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 NoteThe 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 Range1 Vrms to 660 Vrms
Impedance1.2 megohm, differential

Current

Input Range0.01 Arms to 1.2 Arms or 0.01 Vrms to 1.2 Vrms
Low Rangeto < 1 mA or 1 mV
Burden0.01 ohm maximum (current input style) or 100 kohms nominal (voltage input style)

Measurements

Voltage and Current

MethodWideband: True rms, 3 kHz Bandwidth
Narrowband: Fundamental magnitude
Accuracy0.1 % 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 Range0 ° to 360 ° or ± 180 °
A-B Accuracy0.1 °
Underrange< 1 ° typical

Frequency

Range50 Hz or 60 Hz ± 5 Hz
Accuracy0.005 % of reading

Harmonics

InputChannel A and Channel B, simultaneous
Range2nd to 50th Harmonic (50 Hz or 60 Hz fundamental)
Accuracy0.1 % THD + 5 % reading
DisplayTHD; K-factor; Amplitude bar graph; and individual harmonic magnitude and phase (simultaneous)

Waveform Display

Channel A and/or Channel B

Power

Range0 MVA or MVAh to 99999 MVA or MVAh
± 99999 MVAR or MVARh
± 99999 MW or MWh
± 1.0000 PF, lead or lag
Accuracy0.1 % of VA, for VA, VAR, and W
0.001 PF

Interface

Operator

Display128 pixel x 64 pixel graphic LCD
Keypad30 key keypad
SerialUSB
Memory512 KB flash
DataUser setups, Real Time Clock, Approximately 400 KB measurement data

Power Requirements

Internal Battery

Type4-AA Cells, alkaline or NiMH (not included)
Operation30 hours typical with alkaline cells. 60 hours typical with NiMH

External

Voltage+ 7 Vdc, unregulated (not included)
Current< 100 mA
Connector5.5 mm x 2.0 mm, center positive

General

Physical

Instrument/Size200.0 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
Weight1 kg (2.2 lbs), net
2.5 kg (5.5 lbs), shipping

Environmental

TemperatureOperating: 0 °C to + 50 °C
Nonoperating: – 40 °C to + 75 °C
HumidityNoncondensing
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