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GUIDELINE 6623A-600S Operator's Manual

High current range extender
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Operators Manual
For The
6623A-600S
High Current Range Extender
www.guildline.com
NOTICE
The contents and information contained in this manual are proprietary to
Guildline Instruments Limited. They are to be used only as a guide to the
operation and maintenance of the equipment with which this manual was
issued and may not be duplicated or transmitted by any means, either in whole
or in part, without the written permission of Guildline Instruments Limited.
OM6623A-600S-A1-00
01 September 2021

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  • Page 1 Operators Manual For The 6623A-600S High Current Range Extender www.guildline.com NOTICE The contents and information contained in this manual are proprietary to Guildline Instruments Limited. They are to be used only as a guide to the operation and maintenance of the equipment with which this manual was issued and may not be duplicated or transmitted by any means, either in whole or in part, without the written permission of Guildline Instruments Limited.

  • Page 2: Table Of Contents

    MEASUREMENT OPERATION GUIDE ....................3-1 3.1.1. Low Ohm Mode Resistance Measurement with the 6623A-600S..............3-1 3.1.2. Recommended Test Setup Limits and Precautions for 6623A-600S ............3-3 INSTRUMENT OPERATION ..................4-1 4.1. FRONT PANEL OPERATING PROCEDURE ................... 4-1 VERIFICATION AND CALIBRATION ..............5-1 5.1.
  • Page 3 PROCEDURE ..............................5-2 5.3.1. PRELIMINARY MEASUREMENT OF THE 9230A-30-0.1Ω SHUNT ........... 5-2 5.3.2. VERIFICATION OF THE x10-3A RATIO OF THE 6623A-600S RANGE EXTENDER ....... 5-2 5.3.3. VERIFICATION OF THE x100-30A RATIO OF THE 6623A-600S RANGE EXTENDER ....5-4 5.3.4. VERIFICATION OF THE x1000-600A RATIO OF THE 6623A-600S RANGE EXTENDER ....5-6 TROUBLESHOOTING AND MAINTENANCE ............

  • Page 4: List Of Figures

    LIST OF FIGURES FIGURE 1-1 : MODEL 6623A-600S BLOCK DIAGRAM WITH 9920 BRIDGE ..........1-4 FIGURE 2-1 : INPUT FUSE ACCESS ........................2-6 FIGURE 2-2 : 6623A-600S CONNECTIONS WITH 9920..................2-8 FIGURE 2-3 : 6623A-600S FRONT VIEW ........................ 2-11 FIGURE 2-4 : 6623A-600S REAR VIEW ........................2-12 FIGURE 5-1 : REAR PANEL CONNECTIONS –...

  • Page 5: List Of Tables

    LIST OF TABLES TABLE 2-1 : FUSE RATINGS ............................2-6 TABLE 3-1 : 6623A-600S RECOMMENDED TEST SETUPS WITH 9920/A DCC BRIDGE ......3-4 TABLE 7-1 : GENERAL SPECIFICATIONS ......................7-1 TABLE 7-2 : GENERAL SPECIFICATIONS (CONTINUED) ................7-2 OM6623A-600S-A1-00 01 September 2021...

  • Page 6: Introduction

    1.2. GENERAL DESCRIPTION The Model 6623A-600S Current Range Extender is designed to extend the test current and measurement range of the Guildline Instruments 9920/A DCC Resistance Bridges. The extender is essentially a direct current transformer with primary windings which produce an output current that varies directly with the input current.

  • Page 7: Overview

    1.3. OVERVIEW The Model 6623A-600S Current Range Extender is a precision, fixed ratio, direct current transformer based on the principle of the direct current comparator. Figure 1-1 illustrates the instrument circuits in block diagram form with the connections to the 9920/A Bridge.

  • Page 8: Principle Of Operation

    A single current comparator toroidal transformer with associated servo and modulator circuits is utilized in the 6623A-600S. Ratios of 10:1, 100:1 and 1,000:1 are implemented with three primary windings on the current comparator transformer.

  • Page 9: Figure 1-1 : Model 6623A-600S Block Diagram With 9920 Bridge

    Toroid 66259 Servo Amplifier 66259 Extender Extender Flux Detector Control Unit Demodulator Control Magnetic Unit Modulator Slave PSU Current Comparator Toroid Bridge 9920 DCC Bridge Galvanometer Figure 1-1 : Model 6623A-600S Block Diagram with 9920 Bridge OM6623A-600S-A1-00 01 September 2021...

  • Page 10: Installation

    208 Volts to 240 Volts in a frequency range of 50 Hz to 60 Hz. See Table 2-1 for the correct fuse selection if required. Where the molded plug on the line cord supplied with the 6623A-600S does not match the local power outlet sockets, the plug can be removed and replaced with one that does fit the local service.

  • Page 11: Fuse Selection Or Replacement

    Section 2 2.1.3. Fuse Selection or Replacement Only fuses with specified current rating type should be used for replacement if necessary. See Table 2-1 below. 6623A-600S FUSES (TIME DELAY TYPE) 208 V 220 V 240 V 8A, 250V, (T) 8A, 250V, (T)

  • Page 12: Setup And Power On

    Unit to the AC power outlet. e. Turn on the power switch to the 9920/A Bridge. f. Turn on the power switch to the 66259 and then to 6623A-600S. You should see the red and yellow “POWER” and “FAULT” indicators on the front panel light up.

  • Page 13: Figure 2-2 : 6623A-600S Connections With 9920

    Section 2 CIRCUIT EARTH 1.000 060 CK1 CK2 READ Nx 10 Nx 1 EXT. POWER SUPPLY 66259 EXTENDER BRIDGE x1000 600A MAX x100 30A MAX 3A MAX BRIDGE Figure 2-2 : 6623A-600S Connections with 9920 OM6623A-600S-A1-00 01 September 2021...

  • Page 14: Incoming Inspection

    Step 4) Turn on the 9920/A, the 66259 and then the 6623A-600S in sequence. Note: Do not power on the 6623A-600S with a shunt resistor connected to the current output terminals on the back panel. Step 5) Disconnect the leads connected to the Rx C1 and C2 terminals of the 9920/A and connect them to the C1 and C2 terminals of the x10-3A range on the back panel of the 6623A-600S.
  • Page 15 The difference should be less than +/- 0.00001 ohms depending on the stability of the resistors used in the test. Note: This is not the 6623A-600S full rated accuracy but serves a functional test for the purposes of determining the instrument has been received in proper working order.

  • Page 16: 6623A-600S Front Panel

    Section 2 2.3. 6623A-600S FRONT PANEL There are no controls on the front panel of the 6623A-600S. Figure 2-3 : 6623A-600S Front View 2.3.1. Power The power-on indicator is lighted when the AC power is applied to the unit and the power switch on the rear panel is “ON”.

  • Page 17: 6623A-600S Rear Panel Connectors And Controls

    Section 2 2.4. 6623A-600S REAR PANEL CONNECTORS AND CONTROLS BRIDGE RANGE FREQ FUSE POWER 50/60Hz 8A (T) 1900 VA x1000 600A MAX Figure 2-4 : 6623A-600S Rear View 2.4.1. Line Input Connector The Line Input Connectors are a combination of a 3-prong AC standard male connector, an ON/OFF switch and a fused line input with access for fuse replacement.

  • Page 18: Quick Measurement Guide

    MEASUREMENT OPERATION GUIDE This section contains information regarding the measurement of resistors in the range of 1µ ohm to 10 ohms. This guide is provided for manual control of the 6623A-600S. 3.1.1. Low Ohm Mode Resistance Measurement with the 6623A-600S The 9920/A in its Low Ohm Mode with the 6623A-600S enables measurement of resistors below 10 ohms with test currents above 1 A.
  • Page 19 9920/A using polarity reversal function on the Extender control Unit such that the test current of the 6623A-600S will be reversed when the polarity is selected. Note that the polarity reversal switch on the 9920/A will not be functional when the range extender is connected.

  • Page 20: Recommended Test Setup Limits And Precautions For 6623A-600S

    Section 3 3.1.2. Recommended Test Setup Limits and Precautions for 6623A-600S See Table 3-1 for the recommended test setups. Note that the current in the standard resistor is controlled by the resistance of the TEST resistor to be measured and the extender current such that the potentials across each resistance...

  • Page 21: Table 3-1 : 6623A-600S Recommended Test Setups With 9920/A Dcc Bridge

    0.01 0.1xx Table 3-1 : 6623A-600S Recommended Test Setups with 9920/A DCC Bridge Note: If the oscillator light on the 9920/A should become extinguished at any time the current selection of the Model 66259 Extender Control unit must be disabled immediately.

  • Page 22: Instrument Operation

    INSTRUMENT OPERATION 4.1. FRONT PANEL OPERATING PROCEDURE The 9920/A Bridge and 6623A-600S Current Range Extender are manually operable only. The Model 9920/A Technical Manual describes the full detailed operating instructions for manual operation of the bridge. Section 3 provides basic instructions as a quick guide to making measurements with the 6623A-600S.

  • Page 23: Verification And Calibration

    This procedure covers the ratio accuracy verification of the 6623A-600S Current Range Extender. 5.1.1. Purpose The purpose of this procedure is to assure that the 6623A-600S Current Range Extender meets the manufacturer’s specifications. It is recommended that these procedures be performed after any corrective maintenance activity, or if the operator perceives a problem with respect to ratio accuracy or test current accuracy.

  • Page 24: Procedure

    Turn off the 9920/A and reconfigure the bridge with the 6623A-600S Range Extender and the 66259 Extender Control Unit as shown in Figure 2-2. Turn on the 9920/A, the 66259 and then the 6623A-600S in sequence. Do not power on extender with a shunt connected.
  • Page 25 9920/A using polarity reversal function on the Extender control Unit such that the test current of the 6623A-600S will be reversed when the polarity is selected. Note that the polarity reversal switch on the 9920/A will not be functional when the range extender is connected.

  • Page 26: Verification Of The X100-30A Ratio Of The 6623A-600S Range Extender

    0.1ppm. Record the result of the measurement. Move the leads from the 6623A-600S Extender x10-3A range terminals to the x100-30A range terminals as shown in Figure 5-1. Measure the ohm value of the 9230A-100-0.01Ω Shunt as above with an initial ratio dial setting of 1.00xx and a test current of 3 A.

  • Page 27: Figure 5-1 : Rear Panel Connections - 6623A-600S, X100-30A Range

    CIRCUIT EARTH 1.000 060 CK1 CK2 READ Nx 10 Nx 1 EXT. POWER SUPPLY 66259 EXTENDER BRIDGE x1000 600A MAX x100 30A MAX 3A MAX BRIDGE Figure 5-1 : Rear Panel Connections – 6623A-600S, x100-30A Range OM6623A-600S-A1-00 01 September 2021...

  • Page 28: Verification Of The X1000-600A Ratio Of The 6623A-600S Range Extender

    RANGE EXTENDER Replace the 9230A-100-0.01Ω Shunt with the 9230A-300-0.001Ω Shunt. Measure the value of the 9230A-300-0.001Ω Shunt with the 6623A-600S Extender x100-30A range as in 5.3.3.6, but use a test current value of 30A and a ratio dial setting of 0.10xx.

  • Page 29: Figure 5-2 : Rear Panel Connections - 6623A-600S, X1000-600A Range

    CIRCUIT EARTH 1.000 060 CK1 CK2 READ Nx 10 Nx 1 EXT. POWER SUPPLY 66259 EXTENDER BRIDGE x1000 600A MAX x100 30A MAX 3A MAX BRIDGE Figure 5-2 : Rear Panel Connections – 6623A-600S, x1000-600A Range OM6623A-600S-A1-00 01 September 2021...

  • Page 30: Troubleshooting And Maintenance

    Preventive maintenance is limited to checking the instrument operation, test current accuracy. The Service Manual available on request from Guildline Instruments Limited provides complete alignment and test information required if the 6623A-600S fails to meet performance specifications in section 5. 6.1.5.

  • Page 31: Resolving Connection Problems

    Section 6 6.1.6. Resolving Connection Problems Attach a suitable DVM to the bridge front panel RxP1 and RxP2 terminals. When initiating the measurement, select a positive test current and observe that the RxP2 terminal voltage is positive with respect to the RxP1 terminal and is of a value equal to the test current times the shunt resistance value and agrees with the displayed value.

  • Page 32: Appendices

    D 29.1 , W 20.7 , H 8.75 Table 7-1 : General Specifications NOTE: 1. The 6623A-600S Current Range Extender is always configured for 208 to 240 VAC 50/60 Hz operation at the point of shipment. No voltage selection is required in this range.

  • Page 33: Resistance Measurement Specification

    7.3. RESISTANCE MEASUREMENT SPECIFICATION The combined resistance measurement specification of the 6623A-600S with the 9920/A Bridge in Low Ohms mode of operation depends on the specific ratios utilized. For best operation the bridge ratio should be close to 1.0. Refer to the 9920/A Technical Manual for specific bridge performance specifications.

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