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Summary of Contents for Tegam SR1050
- Page 1 MODEL SR1050 RESISTANCE TRANSFER STANDARD Instruction Manual PN# 6853 Publication Date: SEPTEMBER 2004 REV. B...
- Page 3 NOTE: This user’s manual was as current as possible when this product was manufactured. However, products are constantly being updated and improved. Because of this, some differences may occur between the descriptions in this manual and the product received. Please refer to www.tegam.com for future updates of this manual. SR1050 Instruction Manual...
- Page 4 Lucas Weinschel, and Pragmatic Instruments. A complete list can be viewed on our Product Service Directory at www.tegam.com For more information about TEGAM and our products, please visit our website at www.tegam.com: or contact one of our customer service representatives at sales@tegam.com...
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Page 5: Table Of Contents
Figure 3-4 Leakage Resistances with Series Resistors ......3-4 3.3 Constant Leakage ................3-5 Figure 3-5 Constant Leakage Construction ........... 3-5 Figure 3-6 Model SR1050 Schematic ........... 3-6 3.4 Basic Transfer Accuracy ..............3-7 3.5 Linearity Deviation ................3-8 CALIBRATION 4.1 General ................... - Page 6 Expedite Repair & Calibration Form ............6-4 APPENDIX…………………… ..................A1 SR1050 Instruction Manual...
- Page 7 INTRODUCTION INTRODUCTION OPERATING INSTRUCTIONS THEORY REPLACEMENT PARTS SERVICE INFORMATION APPENDIX SR1050 Instruction Manual...
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Page 8: Introduction
There are no solid insulation leakage paths to ground other than at the terminal points, regardless of the configuration into which the individual resistance steps may be switched. A unique and outstanding design characteristic of the TEGAM SR 1050 Resistance Transfer Standard obviates the need to support resistors from a common insulating sheet or from insulators mounted on a common conducting surface. -
Page 9: Specifications
INTRODUCTION SR1050 Instruction Manual 1.2 SPECIFICATIONS Resistance Values: 1 megohm and 10 megohms per step. Transfer Accuracy: Limited only by short-term repeatability of resistance values. Typical repeatability ±2 ppm. Calibration Accuracy: 10 ppm for 1 megohm and 15 ppm for 10 megohm steps. -
Page 11: Operating Instructions
OPERATING INSTRUCTIONS INTRODUCTION OPERATING INSTRUCTIONS THEORY REPLACEMENT PARTS SERVICE INFORMATION APPENDIX SR1050 Instruction Manual... -
Page 12: Using The Calibration Chart
SR1050 Instruction Manual 2.1 Using the Calibration Chart The calibration chart on the end of the enclosure for each SR1050 gives resistance calibration data for individual resistors and groups of resistors in the SR1050, in terms of their deviation from nominal value, expressed in parts per million. -
Page 13: High Accuracy Calibration Transfer
OPERATING INSTRUCTINS SR1050 Instruction Manual HIGH-ACCURACY CALIBRATION TRANSFER It is desirable to have as few standards that must be calibrated by national laboratories as possible. The best plan in the case of resistance is to have 1 ohm or 10 kilohm standard resistors for reference standards. One can then compare by ratio techniques the transfer standards to the reference standards. - Page 14 OPERATING INSTRUCTIONS SR1050 Instruction Manual Figure 2-3 Switch Positions for Ten Times Nominal Step Resistance Figure 2-4 Switch Positions for Series-Parallel Connection Equal to Nominal Value of One Step...
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Page 15: Voltage Divider Operation
SR1050 Instruction Manual VOLTAGE DIVIDER OPERATION The Model SR1050 Transfer Standard may be used as a voltage divider. A coaxial fitting, nominally capped, connects to one end of the resistor string, and may be used as either the high or low voltage end of the divider. If it is so used, one of the other terminals, A or B, forms the opposite end of the divider and the remaining terminal is the tap. -
Page 17: Theory
THEORY INTRODUCTION OPERATING INSTRUCTIONS THEORY CALIBRATION REPLACEMENT PARTS SERVICE INFORMATION APPENDIX SR1050 Instruction Manual... -
Page 18: Three-Terminal Resistance Measurements Of Single Resistors
THEORY SR1050 Instruction Manual 3.1 THREE-TERMINAL RESISTANCE MEASUREMENTS OF SINGLE RESISTORS When a resistor is mounted between two terminals on a terminal board made of insulating material, the leakage resistance of the board shunts the resistor. However, when the resistor is mounted between insulators on a metal terminal board (Figure 3-1), the leakage is all to the metal board. - Page 19 THEORY SR1050 Instruction Manual resistor can be measured to high accuracy even though its resistance and the leakage resistances are of the same order of magnitude (as might be true on a humid day). Figure 3-3 shows the method of making three-terminal connections when using the Kelvin bridge circuit.
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Page 20: Three-Terminal Resistance Measurements Of Series And Parallel Groups Of Resistors
THEORY SR1050 Instruction Manual 3.2 THREE-TERMINAL RESISTANCE MEASUREMENTS OF SERIES AND PARALLEL PARALLEL GROUPS OF RESISTORS When resistors are connected in parallel, the shunting resistance of the insulators holding each resistor is the same value as the resistance shunting each resistor when it is measured individually. Thus the parallel value of the resistors is precisely related to the individual values of the resistors. -
Page 21: Constant Leakage
SR1050 Instruction Manual 3.3 CONSTANT LEAKAGE Such errors are eliminated in the Model SR1050 Transfer Standard by special construction. Controlled leakage construction is illustrated in Figure 3-5. The leakage resistance of the insulator that supports each resistor is shunted across each resistor. - Page 22 THEORY SR1050 Instruction Manual Figure 3-6 illustrates schematically the Model SR1050 Transfer Standard. Figure 3-6 Model SR1050 Schematic...
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Page 23: Basic Transfer Accuracy
THEORY SR1050 Instruction Manual 3.4 BASIC TRANSFER ACCURACY... -
Page 24: Linearity Deviation
THEORY SR1050 Instruction Manual 3.5 LINEARITY DEVIATION... - Page 25 THEORY SR1050 Instruction Manual...
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Page 27: Calibration
CALIBRATION INTRODUCTION OPERATING INSTRUCTIONS THEORY CALIBRATION REPLACEMENT PARTS SERVICE INFORMATION APPENDIX SR1050 Instruction Manual... -
Page 28: General
The four steps involved in making such traceable measurements are: (1) traceable calibration of a resistance standard, (2) measurement of the first ten resistors of the Model SR1050 Transfer Standard connected in parallel to determine the cumulative deviation, (3) -
Page 29: First Ten Resistor Measurement
FIRST TEN RESISTOR MEASUREMENT 1. Connect the 100 kilohm-per-step transfer standard for a resistance of one-tenth of the resistance of a step of the Model SR1050 to be calibrated. If the Model SR1050 to be calibrated is 1-megohm-per-step, connect the first nine resistors of the 100 kilohm-per-step transfer standard in series parallel for a total resistance of 100 kilohms. -
Page 30: Computation Of Deviations
3. Note the deviation of each resistor. 4. After measuring each resistor, recheck the deviation of the first resistor; the deviation should be 0 ppm. COMPUTATION OF DEVIATIONS 1. Compute the cumulative deviations of the resistors: a. For each resistor, starting with resistor 1, sum the deviations of that resistor and all preceding resistors. -
Page 31: Replacement Parts
REPLACEMENT PARTS INTRODUCTION OPERATING INSTRUCTIONS THEORY CALIBRATION REPLACEMENT PARTS SERVICE INFORMATION APPENDIX SR1050 Instruction Manual... - Page 32 REPLACEMENT PARTS SR1050 Instruction Manual The following parts are listed alphabetically by description. All parts are available from TEGAM Incorporated. TEGAM Incorporated’s Cage Code number is 49374. When ordering parts, please include the following information: Model and Serial number of the instrument...
- Page 33 Service Information INTRODUCTION OPERATING INSTRUCTIONS THEORY CALIBRATION SERVICE INFORMATION APPENDIX SR1050 Instruction Manual...
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Page 34: Warranty
TEGAM service center with shipping charges prepaid. TEGAM Inc. shall pay for the return of the product to the customer if the shipment is to a location within the country in which the TEGAM service center is located. The customer shall be responsible for paying all shipping, duties, taxes, and additional costs if the product is transported to any other locations. - Page 35 SR1050 Instruction Manual Preparation for Repair or Calibration Service: Once you have verified that the cause for SR1050 malfunction cannot be solved in the field and the need for repair and calibration service arises, contact TEGAM customer service to obtain an RMA, (Returned Material Authorization), number.
- Page 36 Service Information SR1050 Instruction Manual Expedite Repair & Calibration Form Use this form to provide additional repair information and service instructions. The completion of this form and including it with your instrument will expedite the processing and repair process. RMA#:...
- Page 37 Appendix INTRODUCTION OPERATING INSTRUCTIONS THEORY CALIBRATION REPLACEMENT PARTS SERVICE INFORMATION APPENDIX...
- Page 38 Appendix SR1050 Instruction Manual There is no information contained in the Appendix at this time.
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