Page 1 MODEL 928A USER’S MANUAL Arbiter Systems, Inc. Paso Robles, CA 93446 U.S.A.
Page 2 This manual is issued for reference only, at the con- venience of Arbiter Systems. Reasonable eﬀort was made to verify that all contents were accurate as of the time of publication. Check with Arbiter Systems at the address below for any revisions made since the original date of publication.
Page 3 The responsibility of Arbiter Systems under this warranty is limited to repair or replacement, at Arbiter Systems’ option, of any product found to be defective. Arbiter Systems shall have no liability un- der this warranty unless it receives written notice of any claimed defect, within the earlier of: ˆ...
Page 4 Arbiter Systems (whether by the substitu- tion of non-approved parts or otherwise). The remedies provided herein are Buyer’s sole and ex- clusive remedies. In no event shall Arbiter Systems be liable for direct, indirect, incidental or consequential damages (including loss of proﬁts), whether based on contract, tort, or other legal theory.
Page 5 Arbiter Systems, Inc. Model 928A — Power System Multimeter User’s Manual Warranty Table of Contents Introduction Getting Started Operation Mlink Software Tutorial Functional Description Speciﬁcations Appendixes Index Copyright Arbiter Systems Incorporated January 2012 All rights reserved. International copyright secured. PD0030900J...
Page 7: Table Of Contents
Caution: Direct Current Input ..Measuring Safety and Usage ..928A Starter Kit ... . . Getting Started Keyboard Operation ....
Page 8 Basic Functions and Keys ... 13 MIN/MAX – Range ... 13 LCD – Display Control ..13 Function Keys, f1 –...
Page 9 Installing Mlink ....68 Connecting to the 928A ... . 68 Startup - USB Connection ..68 Mlink Main Window .
Page 10 Uploading New Firmware ... 82 Functional Description Introduction ....83 User Interface ....83 Details .
Page 11 Secondary Keys ....95 CT Input Connector 928A Current Input Connector ..97 CT Cable Connector ....98 Phase Conventions CE Mark Certiﬁcation...
Page 13 Power Quality Point Limits ..79 Upload Firmware Window ..82 928A Current Connector Layout ..97 CT Cable Connector – side view ..98 CT Connector End View .
Page 15: Introduction
Introduction Scope Welcome to Arbiter Systems’ Power System Multi- meter with Floating Point DSP — ! The Model 928A Power System Multimeter is ﬁlled with great features to help you measure electrical power. Whether you are a new or experienced user, you should ﬁnd the Model 928A easy to use and accurate.
Page 16: Simple Measurement
Recording Data Store data by pressing the STO button or using one of the Auto-Log features. The 928A also stores Sags and Swells, and standard Triggers in ﬂash memory. 400 kB of ﬂash memory provides enough space to store thousands of records.
Page 17: Caution: Direct Current Input
Be sure to follow all precautions and safety information provided with any other equipment you are using. Display Using a 128x64 pixel display, the 928A can display all text and graphics necessary for operation. The LCD can be adjusted for contrast and backlighted opera- tion.
Page 18: 928A Starter Kit
CT Characterization While the 928A Starter kit includes a CT probe that has been characterized for accuracy, Arbiter also pro- vides a service for users to have their own CT charac- terized for use with the 928A.
Page 19: Getting Started
Getting Started Keyboard Operation Most of the keys on your 928A perform one primary and one secondary function. The primary function of any key is indicated by the characters on the face of the key; for example, ON. The secondary functions are indicated above the key;...
Page 20: Power Supply, On And Oﬀ
ENT. Alternatively, press STO. Power Supply, On and Oﬀ Press ON to power the 928A ON and OFF. To con- serve power, the multimeter can be conﬁgured to au- tomatically turn itself oﬀ after an adjustable period of inactivity.
Page 21: Battery Compartment
Battery Replacement 1. Power oﬀ the 928A prior to removing the batter- ies. 2. Remove the battery cover retaining screw and remove the cover by pulling it upwards at the screw side. See Figure 1. 3. Replace the batteries. Note that battery orien- tation is indicated by polarity symbols.
Page 22: Ac Power Adapter
AC Power Adapter Included in the Model 928A Starter Kit is a power adapter (Arbiter part no. AP0011200) that provides power to the 928A and is suitable for continuous use. The power adapter is not designed to charge batter- ies located in the battery compartment. For power adapter details and speciﬁcations, see “AC Power...
Page 23: Bail Assembly Attached To Lower Holes
Figure 2: Bail Assembly attached to lower holes Figure 3: Bail Assembly attached to upper holes...
Page 24: Measurement Terminals
Measurement Terminals The Model 928A has two identical sets of measurement terminals, called Channel A and Channel B, that ac- cept either a voltage or a current. To measure a cur- rent, select one of the current input connectors at the top of the instrument.
Page 25: Voltage Terminals
Voltage Terminals Two sets of voltage terminals allow you to apply volt- ages up to 660 Vrms, max. They may also be scaled for reading the primary voltage on a PT or transformer. These inputs are labeled “CHANNEL A” and “CHAN- NEL B.”...
Page 26: Current Terminals
The Current Input terminals for Channels A and B allow you to connect either a voltage-output CT or current-output CT to the 928A. A CT conﬁguration screen allows you to setup CT val- ues for both channels ahead of time.
Page 27: Basic Functions And Keys
Caution: Maximum CT Input Level: Never apply any signal to Channel A or B current input terminals which is greater than 1.2 Arms or 1.2 Vrms. Basic Functions and Keys MIN/MAX – Range Press the MIN/MAX key to cycle through various measurements, including the minimum, maximum, av- erage and normal (active).
Page 28: Function Keys, F1 - F6
. . ,f6 There are currently no functions assigned to the secondary keys labeled f2 through f6. Splash Screen When ﬁrst powered on, the 928A will display an intro- ductory message that describes the 928A. Press any of the main measurement keys (e.g. VI) to bypass the splash screen.
Page 29: Menu - Conﬁguration And Settings
MENU – Conﬁguration and Settings Use the MENU key to set up the functions, preferences and operating parameters of the 928A. Access these menus through the Main Menu, or in context. Main Menu 1. Press 2nd MENU MENU to open the main menu.
Page 30 Phase Preference 1. From the Main Menu, highlight “Phase Prefer- ence” with the cursor and press ENT to open the Phase Preference menu. 2. REFERENCE: Press ENT and to set the Reference to Channel A or B. Press ENT to set 3.
Page 31 Frequency Preference 1. From the Main Menu, highlight “Frequency Preference” and press ENT to open. 2. REFERENCE: Press ENT and to access and change Reference value to A or B and ENT. 3. SETTING: Press ENT and to access and change Frequency SETTING to either 50 Hz or 60 Hz, and ENT to set it.
Page 32: Menus In Context
Flash Utilities Menu Use the Flash Utilities Menu to manage 928A mem- ory. Choose either “Stop-Full” or “Overwrite” in Full Mode to control storage with full memory condition. Choose “Yes” or “No” in Erase Flash? to do so. Calibration Date Info If your unit has a calibration certiﬁcate, highlight this...
Page 33: Esc - Escape, Go Back
STOre And Exit and pressing ENT. When Recording Data The Model 928A stores records according to the date and time running in the internal clock. Before mea- suring, check the clock for the correct time in the case that it has drifted or was inadvertently changed. See TIME and DATE, on pages 20 and 21, for more infor- mation on setting the time and date.
Page 34: Time - View Or Set Time
TIME – View or Set Time Viewing the Time Press 2nd TIME to view the time. Adjusting the Time 1. While viewing the time, press 2nd MENU to access the time adjust screen. 2. Press to move between ﬁelds and ENT to enter the Time value ﬁeld you want to change.
Page 35: Date - View Or Set Date
DATE – View or Set Date Viewing the Date Press 2nd DATE to view the date. Adjusting the Date 1. While viewing the date, press 2nd MENU to access the date adjust screen. 2. Press or to move between ﬁelds and highlight the value you want to change.
Page 36: Using The Input Channels
3. Choose the Measurement Mode: For exam- ple, press to display voltage and/or current values. 4. Connect the Equipment: To measure, con- nect the leads between the 928A and the circuit under test.
Page 37: Conﬁguring Channels A And B
Conﬁguring Channels A and B Conﬁgure Channels A and B, for both current and voltage through this menu. Four possibilities exist: Ch-A V Channel A measuring a voltage Ch-A I Channel A measuring a current Ch-B V Channel B measuring a voltage Ch-B I Channel B measuring a current You can completely conﬁgure all these possibilities...
Page 38 4. The display should change to the “Ch A VOLT- AGE CONFIG” screen. The conﬁgured items for voltage are Input Ratio and Phase Oﬀset. 5. Press to select desired ﬁeld and ENT to select value to change. Input Ratio 6. Enter the ratio values from the numeric keypad and press ENT to move to the next ﬁeld.
Page 39 CT, provided by Arbiter Systems. Calibration constants are obtained from Arbiter Systems and installed in the 928A using Mlink software. See “CT Pro- ﬁles” in the Mlink Software Tutorial, on page 72 for information on uploading CT proﬁles.
Page 40 Low Range Mode For current measurements below 10 mA rms (i.e. into the 928A itself, not the CT) it may be advisable to switch the Low Range Mode ON. The Low Range Mode, multiplies the input signal by a factor of 20, and can improve accuracy and stability of the signal.
Page 41 AC Input: 75 Arms, maximum AC Output: 10 mV/A rms 660 Vrms Working volts, max. This probe produces 10 mV at the output terminals (to the 928A) for an input current of 1 Amp. MAXIMUM OUTPUT VOLTAGE = AC Input AC Output Ratio...
Page 42 If measuring current, use the current terminals. Measuring Voltage and Current Most of the measured values available from the 928A are derived from the voltage, current and frequency measurements. Most of the advance functions using these basic measurements are found in the next section entitled “Operation.”...
Page 43: Using The Mn352 Current Probe
Connect the CA0027200 accessory voltage-output CT cable between Channel A or B current input connector on the Model 928A and the safety sockets on MN352. Observe the polarity markings for correct reading. Warning: Always remove the clamp from the circuit under test before connecting/disconnecting the acces- sory cable at either end.
Page 44: Ct Characterization Files
ﬁle (or “Proﬁle”) that improves the ac- curacy for current measurements. Before using the probe, the proﬁle must be uploaded to the Model 928A using Mlink software and conﬁgured in the Model 928A. The Model 928A stores up to ﬁve CT proﬁles.
Page 45: Operation
Introduction Information in this section provides speciﬁc details on conﬁguring and using more advanced functions of the 928A. Certain fundamental procedures are covered in the previous chapter, such as “Conﬁguring Channels A and B” starting on page 23. If you have not previ- ously reviewed them, it would be good to do so at this time.
Page 46: Making Measurements
1. Verify that Channel A and Channel B are con- ﬁgured properly. If necessary, refer to Getting Started page 23, Conﬁguring Channels A and B. 2. Press VI and connect the probe(s) between the 928A and the circuit elements. 3. Read values on the display.
Page 47 Display Deﬁnitions Display Description Channel A with units in volts. 60.000 Hz measured line frequency 123.45 measured channel A signal in volts 1.2345 measured channel B signal in amps Channel B with units in amps. -8.59 Phase angle of channel B signal relative, in degrees, to channel A.
Page 48: F - Phase And Frequency
F – Phase and Frequency To measure phase, you will need to connect two signals to the Model 928A: current-current, voltage-current or voltage-voltage. Frequency requires only one input. Setup 1. Verify that Channel A and B are conﬁgured properly for the type of signals that you are mea- suring.
Page 49 Note that the 928A is very ﬂexible and always com- pares the signals at channels A and B for their phase relationship, regardless of the type of signal, whether voltage or current. Phase Conventions The following chart illustrates the standard phase con- ventions as used in the Model 928A.
Page 50: Pwr - Active And Reactive Power
PWR – Active and Reactive Power To use the power measurement function on the 928A, you must select one measurement channel for voltage and the other for current. In this example, Channel A is conﬁgured as voltage and Channel B as current.
Page 51 Display Deﬁnitions The display should indicate Active and Reactive power, showing the eﬀective power to a load and wasted power returned to the line. The displayed units are Watts on the top and Vars on the bottom. Determining Active Power Active power is calculated from the real components of the current and the voltage.
Page 52: Pf - Power Factor Apparent Power
Apparent Power To use the Power Factor and Apparent Power func- tion on the 928A, you will need to select one of the measurement channels for voltage and the other for current. In this example, Channel A is selected as voltage and Channel B as current.
Page 53 Display Deﬁnitions The power factor displayed is determined from the reactive component of power. Lead Lag Display If you wish to know if the power factor is leading or lagging, conﬁgure this through the main menu, under Phase Preference. See page 16, under Phase Prefer- ence.
Page 54: Wh - Watt-Hour
Use this mode to view the energy received and deliv- ered. To view or record any of the 10 energy values mea- sured in the Model 928A, you must select one of the measurement channels for voltage and the other for current. Choose either channel for voltage or current.
Page 55 Since energy values require time to accu- mulate, consider conﬁguring the Auto Shutdown fea- ture so that the 928A does not shut down during a measurement. Prior to collecting energy values, set the Auto Shutdown feature to OFF and use the exter- nal power supply.
Page 56: Wav - Waveform
WAV - Waveform To view or record signal waveforms on the 928A, select one or both of the measurement channels, for voltage and/or current. You can view up to two voltages, two currents or one voltage and one current. It does not matter which channel you select (A or B) to measure voltage or current.
Page 57 Channel B Combined Caution: For current probe use, see “CT Probe Use” on page 4.
Page 58: Hrm - Numerical Harmonics
HRM – Numerical Harmonics To view or record harmonics on the 928A, you must select one or both of the measurement channels, for voltage and/or current. You can view up to two volt- ages, two currents or a voltage and current. It does not matter which channel you select (A or B) to measure voltage or current.
Page 59: Graphical Harmonics
Graphical Harmonics To view a graphical representation of harmonics on the 928A, you must select one or both of the measurement channels, for voltage and/or current. The Model 928A allows you to view both voltages and currents, however it will allow you to view only one channel at a time.
Page 60: Flicker Information
Flicker Information In a sense, ﬂicker is deﬁned as a ﬂuctuation of the line voltage. It is a very speciﬁc problem related to human perception and incandescent light bulbs, but not a general term for voltage variations. The concept behind placing limits on voltage ﬂuc- tuations is that they cause lights to ﬂicker, which can be irritating and may cause discomfort.
Page 61: Flk - Instantaneous Flicker
By simply pressing FLK the 928A will display instantaneous ﬂicker based on the signals applied to channel A and/or B. To view ﬂicker on the 928A, you must select voltage for measurement channels A and/or B. 1. Press 2nd AV and/or 2nd 2.
Page 62: Pq - Power Quality, Sags And Swells
PQ – Power Quality, Sags and Swells Method The Model 928A measures sags, swells and power in- terruptions by using the PQ power quality triggering function. PQ follows the CBEMA method of mea- suring the signals at Channels A and B, comparing them to point limits over assigned time intervals.
Page 63 The 928A stores power quality (PQ) records of sags and swells as a list of dates, times, maximums and minimums while the trigger is active. After the trigger becomes Inactive, it will display them on the 928A. Any one proﬁle may consist of up to 10 Point Limits, with each point deﬁned over integer-multiples...
Page 64 PQ Proﬁles The Model 928A can store up to 5 distinct PQ proﬁles that may be conﬁgured using Mlink software and up- loaded into the 928A. Proﬁles are listed in the Model 928A as OFF, USER, PROF-1, . . . , PROF-5.
Page 65 Additionally, Channels A and Channel B may be con- ﬁgured independently. 1. To select a PQ Proﬁle, press PQ MENU. With the cursor, highlight either Chan- nel A or B and press ENT to open the proﬁle selection screen (seen in right screenshot). There will be 7 available choices: 5 PQ Proﬁles, 1 USER Proﬁle and OFF (to disable).
Page 66 USER Proﬁle Deﬁnitions Signal: Select either V for voltage, or I for current. Logic: Compares Signal (X) to Limit: select either X LIMIT, or X LIMIT. Limit: Logically compares the signal to this value: select any ﬂoating point number up to 1,000,000. HYS: Hysteresis: adds to the Limit value ( ) to reduce unnecessary events;...
Page 67 Model 928A. PQ Records When the signals measured at either Channel A or B exceed any Point Limit, the Model 928A will record the following values: ˆ Start & Stop Times ˆ MAX & MIN values within Start and Stop Times Press PQ to view recorded events by time and date.
Page 68: Trig - Working With Triggers
When these conditions match the deﬁned triggering limits, the 928A will record the start and stop times, and the maximum, or minimum signal value during the event (i.e. the date and time in which the trigger is active).
Page 69: Conﬁguring Triggers
Conﬁguring Triggers Note that you can only conﬁgure TRIG from the 928A itself, not in Mlink. To conﬁgure TRIG, press 2nd TRIG MENU. Once in this menu, step through each condi- tion and view or edit any value. There are 8 individual triggers available.
Page 70: A/B Function
A/B Function Use the A/B function to ﬁnd the ratio of the two mea- sured input signals to Channels A and B. If, for exam- ple, you wish to know the ratio of a voltage at channel A to a current a channel B, pressing the A/B button will display the results of dividing the voltage by the current giving resistance and phase oﬀset of Channel B from Channel A.
Page 71: B/A Function
B/A Function Use the B/A function in the same manner as you would with the A/B, only with the reverse response as with the A/B function and the same input signals. Use the B/A function to ﬁnd the ratio of the two measured input signals to Channels A and B.
Page 72: Hold - Hold Metered Value
When not in the measurement mode, the word “HOLD” will disappear. Procedure 1. Set up the 928A to measure the values you wish to observe. If necessary, see Conﬁguring Chan- nels A and B on page 23.
Page 73: Rcl - Recall Stored Values
STO. Records are replaced when storing a new record over the old record location. The Model 928A can store up to eight records using STO, and numbered from 1 to 8. Records are stored according to number, type, date and time as shown in the example below.
Page 74: Integration Key
Integration Key Purpose Use the Integration function to view a plot of the se- lected signal over time. Signals include voltage, cur- rent, frequency, phase and power factor. Conﬁgure the signal sampling interval from 1 to 65535 seconds. The vertical range scales according to the upper and lower limits that you conﬁgure.
Page 75: Axis Key
AXIS Key Use the AXIS key to conﬁgure how the Integration function plots the signal source. There are ﬁve cate- gories to set up in this menu. Graph Deﬁnitions Source Chan-A, Chan-B, freq, phase, PF Actpwr Interval From 1 to 65535, in seconds Graph Type Scroll or Fixed Axis Max...
Page 76: Log Key
LOG Key Purpose Use the LOG key to automatically record basic electri- cal data to the 928A ﬂash memory over a speciﬁed time interval. This function, also called AUTOLOG, makes it convenient to record measured electrical quantities while the equipment is unattended.
Page 77: Autolog Setup
Autolog Setup Always make sure to verify the time a date in the 928A before using the Autolog feature. See pages 20 and 21. 1. From the Autolog Info screen, press 2nd MENU. The Autolog Setup screen should ap- pear.
Page 78 The Autolog Time Mode is set when you set up the Time features. See Time Adjustment. Note: check the 928A Time and Date for accuracy prior to starting the Autologging. To adjust time and date, see pages 20 and 21.
Page 79: Mlink Software Tutorial
ˆ Uploading CT Proﬁles* ˆ Conﬁguring Power Quality Triggers ˆ Downloading Data Records ˆ Conﬁguring Custom User Screens ˆ Uploading New 928A Firmware * CT Proﬁles are current probe characterization ﬁles stored in the Model 928A that improve their ac- curacy.
Page 80: Download Mlink
— Install FTDI Driver on Windows XP 1. Unzip the downloaded ﬁle to a directory. 2. Connect the 928A to your computer via the in- cluded USB cable. Make sure that the 928A is powered on. 3. Windows XP — should give you a “Found New Hardware”...
Page 81: Linux Version
8. Click “Finish,” and it should be ready to use. Linux Version The Mlink Linux version is also available from Ar- biter, however it will only connect with the 928A if the drivers have been compiled in with the kernel. Some Linux distributions may have these drivers available.
Page 82: Installing Mlink
See Figure 5. Figure 5: Mlink Installation Screen Connecting to the 928A Prior to starting Mlink, make sure that: 1. The 928A is powered ON 2. The USB cable is connected between the pc and the 928A. Startup - USB Connection When starting Mlink for the ﬁrst time, you may be...
Page 83: Mlink Connection Window
COM3). It may take a few seconds to appear. Then, repeat step 1. 3. Under the Status column, it should indicate if the 928A (PSM) is detected or not. The unit se- rial number should appear - e.g. “PSM 00001109 Connected.”...
Page 84: Windows Xp Com Port Assignment
5. Restart Mlink and check for your COM port as per steps 1 - 3 above. 6. If the previous step does not work, then you may want to check which COM port Windows is us- ing. Sometimes it will not work properly if it assigns a port of COM 10 or higher.
Page 85: Mlink Main Window
Mlink Main Window Located on the main screen are six basic function but- tons as indicated in Figure 8. There are also several important functions found under one menu item called “Main”. On the lower-right of the status bar there is a connection light that strobes, notifying you of the con- nection status.
Page 86: Ct Proﬁles
(CT Characterization File) for the speciﬁc CT probes you use. In Mlink software, this characteriza- tion ﬁle is called a Proﬁle. The 928A can store up to 5 separate proﬁles for diﬀerent probes or diﬀerent characterizations for the same probe.
Page 87: To Erase Proﬁles
Mlink again to change the order or type of functions listed in the 928A User Screens. 1. Power on the 928A and connect the USB cable between the 928A and the computer. 2. Start Mlink and check for a green connection light! If red, go back to “Startup - USB Con-...
Page 88: Conﬁgure User Screens Window
Figure 10: Conﬁgure User Screens Window NOTE: Each user screen allows a maximum of seven items - the maximum number of lines on the 928A display. 5. To remove ﬁelds, select the desired ﬁelds in the Selected Fields box and click the left arrow.
Page 89: Download Trigger Records
Download Trigger Records The 928A allows you to quickly move event-triggered records to your pc using Mlink. Triggers must ﬁrst be deﬁned and activated in the 928A - see “TRIG – Working with Triggers” on page 54. Figure 11: Download Triggers Window 1.
Page 90: Conﬁgure Power Quality
Conﬁgure Power Quality Use this section to assist you in conﬁguring the 928A to detect sags and swells by using Point Limits similar to a CBEMA method. Make sure to review the section entitled “Power Quality – Sags and Swells” on page 48.
Page 91: Power Quality Settings
Power Quality Settings 1. Press ON to start the 928A and connect the USB cable between the 928A and the computer. 2. Start Mlink and check for a green connection light! If red, go back to “Startup - USB Con- nection.”...
Page 92: Conﬁgure Point Limits
Conﬁgure Point Limits Mlink allows you to set up ten point limits for each of the ﬁve proﬁles. Point Limits allow you to setup dif- ferent stages of triggering tailored to monitor voltage (or current) sags and swells. Set up each point limit in the same manner, and place them in any order.
Page 93: User Proﬁle
Dwell: during trigger condition, sets the number of input signal half-cycles that must occur before recording begins: an integer number. Click OK to install PQ Proﬁles in the 928A, or Cancel to quit without making any changes. User Proﬁle One selection named USER is available with one Point Limit that is only accessible from the 928A keypad.
Page 94: Off - Deactivate Pq Trigger
(using the LOG key) to your pc. To conﬁgure Au- tologging see “LOG Key” on pages 62ﬀ. To transfer records from the 928A to the pc, you will need to have some records already stored in the 928A ﬂash memory module. Logging is based on start and stop times and dates.
Page 95: Download Power Quality Records
Standard Log Records or for Trigger Records, and requires that records be stored in the 928A ﬂash memory module. 1. Power on the 928A and connect the USB cable between the 928A and the computer. 2. Start Mlink and check for a green connection light! If red, go back to “Startup - USB Con-...
Page 96: Uploading New Firmware
The ﬁrmware ﬁle is in a zipped format and Mlink automatically unzips it. 2. Select the ﬁle and click OPEN and you should see the progress as shown in Figure 14. The 928A displays “FLASH PROGRAM IN PROGRESS” during the installation. Click OK when ﬁnished.
Page 97: Functional Description
Functional Description Introduction The Model 928A is a two-channel, AC power mea- surement instrument, providing 0.1% accuracy in a handheld package. Besides voltage, current and power quantities, it measures power quality, including har- monics, ﬂicker, sags, surges and interruptions. Also, it includes a graphical display, internal clock, approxi- mately 400 KB of ﬂash for data storage, and full-time...
Page 98: Details
Details Input Sections Two identical input channels (A and B) allow users to connect to voltage sources (0 to 660 Vrms) and to current sources (0 to 1.2 Arms or 0 to 1.2 Vrms), de- signed to work with a CT up to approximately 1000 A.
Page 99: Dsp
Current Output CT Lead Set CA0027100 (current output): This accessory current lead set connects directly between a Model AP0009800 CT, or similar current output CT, and the Model 928A current terminals using safety banana connectors. It is constructed of high-quality silicone-insulated, ﬁne- stranded wire for durability and safety.
Page 100: Voltage Measurement
CT, lead sets and manual. USB Data Cable Use CA0026106 USB cable when connecting the Model 928A to a computer. For conﬁguring the Model 928A or downloading data from the ﬂash memory module, use Mlink software.
Page 101: Speciﬁcations
Speciﬁcations Input Input Conﬁguration The Model 928A has two identical measurement chan- nels, Channel A and Channel B. Each input channel has a voltage input and a current input. Current in- puts are intended for use with external CT having a nominal output of 0-1 Arms or 0-1 Vrms.
Page 102: Voltage
Voltage Input Range: 1 to 660 Vrms Impedance: 1.2 megohm, diﬀerential Current Input Range (I): 0.01 to 1.2 Arms (underrange* to 1 mA) Input Range (V): 0.01 to 1.2 Vrms (underrange* to 1 mV) Burden: 0.01 Ohm max. or 100 kilohms, min. *For underrange, turn Low Range mode ON.
Page 103: External Power Supply
External Power Supply Part number: AP0011200. Type: +7 Vdc, regulated; 5 W Measurements Voltage and Current Method: True rms, 3 kHz Bandwidth Accuracy: 0.1% of reading (voltage) or 5 mV, whichever is greater 0.1% of reading (current) + CT errors 1% of reading + CT errors (low range) Phase Angle, A to B Range:...
Page 104: Waveform
0.1% of VA, for VA, VAR, and W 0.001 PF General Physical Size: 200.0 x 104.2 x 37.4 mm (7.9 x 4.1 x 1.5 in.) Weight: 18 oz (928A only, with batteries) Environmental Temperature: Operating: -10 to +50 C Nonoperating: -40 to +75 C Humidity: Noncondensing...
Page 105: Ac Power Adapter
Part number AP0011200. For benchtop or continuous use with available line power, use the AP0011200, AC Power Adapter. It provides a regulated +7 Vdc at up to 800 mA to the 928A. Input Connector: 5.5 2.0 mm, center pos. Input Voltage:...
Page 106: Mn352 Current Probe
-40 to +70 C Operating Humidity: 85% (10 – 35 C) Weight: 180g (6.5 oz) *1.2 Vrms is the input limit on the 928A (current in- put). BEFORE USING PROBE: Please read section entitled “Caution: CT Probe Use” on page 4.
Page 107: Keypad Deﬁnitions
Keypad Deﬁnitions This appendix lists all of the keys on the Model 928A keypad, for both the primary and secondary purposes. For Primary keys, press only the key itself. For sec- ondary keys, press and then the key with blue label above the key button of choice.
Page 108 A and B, from the 2nd to the 50th, in tabular form. ON key – press to switch the 928A on and oﬀ. Power Factor & Apparent Power key – press to display the Power Factor and Apparent Power in Volt-Amps.
Page 109: Secondary Keys
rent energy values; press again to view Q-hours. Backspace key – press to move left in any conﬁguration screen, to erase any numerical value, or to restart a process (e.g. the Integration graph). Also, press to enter a negative number during conﬁguration. Up and Down arrow keys –...
Page 110 Download Log Records in Mlink to retrieve records to computer. Menu key – press to access the various 928A systems conﬁguration screens. MIN/MAX key – press to cycle through the four diﬀerent measurement modes: min- imum, maximum, average and normal (measurement mode).
Page 111: Ct Input Connector
CT Input Connector 928A Current Input Connector The 928A Channel A and B Current Inputs allow two types of output signals from the CT: voltage or cur- rent. These CT output signals are limited to 1.2 Vrms and 1.2 Arms. Pin locations and their descriptions for these two connectors are given in the drawings and photos that follow.
Page 112: Ct Cable Connector
CT Cable Connector Figure 16: CT Cable Connector – side view Figure 17: CT Connector End View...
Page 113: Phase Conventions
Phase Conventions This appendix contains supplemental material for de- termining how the Model 928A responds to the vari- ous settings contained in the Phase/Freq Preferences menu. The 928A allows you to select the reference channel, lag polarity, range ( 180 or 0 to 360 ), lead-lag dis- play ON or OFF, frequency source (A or B) and fre- quency (50 or 60 Hz).
Page 115: Ce Mark Certiﬁcation
CE Mark Certiﬁcation...
Page 116 Date of Issue: June 11, 2008 Directives: 89/336/EEC Electromagnetic Compatibility 73/23/ EEC Low Voltage Safety Model Number(s): 928A Power System Multimeter Manufacturer: Arbiter Systems, Inc. 1324 Vendels Circle, Suite 121 Paso Robles, CA 93446 Harmonized Standard Referenced: EN55011 Class A, Radiated and Conducted...
Page 117 Index F, 34 calibration info, 18 2nd key, 5 CE Mark Cert., 101 copyright, v A/B key, 56 example, 26 active power, 36 lead set, 85 ADC, 84 probe apparent power, 38 MN352, 29 Appendix selection, 25 A, 93 current B, 97 low-range mode, 26 C, 99...
Page 118 FLK key, 47 A/B, 93 frequency preference, 17 AI, 95 FTDI driver, 66 AV, 95 function keys AXIS, 95 primary, 5 B/A, 95 secondary, 5 backspace, 95 functional description, 83 BI, 95 CT lead set, 85 BV, 95 DATE, 95 DSP, 85 ENT, 93 input sections, 84...
Page 119 LOG key, 62 battery, 6 low range mode, 26, 88 power factor, 38 power ON/OFF, 6 max input rating, 32 power quality MENU key, 15 conﬁgure, 76 MIN/MAX key, 13 conﬁgure point lim- Mlink its, 78 conﬁg f1 key, 73 deactivate trigger, 80 conﬁgure PQ, 76 download records, 81...
Page 120 environmental, 90 viewing, 54 MN352 CT probe, UP/DOWN keys, 14 upload physical, 90 CT proﬁles, 72 input section, 87 new ﬁrmware, 82 measurements, 89 frequency, 89 cable, 86 harmonics, 89 startup, 68 phase angle, 89 user interface, 83 power & energy, 90 voltage &...

Arbiter Systems 928A User Manual

Introduction

Getting Started

Operation

Mlink Software Tutorial

Functional Description

Speciﬁcations

Keypad Deﬁnitions

CT Input Connector

Phase Conventions

CE Mark Certiﬁcation

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