Model 928A Power System Multimeter
The Model 928A Power System Multimeter with Floating-Point DSP™ Digital Signal Analysis is an AC Power measurement instrument, providing outstanding performance and flexibility in a small, hand-held package. Not only does the Model 928A measure basic data and power quantities, but it also measures power quality including harmonics, flicker, sags, surges and interruptions. Incorporating a graphic LCD display, serial communications, real time clock and an unprecedented combination of features makes the Model 928A the ideal instrument for the power professional.
For current measurements, Model 928A works with several Arbiter external Current Transformers available as accessories to the unit.
Produktinformation
Produkt Specifikation
Input
| Configuration Note | The Arbiter Systems®, Inc. Model 928A Power System Multimeter™ has two identical measurement channels, Channel A and Channel B. Each input channel has a voltage input and a current input. Current inputs are intended for use with external CTs having a nominal output of 0 Arms to 1 Arms or 0 Vrms to 1 Vrms. For basic measurements (voltage, current, frequency, and 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. |
Voltage
| Input Range | 1 Vrms to 660 Vrms |
| Impedance | 1.2 megohm, differential |
Current
| Input Range | 0.01 Arms to 1.2 Arms or 0.01 Vrms to 1.2 Vrms |
| Low Range | to < 1 mA or 1 mV |
| Burden | 0.01 ohm maximum (current input style) or 100 kohms nominal (voltage input style) |
Measurements
Voltage and Current
| Method | Wideband: True rms, 3 kHz Bandwidth Narrowband: Fundamental magnitude |
| Accuracy | 0.1 % of reading or ± 5 mV, whichever is greater (voltage) 0.1 % of reading + CT errors (current) 1 % of reading + CT errors (low current range) |
Phase Angle
| A-B Range | 0 ° to 360 ° or ± 180 ° |
| A-B Accuracy | 0.1 ° |
| Underrange | < 1 ° typical |
Frequency
| Range | 50 Hz or 60 Hz ± 5 Hz |
| Accuracy | 0.005 % of reading |
Harmonics
| Input | Channel A and Channel B, simultaneous |
| Range | 2nd to 50th Harmonic (50 Hz or 60 Hz fundamental) |
| Accuracy | 0.1 % THD + 5 % reading |
| Display | THD; K-factor; Amplitude bar graph; and individual harmonic magnitude and phase (simultaneous) |
Waveform Display
Channel A and/or Channel B
Power
| Range | 0 MVA or MVAh to 99999 MVA or MVAh ± 99999 MVAR or MVARh ± 99999 MW or MWh ± 1.0000 PF, lead or lag |
| Accuracy | 0.1 % of VA, for VA, VAR, and W 0.001 PF |
Interface
Operator
| Display | 128 pixel x 64 pixel graphic LCD |
| Keypad | 30 key keypad |
| Serial | USB |
| Memory | 512 KB flash |
| Data | User setups, Real Time Clock, Approximately 400 KB measurement data |
Power Requirements
Internal Battery
| Type | 4-AA Cells, alkaline or NiMH (not included) |
| Operation | 30 hours typical with alkaline cells. 60 hours typical with NiMH |
External
| Voltage | + 7 Vdc, unregulated (not included) |
| Current | < 100 mA |
| Connector | 5.5 mm x 2.0 mm, center positive |
General
Physical
| Instrument/Size | 200.0 mm x 104.2 mm x 37.4 mm (7.9 in x 4.1 in x 1.5 in) 381 mm x 305 mm x 299 mm (15 in x 12 in x 9 in), shipping |
| Weight | 1 kg (2.2 lbs), net 2.5 kg (5.5 lbs), shipping |
Environmental
| Temperature | Operating: 0 °C to + 50 °C Nonoperating: – 40 °C to + 75 °C |
| Humidity | Noncondensing |
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