Related Manuals for Arbiter Systems 918B
Summary of Contents for Arbiter Systems 918B
- Page 1 Model 918B Phase Angle Multimeter Operation Manual Arbiter Systems, Inc. Paso Robles, California U.S.A. Printed in U.S.A.
- Page 2 This manual is issued for reference only at the convenience of Arbiter Systems. Arbiter Systems has made reasonable effort to verify that all diagrams, to the best of our knowledge, are accurate as of September 5, 2001. However, due to production changes and availability of parts, these diagrams are subject to revisions and modifications.
- Page 3 Model 918B PHASE ANGLE MULTIMETER Operation Manual Arbiter Systems, Inc. 2001. All rights reserved. International copyright secured. PD0010600C...
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Page 5: Table Of Contents
Table of Contents Table of Contents ..............v 1.0 Introduction..............1 1.1 Features..................1 1.2 Accessories Included ..............3 1.3 Accessories Available..............3 1.4 International Power..............3 1.5 Safety Precautions ............... 4 1.6 Factory Service ................5 Extended Warranty ................6 2.0 Operation................. - Page 6 4.2 Calculated Parameters ............... 49 4.3 General Specifications............... 50 Warranty ................53 List of Figures Figure 1 – 918B Front Panel ............. 7 Figure 2 – Phase Convention, Lead 0 - 360º........16 Figure 3 – Current Transformer Orientation ........26...
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Page 7: Introduction
This manual provides operating instructions and specifications for the Arbiter Systems Model 918B Phase Angle Multimeter. 1.1 Features The Model 918B Phase Angle Multimeter is a compact, microprocessor-controlled instrument capable of ten functions, which have been optimized for use in applications involving AC power transmission and distribution. - Page 8 Introduction The 918B accepts inputs via two pairs of front panel jacks; one pair for voltage, and one pair for current (optional adapters allow voltage-to-voltage phase measurements). The voltage connections are made directly to the circuit under test, using leads included with the instrument.
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Page 9: Accessories Included
Introduction 1.2 Accessories Included The following accessories are included with the 918B Phase Angle Multimeter: • Test probe kit, with screw-on adapters; part no. AP0002000A • Battery charger, 120 vac/60 Hz; part no. AP0001100A (see "International Power" below for other line voltages and frequencies) •... -
Page 10: Safety Precautions
Do Not Connect (-) Input Terminal to Voltages in Excess of ± ± ± ± 25 Volts From Earth Ground. The 918B was designed for use with the (-) input connected to ground or circuit neutral. Application of more than ±25 volts with respect to earth ground may result in the potential for electric shock or damage to the instrument. -
Page 11: Factory Service
Replace Fuses with the Proper Size and Type. A pair of ¼ amp, 250 volt, 2AG type fast-blow fuses protect the current inputs of the 918B (Arbiter Systems part number FU0001603A). Replace only with fuses of the same type and rating. -
Page 12: Extended Warranty
Introduction Extended Warranty Arbiter Systems also offers an extended warranty available in one year increments. You may purchase the extended warranty at any time before your standard one year warranty expires. Please contact our sales department for more information about our extended... -
Page 13: List Of Figures Figure 1 - 918B Front Panel
USE "HOLD" KEY TO CHANGE CT RATIO USE "PHASE" KEY TO CHANGE PHASE MODE RANGE Vrms Arms W/Whr HOLD ∆ PHASE START SHIFT MIN/MAX PHASE FREQ CURRENT TRANSFORMER TERMINALS ARE AT SAME POTENTIAL AS (–) VOLTAGE INPUT. USE PROPER PRECAUTIONS. Figure 1 – 918B Front Panel... -
Page 15: Operation
Caution Do not exceed ±25 volts peak, with respect to earth ground on the (-) voltage input. The 918B is designed to operate with the (-) input connected to earth ground or circuit neutral. -
Page 16: Operation From The Internal Battery
A high charging rate is applied initially, until the battery is near full capacity. After this, a lower, "trickle" charge rate is used, allowing the 918B to be connected to the ac line indefinitely without danger of overcharging. -
Page 17: Auto Power-Off
2.2 Power On To begin operation of the 918B, first verify that any voltage and/or current connections to the inputs are in compliance with the limits shown on the front panel. Press the front panel button labeled "POWER". - Page 18 The standard clamp-on current transformer included with the 918B has a ratio of 1000:1. The step-down ratio of other current transformers to be used in conjunction with the 918B is dependent on the range of currents to be measured.
- Page 19 Note: The calibration constants for this configuration apply specifically to the 20A clamp-on CT supplied with, and having the same serial number as the 918B. Use of other CTs may result in reduced accuracy. 2A DIRECT, Accessory CT Calibrated for the Arbiter Systems 09182A 100:1 2.0A plug-in...
- Page 20 2.2.1.2 Changing the Phase Convention When used for measurement of the phase angle between a voltage and current, the 918B will display a value, which is dependent upon the phase convention that is being employed. There are four selections available for phase convention.
- Page 21 Example: Phase Convention, Lead; 0 – 360 A measurement example using the standard 918B phase convention is illustrated in Figure 2 of this manual, and also, for reference, on the back panel of the instrument. This diagram shows the values for different measurement modes which will be displayed when 100 Vrms and 1.0 Arms signals are applied to the voltage and current...
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Page 22: Figure 2 - Phase Convention, Lead 0 - 360º
Operation 100 Vrms 1.0 Arms Current Lags Voltage Example: Phase 0.500 50.0 86.6 Figure 2 – Phase Convention, Lead 0 - 360º... - Page 23 Changing the Phase Convention To change the phase convention, use the following procedure: 1. Turn the 918B off. 2. Turn the 918B back on. A two-second display will occur showing the selected current transformer configuration. Immediately following this, another display will occur showing one of the four phase convention settings from above, depending on which one had been previously selected and stored.
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Page 24: Measurement Of Dc Volts
Operation 2.3 Measurement of DC Volts The 918B can measure dc voltages of between 0.2 and 1000 volts. For measurement of dc voltage, the current input is not used. CAUTION Do not exceed ±25 volts peak, with respect to earth ground, on the (-) voltage input. -
Page 25: Measurement Of Ac Volts
For measurement of ac voltage, the current input is not used. CAUTION Do not exceed ±25 volts peak, with respect to earth ground on the (-) voltage in put. The 918B is designed to operate with the (-) input connected to earth ground or circuit neutral. Procedure 1. -
Page 26: Measurement Of Ac Amperes
Voltage Ranges For the voltage input, the 918B has four different operating ranges. Depending on the level of voltage applied to the input, the instrument may automatically switch between ranges. This range switching is internal, and may or may not be evident in the display. - Page 27 "Arms". 2. Connect the output of the clamp-on current transformer (CT) to the current input of the 918B, using the supplied cable. Be sure that the (+) and (-) terminals on the CT correspond directly to the (+) and (-) terminals of the 918B current input.
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Page 28: Measurement Of Volt Amps (Apparent Power)
CAUTION Do not exceed ±25 volts peak, with respect to earth ground, on the (-) voltage input. The 918B is designed to operate with the (-) input connected to earth ground or circuit neutral. - Page 29 Operating Ranges For voltage inputs, the 918B has four different operating ranges. For current inputs, the 918B has three different operating ranges. De- pending on the levels of voltage and current applied to the inputs, the instrument may automatically switch between ranges.
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Page 30: Measurement Of Volt Amps Reactive (Reactive Power)
20,000. (For instructions on using other current transformers with different ratios, refer to section 2.2.1.1). For measurement of vars with the 918B, both the voltage and the current inputs are used. CAUTION Do not exceed ±25 volts peak, with respect to earth ground, on the (-) voltage input. - Page 31 "VAR". 2. Connect the output of the clamp-on current transformer (CT) to the current input of the 918B, using the supplied cable. Be sure that the (+) and (-) terminals on the CT correspond directly to the (+) and (-) terminals of the 918B current input.
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Page 32: Figure 3 - Current Transformer Orientation
For the circuit below, with a phase angle of zero between voltage and current, the 918B will indicate zero degrees phase. CLAMPON CT + – + –... -
Page 33: Measurement Of Watts (Active Power)
Flashing Display – Input Low In var mode, minimum values of voltage and current must be present at the inputs to maintain accuracy. The 918B display will indicate when the voltage and/or current fall below their minimum values. If an input value falls below the bottom of the lowest range in auto-range mode, or below the bottom of a held range, the display will begin to flash. - Page 34 For active power measurements with the 918B, both the voltage and current inputs are used. CAUTION Do not exceed ±25 volts peak, with respect to earth ground, on the (-) voltage input. The 918B is designed to operate with the (-) input connected to earth ground or circuit neutral. Procedure 1.
- Page 35 In the “watts” mode, minimum values of voltage and current must be present at the inputs to maintain accuracy. The 918B display will indicate when the voltage and/or current fall below their minimum values. If an input value falls below the bottom of the lowest range in auto-range mode, or below the bottom of a held range, the display will begin to flash.
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Page 36: Measurement Of Power Factor
The 918B is capable of displaying any power factor value between +1 and -1. For measurement of power factor with the 918B, both the voltage and the current inputs are used. CAUTION Do not exceed ±25 volts peak, with respect to earth ground, on the (-) voltage input. - Page 37 Flashing Display – Input Low In power factor mode, minimum values of voltage and current must be present at the inputs to maintain accuracy. The 918B display will indicate when the voltage and/or current fall below their minimum...
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Page 38: Measurement Of Frequency
CAUTION Do not exceed ±25 volts peak, with respect to earth ground, on the (-) voltage input. The 918B is designed to operate with the (-) input connected to earth ground or circuit neutral. - Page 39 Flashing Display – Input Low For the frequency mode, a minimum value of voltage or current must be present at one of the inputs to maintain accuracy. The 918B display will indicate when the voltage and/or current fall below their...
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Page 40: Measurement Of Phase Angle
918B, both the voltage and current inputs are used. CAUTION Do not exceed ±25 volts peak, with respect to earth ground, on the (-) voltage input. The 918B is designed to operate with the (-) input connected to earth ground or circuit neutral. - Page 41 918B, using the supplied cable. 2. Be sure that the (+) and (-) terminals on the CT correspond directly to the (+) and (-) terminals of the 918B current input. Clamp the CT around the wire carrying the current to be measured, making certain that the jaws close completely.
- Page 42 Hold Mode When making measurements using any of the operating modes of the 918B, you can "freeze" the values for all measured parameters by simply pressing the "HOLD" button. You can then switch between all of the different modes and determine their respective values at the time "HOLD"...
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Page 43: Special Functions And Features
3.0 Special Functions and Features The Model 918B Phase Angle Multimeter has a number of functions and features, which allow performance of specialized measurement tasks, some which would not even be possible with an ordinary single-phase meter. This section describes how to utilize the special capabilities of the 918B. - Page 44 Special Functions and Features 1000:1 Current Transformer (09111A, 09182B): Display Digits Range Low High 1 2 3 4 5 6 7 8 0.02A 0.2A X . X X X 0.2A X . X X X (<10A) X . X X X (≥10A) X X .
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Page 45: Automatic Range Selection
3.1.3 Manual Range Selection The 918B has a provision for manually selecting and holding a particular measurement range. This can be done for either the voltage or current mode, or both. - Page 46 OVLD – Out of Range Indication If a range is held, and the upper limit of the range is exceeded by more than approximately 10%, the 918B will indicate an out-of- range condition by displaying the message "OVLD!" When the instrument is operated in one of the modes which utilize...
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Page 47: Minimum And Maximum Value Storage
Special Functions and Features 3.2 Minimum and Maximum Value Storage The Minimum/Maximum function of the 918B allows continuous monitoring of all operating modes, with automatic recording of the lowest and highest values for each. Regardless of the particular mode that the instrument is in, recording of min/max values for all modes will be taking place. -
Page 48: Using Delta Phase For Phase Comparison Measurements
3.3 Using Delta Phase for Phase Comparison Measurements The 918B features a Delta Phase function, which allows phase comparisons between two signals at the same frequency, using a third synchronous signal as a reference. This permits measurement of the phase relationship between, for example, all of the phases in a three-phase system. -
Page 49: Using Fixed Offsets In Delta Phase Mode
Delta Phase operation, the operator has the choice of entering offset values of 30, 60, or 90 degrees lag (current lagging voltage). After selecting the offset value, the 918B will indicate zero because the phase angle at the inputs is equal to the offset value. -
Page 50: Watt-Hour Measurement
3.4 Watt-Hour Measurement The Model 918B has a provision for measurement of watt-hours. Watt-hour recording begins as soon as the instrument is turned on. Procedure 1. To review watt-hours as they are accumulated, press the "W"... -
Page 51: Making Voltage-To-Voltage Phase Angle Measurements
Measurements Continuous phase angle measurements between two voltage sources can be performed with the 918B, using an optional Auxiliary Voltage Adapter (Arbiter Systems Model 09184A). The adapter is plugged into the current input and a single test lead is used to connect to the second voltage source. -
Page 53: Specifications
Current (RMS, with Supplied 1000:1 Current Transformer Note These specifications apply to operation using the 20A clamp- on CT supplied with, and having the same serial number as the 918B. Use of other CTs may result in reduced accuracy. Ranges (automatic or manual selection) Range 1: 0.02 to 0.2 A... -
Page 54: Phase
Specifications Phase Range: 0 to 360 degrees Resolution: 0.1º Accuracy: ±0.5 degrees typical ±1.0º maximum, with supplied clamp-on CT and current greater than 0.1 Arms and voltage greater than 1 Vrms Frequency Range: 45 to 500 Hz Accuracy: ±(0.01% of reading + 1 digit) Resolution: 0.01 Hz for frequencies less than 100 Hz 0.1 Hz for frequencies of 100 Hz or more. -
Page 55: Calculated Parameters
Specifications 4.2 Calculated Parameters Volt-Amps Calculated as the product of the rms voltage and the rms current. Range: 0.004 VA to 20 kVA (with supplied 1000:1 current transformer) Accuracy: Derived from the individual uncertainties of the voltage and current measurements. ±1.5% of reading, max. -
Page 56: General Specifications
Specifications Power Factor Range: -1.0 to +1.0, lead or lag Accuracy: Derived from the uncertainty of the phase angle measurement ±0.01 max. Watt Hours Calculated from power sampled at a rate of once per second. 0 to ±9999 kWh Range: Accuracy: Derived from the individual uncertainties of the voltage, current, and phase measurements. - Page 57 Specifications Physical Characteristics Outline Dimensions: 182mm H x 122mm W x 43 mm D (7.2" x 4.8" x 1.7") Weight: Instrument: 1 kg (2.2 lbs) Shipping: 2.3 kg (5 lbs) Environmental Temperature: Operating range: 0° to 50°C Operating, typical.: 25°C Storage range: -40°...
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Page 59: Warranty
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... - Page 60 Warranty The remedies provided herein are Buyer's sole and exclusive 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. FOR THE FASTEST POSSIBLE SERVICE, SHOULD...
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