: True rms, 3 kHz Bandwidth |
| Accuracy | 0.05% of reading |
| Underrange | < 1% of reading, typical at 0.3 mArms |
| DC Voltage | 0.1% of reading + 25 mVdc, typical |
Phase Angle
| Input | Channel 1 to Channel 2 |
| A-B Range | 0 to 360° or ±180° |
| A-B Accuracy | 0.05° |
| Underrange | < 1°, typical at 0.3 mArms |
Frequency
| Input | Channel 1 |
| Range | 20 to 500 Hz (underrange to 5 Hz) |
| Accuracy | 0.005% of reading |
Harmonics
| Input | Channel 1 or Channel 2 |
| Range | 2nd to 50th Harmonic (50 or 60 Hz fundamental) |
| Accuracy | 5% of THD reading + 0.01% |
| Display | THD; K-factor; Amplitude bar graph; and individual harmonic magnitude and phase (simultaneous) |
Waveform Display
Channel 1 and/or Channel 2
Power
| Range | 0 to 99999 MVA or MVAh |
| Accuracy | 0.11% of VA, for VA, VAR, and W, 0.001 PF |
Timer
| Range | 0.0001 to 9999.9 seconds, or 0.01 to 999999 cycles |
| Accuracy | 0.005% of reading + 1 digit |
| AC Trigger | Add 1 ms maximum, 0.15 ms at 120 Vrms |
Transducer Accuracy
0.05% of reading + 0.01% range
Interface
Operator
| Display | 240x64 graphic LCD with cold-cathode fluorescent lamp (CCFL) backlight |
| Keypad | 21 function keys plus On/Off |
| Memory | EEPROM (calibration data) |
| Data | Instrument calibration data |
Power Requirements
Internal Battery
| Type | Sealed lead-acid |
| Operation | 8 hours typical |
| Charging Time | 8 hours typical; fast + float charge |
External
| Range | 85 to 264 Vac, 47 to 440 Hz, 15 VA maximum |
| Safety | Designed to meet UL, CSA, VDE |
General
Physical
| Instrument/Size | 205 x 305 x 225 mm (8 x 12 x 8.75 in.) |
| Weight | 5.8 kg (12.8 lbs), net |
Environmental
| Temperature | Operating: 0 °C to +50 °C |
| Humidity | Noncondensing |
| General | |
|---|---|
| 931Aopt01 | 16 MB memory |
| Included | |
|---|---|
| 812H | Safety Ground Lead |
| CA0019806 | RS-232 Null Modem Cable, DB9F-DB9F, 2 m (6 ft) length |
| PD0017400 | Operation Manual (931A) |
| P01-P10 | Country specific power cord with straight female end Country specific plug and power cord cable with straight female end.
|
| Available | |
| 09311A | 400 Amp 20:1 Precision CT, 0.1% Accuracy Extends the outstanding accuracy, features, and performance of Models 931A, 930A and 929A by increasing the current input capability to 400 amperes. Available on Models 931A, 930A, and 929A.
|
| 811AT | 3-Phase Univ. Test Plug Current Lead Set |
| 813AT | 3-Phase Safety Voltage Lead Set |
| 816AT | 3-Phase Spade-Lug Current Lead Set |
| 817AT | CT Lead Set Used in conjunction with the AP0001300, AP0006700, AP0010200, AP0010300, AP0012300, AP0012800, or a customer supplied CT.
|
| 818AT | Safety C-Hook Current Lead Set |
| AP0001300 | 1000:1 Clamp-on CT, 1000 A (Current Output) |
| AP0006700 | CT, Clamp-On, 3000 Amp, 660V, Elliptical Opening (Current Output) |
| AP0010200 | CT, Clamp-On, 1000 Amp, 1000:5,Elliptical Opening (Current Output) |
| AP0010300 | CT, Clamp-On, 600 Amp, 100:1 (Current Output) |
| AP0012900 | AC Current Probe, Clamp-On, 1000A, Selectable Ranges; 250:5, |
| AS0035901 | Adjustable Tilt Handle/Bail Assembly |
| AS0036000 | 400 Amp CT Bracket (each) |
| AS0060000 1 | PowerCSV Application Software for Models 931A and 930A PowerCSV software allows a computer, via the serial port, to import, export and view data from the extended memory of the Models 931A and 930A.
|
| AS0079001 | Universal Test Plug Current Shunt, A Phase Red |
| AS0079002 | Universal Test Plug Current Shunt, B Phase Yellow |
| AS0079003 | Universal Test Plug Current Shunt, C Phase Blue |
1 Available via download only
App Note 110: Measuring Low-Level Signals w/Model 931A
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App Note 113: Using Clamp-On Current Transfomers (CTs) with Arbiter Power Analyzers
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Logging Files from the Model 931A Power System Analyzer
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Model 09311A 400 Amp Auxiliary Current Transformer
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Model 09311A 400 Amp Auxiliary Current Transformer Espanol
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Overview Presentation of Model 931A Power System Analyzer
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