Model 928A Power System Multimeter

Handheld, affordable Power System Multimeter measures power and energy, flicker, harmonics, phase angle, and displays waveforms.

Model 928A Manual
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Model 928A Data Sheet
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Model 928A Data Sheet Español
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Model 928A Calibration Report vs Certificate of Compliance
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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.

The Starter Kit, now standard, complements the Model 928A, making it a complete measurement system.

For current measurements, the Model 928A works with several Arbiter external Current Transformers available as accessories to the unit.

Calibration Report (standard)

The Model 928A is provided with a Calibration Report. The Calibration Report lists the calibration constants and measurements and includes a statement of calibration practices. More details »

Certificate of Compliance and Traceability (available)

A Certificate of Compliance and Traceability is available for purchase for a nominal fee. The CofC is a dated and signed document certifying the purchased equipment meets or exceeds it's specifications with accuracy traceable to NIST. Also provided with the certificate: a dated verification report, a dated calibration report, and the calibration dates (cal and due) are entered into each unit. More details »

Review the Model 928A Calibration Report vs Certificate of Compliance for a detailed description of differences.

NOTE: The Model 928A Power System Multimeters shipped after 2015 feature a redesigned current input. Read the Press Release for additional information.

Accéder au résumé en français

Key Features
Specs
Options
Accessories
Software
Firmware
Related Resources

Downloadable CT characterization files.
Low Cost
0.1 % Accuracy
Power and Energy
Flicker per IEC 61000-4-15
Harmonics I, V to 50th, THD
Phase Angle I-I, V-V, I-V
Waveform Display

Standard Starter Kit:

Starter Kit provides the following:

AP0009700 Voltage Probe Lead Set (Clarification: two AP0009700's ship when ordering the Starter Kit)
AP0011200 External power supply, + 7 Vdc
AP0012300 100:1 Clamp-on CT, 150 A, 10 mV/A (1 V @ 100 A ac)
AS0082900 928A Bail Assembly
BT0000201 Four (4) AA Alkaline cells
CA0026106 USB Data Cable, 6 ft
CA0027200 CT Cable, Voltage Output
CTCAL01 CT characterization, 100 mA to 100 A (other ranges are available for additional fee. Contact sales for more information)
HD0069800 928A Soft Carrying Case

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	2^nd to 50^th 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 229 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

General
928AoptCTCHAR	CT Characterization

Included
AP0009700	Voltage Probe Lead Set
AS0071800	Model 928A Starter Kit
AS0093800	Operation Manual (928)
Calibration Report (928A)	Calibration Report - Statement of Calibration Practices
Available
AP0001300 ¹	1000:1 Clamp-on CT, 1000 A (Current Output)
AP0011200	Wall-mount Power Supply: 100-240 Vac, 50-60 Hz; 7 Vdc, 0.714 A
AP0012300 ²	100:1 Clamp-on CT, 150 A, 10 mV/A (1 V @ 100 A ac)
AP0012800 ¹	1000:1 Clamp-on CT, 200 A, 1 mA/A (100 mA @ 100 A ac)
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
AS0082900	928A Bail Assembly
AS0104000	928A CT Cable Compression Ring and Install Tool
BT0000201	4-AA Alkaline cells
CA0026106	USB Data Cable, 6 ft
CA0027100	CT Cable, Current Output, 6 ft
CA0027200	CT Cable, Voltage Output, 6 ft
CN0030500	Adaptor Banana Shielded - Red
CN0030501	Adaptor Banana Shielded - Black
CofC (928A) ³	Certificate of Calibration and Traceability
HD0069800	Soft Carrying Case (928)
MLINK	Mlink software

¹ Requires CA0027100
² Requires CA0027200
³ Fee is more when purchased after delivery of 928A.

Click to Download Latest Version of Software
928_Mlink_04Jan2011_0508	Simplifies the modification of various configuration settings
928_Mlink_SHA256_04Jan2011_0508	928A_Mlink SHA256 checksum
928_UserCTProg_12Jul2007_010	Allows for CT File Creation and Modification
928_UserCTProg_SHA256_12Jul2007_010	928_UserCTProg SHA256 checksum

Software Version and Related Information

928_Mlink

This software interface has been specifically written for the Model 928A.

Supports transfer of data from the 928A to your PC.
Simplifies configuring complicated measurement functions like Power Quality.
Allows upload of latest firmware release to the 928A.
Compatible with Windows 7 and 10.

Version	Rev Level	Version Notes
04Jan2011	0.508	Fixed incorrect date when importing/exporting with spreadsheets.
21Jul2010	0.507	Initial release

928_Mlink_SHA256

Version	Rev Level	Version Notes
04Jan2011	05.08

928_UserCTProg

Utility allows the creation and modification of CT characterization files for Model 928A.

Version	Rev Level	Version Notes
12Jul2007	0.1.0	Initial Release

928_UserCTProg_SHA256

Version	Rev Level	Version Notes
12Jul2007	0.1.0

Firmware Information (EPROM based firmware is not available for download)
928_Firmware_11Oct2016_113	Downloadable. Requires 928_MLink version 0.506 or newer.
928_Firmware_SHA256_11Oct2016_0113	928_Firmware SHA256 checksum

Firmware Version and Related Information

Downloadable firmware (928_Firmware)

Version	Rev Level	Version Notes
11Oct2016	1.13	Host Version 1.13 11Oct2016 Updated to meet requirements of compiler. DSP Version 1.05 11Oct2016 Correct the increased phase shift in the 50 Hz due to new current board configuration. **Use this firmware only if the unit has metal-current input connectors.**
23Feb2011	1.12	Host Version 1.12 23Feb2011 Fix date on firmware version screen. Minor testing enhancement (BZ638). DSP Version 1.04 24Feb2010 No Changes.
24Feb2010	1.10	Host Version 1.10 24Feb2010 Limit Flicker values to two decimal digits of resolution (match 933 and 1133). Fix potential log data download data corruption problem. Overflow in certain values of Power Quality Config. (BZ 511) Set default date to 1 Jan 2010, was 6 Jan 2005 (only used when powered for the first time). DSP Version 1.04 24Feb2010 Harmonic Phase Angles fixed. (BZ 535)
08Jan2007	1.05	Host Version 1.05 08Jan2007 Add factory calibration storage element. Key repeat feature now limited to only the "Up" and "Down" arrow keys. Also implemented a maximum repeat time (get rid of stuck key keeping the unit powered). Add units to Thd, RMS-K, Thd-F and Thd-T readings (F1 user screen). Update to use new "ISR()" macro ("SIGNAL()" macro being deprecated) DSP Version 1.02 08Jan2007 Updated to support 928 internal CT wiring differences
03Aug2006	1.03	Update menu screens which did not wrap when scrolling through options. F1 user screen basic data changed to use "normal" non-changing basic data (not effected by hold-min-max-avg). Fix display of calibration date info (if no calibrations date and Flash modified, it would incorrectly increment to the calibration menu).

928_Firmware_SHA256

Version	Rev Level	Version Notes
11Oct2016	01.13

Using SensorLink Litewires with the Model 928A
Download Using_SensorLink_Litewires_with_928A.pdf (277 kB) »

Model 928A Current Input Connector Upgrade
Download PD0054400_928a_connector_press_release.pdf (328 kB) »

Model 928A CT Compression Ring Installation
Download PD0054000_928a_comp_ring_install.pdf (646 kB) »