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Model 9230A Series
Precision DC Current
Shunt Standards
Technical Manual
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.
TM9230A-C1-00
2 November, 2021
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Summary of Contents for Guildline 9230A Series
- Page 1 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.
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Page 3: Table Of Contents
Table of Contents Introduction Warranty To Obtain Warranty or Calibration and Repair Service Safety Information 9230A Series Precision dc current shunt Specifications 9230A Model Series 12 Month Specifications Overview General Design Considerations Measurement Ranges Design Configurations 3.4.1 10 A to 150 A Standard Shunt Values 3.4.2... - Page 4 List Of Figures Figure 3-1 : 9230A Series from 10 A to 150 A Full Scale Current ......... 3-3 Figure 3-2 : 9230A Series from 300 A to 500 A ..............3-4 Figure 3-3 : 9230A Series from 1000 A to 5000 A ..............3-5 Figure 3-4 : Single Cable Connection, 0 to 500 A ..............
- Page 5 List Of Tables Table 2-1 : 9230A Model Series 12 Month Specifications ............. 2-1 Table 2-2 : 9230A Model Series Specifications (Continued) ..........2-2 Table 3-1 : Cable Size Requirements ..................3-10 Table 4-1 : Test Points and Currents ..................4-5 Table 4-2 : Calibration Data Worksheet ..................
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Page 6: Introduction
This manual applies to all models of the 9230A Series of Precision DC Current Shunt Standards unless otherwise noted. This includes custom values that are ordered. The phone number in the USA and Canada to obtain Product Support, Calibration Service or Replacment Parts is (800) 310-8104. -
Page 7: To Obtain Warranty Or Calibration And Repair Service
Guildline Instruments will pay for all warranty costs including shipping to and from the original shipment point. However, if the instrument is purchased within one country and shipped to another, Guildline will only pay for shipping to and from the original ship to country or customer point. USA Warranty Return Address. -
Page 8: Safety Information
Section 1 For all other countries, including Canada please ship to: Guildline Instruments Limited 21 Gilroy Street, PO Box 99 Smiths Falls, ON K7A 4S9 Mark on the outside of the box: RMA # _____________ Model #_____________ Serial #_____________ The Statement: “Canadian manufactured goods being returned for repair.”... -
Page 9: 9230A Series Precision Dc Current Shunt Specifications
2.0 9230A SERIES PRECISION DC CURRENT SHUNT SPECIFICATIONS 2.1 9230A Model Series 12 Month Specifications Tables 2-1 and 2-2 show the specificatons for the 9230A series. For custom models, please consult your calibration certificate to determine uncertainties and maximum limits. Full Rated Current... -
Page 10: Table 2-2 : 9230A Model Series Specifications (Continued)
Section 2 Temperature Power Coefficient (± µΩ/Ω (ppm)) Size (W x L x H) Weight Model Coefficient 92310 MBIENT LOWING ± µΩ/Ω (ppm) inches PTION 9230A-10 114 x 356 x 85 4.5 x 14 x 3.4 9230A-15 114 x 356 x 85 4.5 x 14 x 3.4 9230A-15R 114 x 356 x 85... -
Page 11: Overview
3.0 OVERVIEW 3.1 General The Guildline Model 9230A series of four terminal DC current shunt standards are designed for precision measurement of direct current and for use as high accuracy low ohm value resistance standards. They are constructed from specially selected materials supported on an insulating base for mechanical stability and covered with a perforated metal cover to allow air cooling while providing physical protection for the resistive elements. -
Page 12: Measurement Ranges
3.3 Measurement Ranges Models in the 9230A series range in resistance values from 1 Ω to 5 µΩ with full scale current capabilities from 10 A to 5000 A respectively. Lead sets are available for all models that are designed to carry the maximum shunt current rating. -
Page 13: Design Configurations
Figure 3-1 illustrates an entire shunt assembly for the 10 A to 150 A full scale current ranges. Figure 3-1 : 9230A Series from 10 A to 150 A Full Scale Current TM9230A-C1-002 November, 2021... -
Page 14: 300 A To 500 A Standard Shunt Values
Figure 3-2 illustrates an entire shunt assembly for the 300 A to 500 A full scale current ranges. Figure 3-2 : 9230A Series from 300 A to 500 A TM9230A-C1-002 November, 2021 2 November, 2021... -
Page 15: 1000 A To 5000 A Standard Shunt Values
Figure 3-3 illustrates an entire shunt assembly for the 1000 A to 5000 A full scale current ranges. Figure 3-3 : 9230A Series from 1000 A to 5000 A TM9230A-C1-002 November, 2021... -
Page 16: Cable Connections
Section 3 3.5 Cable Connections The size and arrangement of the cables that connect the test current source to the shunt standard are of most importance to ensure the repeatablity of measurements and the overall quality of the measurements. 3.5.1 Test Current Cable Requirements In high current measurements, the cables that carry the test current will heat up due to the resistance of the cable itself. -
Page 17: Figure 3-4 : Single Cable Connection, 0 To 500 A
Section 3 Figure 3-4 : Single Cable Connection, 0 to 500 A Figure 3-5 : Two Cable Connection, 500 A to 1000 A TM9230A-C1-002 November, 2021 2 November, 2021... -
Page 18: Figure 3-6 : Four Cable Connection, 1000 A To 2000 A
Section 3 Figure 3-6 : Four Cable Connection, 1000 A to 2000 A Figure 3-7 : Six Cable Connection, 2000 A to 3000 A TM9230A-C1-002 November, 2021 2 November, 2021... -
Page 19: Figure 3-8 : Eight Cable Connection, 3000 A Too 4000 A
Section 3 Figure 3-8 : Eight Cable Connection, 3000 A too 4000 A TM9230A-C1-002 November, 2021 2 November, 2021... -
Page 20: Table 3-1 : Cable Size Requirements
Section 3 Test Current Range Number of Cables in Minimum Size Model Parallel (AWG) 0 to 10 9230A-10 0 to 15 9230A-15 0 to 15 9230A-15R 0 to 30 9230A-30 0 to 30 9230A-50 30 to 50 9230A-50 0 to 50 9230A-100 50 to 100 9230A-100... -
Page 21: Custom Values
Section 3 3.6 Custom Values Any custom value is available upon request. For custom values, to determine the uncertainy, use the closest nominal value listed in the specification table. Actual measurements and associated uncertainties will be listed on the calibration certificate and report of calibration. It is important to consider both the maximum test current requirement and the power dissipation that will be realized for a specific resistance value. -
Page 22: Calibration And Performance Verification
The listed points in Table 2 are for most values. 4.2 Calibration Overview This calibration procedure covers the entire range of the 9230A Series of Precision DC Current Shunt Standards. The 9230A calibration procedure typically requires only a 1 Ω resistance standard for the full range of measurement requirements. -
Page 23: Calibration Temperature Points
Smiths Falls Location. We can provide very good turn-around times with some of the lowest uncertainties available today. 9230A Users may find the use of Guildline Calibration Services an excellent convenience as well as a great alternative to maintaining their own calibration facilities to support these standards. -
Page 24: Routine Calibration
Guildline Instruments 6622A Series DCC Resistance Bridge Guildline Instruments 6675 or 6675A Series DCC Resistance Bridge Guildline Instruments Model 9975A (b) Guildline 6623A Series of Range Extenders from 3A through to 3000A in 150A increments 6623-100A Range Extender (c) Laboratory Grade Primary Resistance Standard (Acceptable Models) Guildline Instruments 6634A Temperature Stabilized Resistance Standard Guildline Instruments 9334A-1 Standard, 1 Ω... - Page 25 Section 4 Calibration Notes For All Models Always check availability of equipment and standards prior to starting the calibration If the required equipment is not available, do not proceed with the calibration. Ensure all equipment used is within the calibration validity interval. Before beginning the calibration, inspect the UUT for damage and cleanliness.
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Page 26: Table 4-1 : Test Points And Currents
Section 4 Currents for Natural Convection Currents for 92310 Forced Convection = √(P current ower esistance Model Value (Ω) 10 W Max A 10 W 25 W Max A 9230A-10 ≤10 9230A-15 9230A-15R 10.0 Rated only 25 W 9230A-30 10.0 10.0 15.8 9230A-50... -
Page 27: Calibration Procedure
Section 4 Calibration Procedure Record information as required into Table 3 (Calibration Data Worksheet) (a) Allow 9230A to stabilize for at least 24 hours at calibration temperature (including air or flowing oil baths). (b) Connect leads capable of handling the maximum required current from the 9230A Current Terminals to the range extender output current terminals. -
Page 28: Table 4-2 : Calibration Data Worksheet
Section 4 Model Value Serial Number ALIBRATION URRENT ALIBRATION Calibration Date ► Calibration Date ► Calibration Temp ► Calibration Temp ► Measurement Data Details Measurement Data Details Point 1 Point 2 Point 3 Point 1 Point 2 Point 3 ► ►... -
Page 29: Maintenance
Section 5 5.0 MAINTENANCE Maintenance of the 9230A series of shunt standards consists only of routinely inspecting the unit for physical damage and cleanliness. Cleanliness is especially important on the high value resistors (1 Megaohm and greater). These should be cleaned with isopropanol and a soft brush or cloth. -
Page 30: Models 9230A-10 To 9230A-150
Section 5 5.1.2 Models 9230A-10 to 9230A-150 Part Number (GPN#) Description 30559-01-17 Knob, ¼-20 30105-01-15 Perforated Cover for 9230A-10, -15 30114-01-15 Perforated Cover for 9230A-15R, -30, -50 30122-01-15 Perforated Cover for 9230A-100, -150 5.1.3 Models 9230A-300 and 9230A-500 Part Number (GPN#) Description 30559-02-17 Knob, 3/8-16... -
Page 31: High Current Cable Lead Sets
Section 5 5.1.6 High Current Cable Lead Sets Model Number Description 92301/92304 20A, 1 Meter/x Meter Lead set (Current and Sense Leads) 92318/92319 30A, 1.5 Meter/x Meter Lead set (Current and Sense Leads) 92302/92305 100A, 1 Meter/x Meter Lead set (Current and Sense Leads) 92321/92322 150A, 1.5 Meter/x Meter Lead set (Current and Sense Leads) 92303/92306...
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