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Vanguard Instruments TRM-40 User Manual

Transformer resistance meters
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TRANSFORMER RESISTANCE METERS
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
TRM-20 and TRM-40
USER'S MANUAL
November 2011
Revision 1.2

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  • Page 1 TRM-20 and TRM-40 TRANSFORMER RESISTANCE METERS USER’S MANUAL Vanguard Instruments Company, Inc. 1520 S. Hellman Ave. Ontario, California 91761, USA TEL: (909) 923-9390 November 2011 FAX: (909) 923-9391 Revision 1.2...
  • Page 2 TRM-20 AND TRM-40 USER’S MANUAL REV 1 SAFETY SUMMARY NOTICE This manual applies to both the TRM-20 and TRM-40 transformer resistance meters. The operating procedures are virtually the same for both models, and any differences are clearly described where applicable. FOLLOW EXACT OPERATING PROCEDURES Any deviation from the procedures described in this User’s Manual may create one or more...

  • Page 3: Table Of Contents

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL TABLE OF CONTENTS CONVENTIONS USED IN THIS DOCUMENT ..................1 INTRODUCTION ........................2 General Description and Features ................... 2 Technical Specifications ....................4 TRM Controls and Indicators ................... 5 PRE-TEST SETUP ........................6 Operating Voltages ......................
  • Page 4 TRM-20 AND TRM-40 USER’S MANUAL REV 1 LIST OF FIGURES Figure 1. TRM-20/40 Controls and Indicators ................5 Figure 2. Typical Connections to a Load Tap Changer (LTC) ............17 Figure 3. Typical TRM Connections Diagram for A Dynamic Resistance Test ......17 Figure 4.

  • Page 5: Conventions Used In This Document

    CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions: • Both the TRM-20 and TRM-40 are simply referred to as “TRM” in this manual. The exact model number is used only in cases where differences between the units are discussed.

  • Page 6: Introduction

    (primary and secondary windings of a transformer). Both the TRM-20 and TRM-40 can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply. The TRM-20 is capable of outputting a selectable test current from 1A to 20A while the TRM-40’s test current is selectable from 1A to 40A.
  • Page 7 REV 1 TRM-20 AND TRM-40 USER’S MANUAL User Interface The TRM features a back-lit graphic LCD screen (124x64) that is clearly viewable in both bright sunlight and low-light levels. An alpha-numeric keypad is used to enter test information and to operate the unit.

  • Page 8: Technical Specifications

    100-240 Vac, 50/60 Hz RESISTANCE READING 1 micro-ohm – 2000 Ohms (TRM-20); RANGE 1 micro-ohm to 500 Ohms (TRM-40) ACCURACY 1 – 19,999 micro-ohms: ±0.5% reading, ±1 count; 20 – 999 milliohms: ±1% reading, ±1 count; 1 -2000 Ohms: ±1.5% reading, ±1 count TEST CURRENT 1-20A in 1A increments (TRM-20);...

  • Page 9: Trm Controls And Indicators

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL TRM Controls and Indicators The TRM-20/40’s controls and indicators are shown in Figure 1. The purpose of the controls and indicators may seem obvious, but users should become familiar with them before using the TRM.

  • Page 10: Pre-Test Setup

    The TRM’s built-in thermal printer uses 2.5-inch wide thermal paper for printing test results. To maintain the highest print quality and to avoid paper jams, the use of thermal paper supplied by Vanguard Instruments Company is highly recommended. Additional paper can be ordered from the following sources: Vanguard Instruments Co, Inc.

  • Page 11: Replacing The Thermal Printer Paper

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL Replacing the Thermal Printer Paper The roll of thermal paper is housed inside a dispenser underneath the printer cover. To replace the paper, follow the steps below: • Unscrew the two large printer cover screws and remove the printer cover.

  • Page 12: Operating Procedures

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 OPERATING PROCEDURES Configuring the LTCA Software for use with the TRM The TRM can be used with a PC using the Vanguard LTCA software. Follow the steps below to properly connect the TRM and configure the LTCA application to recognize the unit.
  • Page 13 REV 1 TRM-20 AND TRM-40 USER’S MANUAL f. Launch the LTCA application and then click on the “Settings” icon. The following window will be displayed: Make sure the “User USB Port” is UN-checked. Then, from the “COM Port” drop-down menu, select the COM port that corresponds to the port that the TRM is connected to.

  • Page 14: Connecting The Trm To A Pc Via Bluetooth

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 Connecting the TRM to a PC via Bluetooth The TRM can also be connected wirelessly to a PC using Bluetooth. To connect the unit via Bluetooth, it must first be paired with the PC. Follow the steps below to pair the TRM to a PC...
  • Page 15 REV 1 TRM-20 AND TRM-40 USER’S MANUAL The TRM will be listed as “TRM S/N” where S/N is the device’s serial number. Click on the icon for the TRM and then click on the “Next” button. d. The following window will be displayed asking for a secret key to connect to the TRM: Type the word “default”...
  • Page 16 TRM-20 AND TRM-40 USER’S MANUAL REV 1 f. The following confirmation screen will be displayed: Click on the “Finish” button. g. The TRM-20 will now be displayed in the “My Bluetooth Places” window: Note the port number listed under the device name. In the above case, the port number...
  • Page 17 REV 1 TRM-20 AND TRM-40 USER’S MANUAL For Windows 7: a. Make sure the TRM is turned on. Then double click on the Bluetooth system tray icon (on the bottom right corner of your computer screen): b. The “Bluetooth Devices” window will be displayed:...
  • Page 18 TRM-20 AND TRM-40 USER’S MANUAL REV 1 c. All nearby Bluetooth devices will be listed: The TRM will be listed as “TRM S/N” where S/N is the device’s serial number. Click on the icon for the TRM and then click on the “Next” button.
  • Page 19 REV 1 TRM-20 AND TRM-40 USER’S MANUAL e. The following window will be displayed: Type the word “default” (without the quotes and in all lower-case) in the text box and click on the “Next” button. f. The following screen will be displayed:...
  • Page 20 TRM-20 AND TRM-40 USER’S MANUAL REV 1 g. The TRM will now be listed under “Bluetooth Devices”: Right click on the TRM-20 icon and select “Properties” from the pop-up menu. h. The properties window will be displayed. Click on the “Hardware” tab: Note the port number listed after the device name (COM23 in the above example).

  • Page 21: Typical Connections To A Load Tap Changer (Ltc)

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL Typical Connections to a Load Tap Changer (LTC) Figure 2. Typical Connections to a Load Tap Changer (LTC) Typical TRM-20/40 Cable Connections • Do not touch or disconnect any test lead that is connected to a transformer terminal while high current is being conducted during a test.

  • Page 22: Figure 4. Typical Trm Connections Diagram For 2 Windings

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 Figure 4. Typical TRM Connections Diagram for 2 Windings...

  • Page 23: General Procedures

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL General Procedures The main steps for using the TRM are outlined below: a. Ground the TRM to the substation ground. Always connect the TRM to the substation ground before connecting any test lead to any transformer bushing. Failure to follow this procedure may damage the TRM.

  • Page 24: Entering Test Record Header Information

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 Entering Test Record Header Information You can enter the test record header information before performing tests. The record header includes identifying information such as the company, station, circuit, model number, etc. Once the header information has been entered, it will apply to all subsequent test records. To enter the header information: a.
  • Page 25 REV 1 TRM-20 AND TRM-40 USER’S MANUAL d. The following screen will be displayed: STATION: ↑ ↓ TO POSITION "ENTER" TO ACCEPT [ENTER] Type the station name using the alpha-numeric keypad and then press the key. e. The following screen will be displayed: CIRCUIT: ↑...
  • Page 26 TRM-20 AND TRM-40 USER’S MANUAL REV 1 g. The following screen will be displayed: MODEL: ↑ ↓ TO POSITION "ENTER" TO ACCEPT Type the model information using the alpha-numeric keypad and then press the [ENTER] key. h. The following screen will be displayed: SERIAL NUMBER: ↑...
  • Page 27 REV 1 TRM-20 AND TRM-40 USER’S MANUAL j. The following screen will be displayed: OPERATOR: ↑ ↓ TO POSITION "ENTER" TO ACCEPT [ENTER] Type the operator’s name using the alpha-numeric keypad and then press the key. All header information will be saved, and you will be returned to the “START-UP” menu.

  • Page 28: Setting The Date And Time

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 Setting the Date and Time To set the date and time: a. Start from the “START-UP” menu: 11/01/11 1. RUN TEST 09:06:21 2. SETUP 22°C 72°F 3. USER DIAGNOSTICS Press the key (SETUP) b.

  • Page 29: Setting The Interface Language

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL Setting the Interface Language Follow the steps below to set the interface language (English, Spanish, or Turkish): a. Start from the “START-UP” menu: 11/01/11 1. RUN TEST 09:06:21 2. SETUP 22°C 72°F 3. USER DIAGNOSTICS Press the key (SETUP).

  • Page 30: Performing A Resistance Test

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 Performing a Resistance Test a. Start from the “START-UP” menu: 11/01/11 1. RUN TEST 09:06:21 2. SETUP 22°C 72°F 3. USER DIAGNOSTICS Press the key (RUN TEST). b. The following screen will be displayed: 1.
  • Page 31 REV 1 TRM-20 AND TRM-40 USER’S MANUAL e. The following menu will be displayed: SELECT TEST CURRENT: 1. 1A 2. 5A 3. 10A 4. 20A 5. 40A 6. CUSTOM Select the test current by pressing the corresponding numeric key on the keypad. Press key (CUSTOM) if you would like to enter a custom test current and then enter the current (between 1A-40A) on the next screen.
  • Page 32 TRM-20 AND TRM-40 USER’S MANUAL REV 1 ° 230.0 ↑↓ to adjust tk "ENTER" to accept [PAPER ∧ You can increase the Tk value by 0.5°C increments by pressing the Contrast] key. [PAPER ∨ You can decrease the Tk value by 0.5°C increments by pressing the Contrast] key.
  • Page 33 REV 1 TRM-20 AND TRM-40 USER’S MANUAL [ENTER] Press the key to confirm the reference temperature setting. The TRM will calculate the equivalent resistance value at this new temperature. NOTE i. The following warning screen will be displayed: ***** WARNING! *****...
  • Page 34 TRM-20 AND TRM-40 USER’S MANUAL REV 1 After the TRM finishes its internal calibration, the following screen will be displayed: *XFMR CHARGING* please wait... ** XFMR ENERGIZED! ** This is only an informational screen to remind the operator that a test is in progress. The display duration of this message depends on the size of the winding’s inductance.
  • Page 35 REV 1 TRM-20 AND TRM-40 USER’S MANUAL Once the data is saved, the following screen will be displayed: TEST IN PROGRESS > < TEST SAVED! 10.01 AMPS mΩ 1.465 mΩ 1.448 ** XFMR ENERGIZED! ** [STOP] Press the key to stop running the test. The test results will be displayed as...
  • Page 36 TRM-20 AND TRM-40 USER’S MANUAL REV 1 n. The following screen will be displayed: KEEP THIS READING? 1. YES 2. NO 1. YES Press the key (YES) to save the reading. One of the following screens will be displayed: The following screen will be displayed if there is no previous data in the memory: >...
  • Page 37 REV 1 TRM-20 AND TRM-40 USER’S MANUAL 2. NO If you do not wish to save the reading, press the key (NO) and continue to step o. o. The following screen will be displayed: RUN ANOTHER TEST? 1. YES 2. NO Press the key (YES) to run another test.

  • Page 38: Figure 5. Typical Resistance Test Results Printout

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 q. The following screen will be displayed: record number 01 has been saved! The record number is automatically assigned and incremented by the TRM. NOTE Press any key to return to the “START-UP” menu.

  • Page 39: Performing A Load Tap Changer / Voltage Regulator Resistance Test

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL 3.10 Performing a Load Tap Changer / Voltage Regulator Resistance Test The Load Tap Changer/Voltage Regulator Resistance Test can be used to conveniently measure the resistance at each tap position. Once the number of taps has been entered, the TRM will request the user to set the tap position, starting with the lower taps, then to neutral, and then to the raise taps.
  • Page 40 TRM-20 AND TRM-40 USER’S MANUAL REV 1 d. The following screen will be displayed ENTER NUMBER OF RAISE TAPS, NOT COUNTING NEUTRAL (1-23): Type the number of taps the LTC or Voltage Regulator has using the alpha-numeric [ENTER] keypad, and then press the key.
  • Page 41 REV 1 TRM-20 AND TRM-40 USER’S MANUAL g. The following screen will be displayed: SELECT TEST CURRENT: 1. 1A 2. 5A 3. 10A 4. 20A 5. 40A 6. CUSTOM Select the test current by pressing the corresponding numeric key on the keypad. Press key (CUSTOM) if you would like to enter a custom test current and then enter the current (between 1A-40A) on the next screen.
  • Page 42 TRM-20 AND TRM-40 USER’S MANUAL REV 1 ° 230.0 ↑↓ to adjust tk "ENTER" to accept [PAPER ∧ You can increase the Tk value by 0.5°C increments by pressing the Contrast] key. [PAPER ∨ You can decrease the Tk value by 0.5°C increments by pressing the Contrast] key.
  • Page 43 REV 1 TRM-20 AND TRM-40 USER’S MANUAL [ENTER] Press the key to confirm the reference temperature setting. The TRM will calculate the equivalent resistance value at this new temperature. NOTE k. The following screen will be displayed: ***** WARNING! *****...
  • Page 44 TRM-20 AND TRM-40 USER’S MANUAL REV 1 After the TRM finishes its internal calibration, the following screen will be displayed: *XFMR CHARGING* please wait... 1.01 AMPS ** XFMR ENERGIZED! ** n. The TRM determines when the resistance reading is stable and displays the resistance...
  • Page 45 REV 1 TRM-20 AND TRM-40 USER’S MANUAL p. After saving the readings, the following screen will be displayed: set tap to 2 lower ("START" to CONTINUE) ** XFMR ENERGIZED! ** Set the LTC or Voltage Regulator tap position to the position indicated on the LCD screen...
  • Page 46 TRM-20 AND TRM-40 USER’S MANUAL REV 1 record number 02 has been saved! Press any key to return to the “START-UP” menu. 2. NO If you do not wish to save the test record, press the key (NO). The following...

  • Page 47: Figure 6. Typical Ltc/Voltage Regulator Test Report Printout

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL Figure 6. Typical LTC/Voltage Regulator Test Report Printout...

  • Page 48: Performing A Special Resistance Test

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.11 Performing a Special Resistance Test The Special Resistance Test is used to conduct a resistance test for a pre-defined period ranging from 1 to 45 minutes. The resistance data is recorded at one minute intervals. Use the steps below to perform a Special Resistance Test: a.
  • Page 49 REV 1 TRM-20 AND TRM-40 USER’S MANUAL d. The following screen will be displayed: enter special test time minutes (1-45) Enter the test time (between 1 to 45 minutes) using the alpha-numeric keypad, and [ENTER] then press the key. e. The following screen will be displayed: SELECT TEST CURRENT: 1.
  • Page 50 TRM-20 AND TRM-40 USER’S MANUAL REV 1 Press the key (COPPER, Tk=234.5) to select copper as the winding material. Continue to step g. Press the key (ALUMINUM, Tk=225) to select aluminum as the winding material. Continue to step g. Press the key (MANUALLY ENTER Tk) to manually enter the Tk value.
  • Page 51 REV 1 TRM-20 AND TRM-40 USER’S MANUAL h. The following screen will be displayed: REFERENCE TEMP: ° ° 75.0 167.0 ↑↓ to adjust tk "ENTER" to accept [PAPER ∧ Contrast] [PAPER ∨ Contrast] Use the keys to adjust the reference temperature.
  • Page 52 TRM-20 AND TRM-40 USER’S MANUAL REV 1 k. The following screen will be displayed momentarily: calibrating please wait... After the TRM finishes its internal calibration, the following screen will be displayed: *XFMR CHARGING* please wait... 1.01 AMPS ** XFMR ENERGIZED! ** This is only an informational screen to remind the operator that a test is in progress.
  • Page 53 REV 1 TRM-20 AND TRM-40 USER’S MANUAL m. The following screen will be displayed: SAVE THIS RECORD? 1. YES 2. NO 1. YES Press the key (YES) to save the test record. Continue to step m. 2. NO Press the key (NO) if you do not want to save the test record.

  • Page 54: Figure 7. Typical Special Test Report Printout

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 Figure 7. Typical Special Test Report Printout...

  • Page 55: Performing A Dynamic Ltc Test

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL 3.12 Performing a Dynamic LTC Test The Dynamic LTC Test is used to conduct a resistance test while the LTC or Voltage Regulator is switching taps. The test will run for 240 seconds to allow the LTC or Voltage Regulator enough time to switch through all of the taps during the test.
  • Page 56 TRM-20 AND TRM-40 USER’S MANUAL REV 1 d. The following screen will be displayed: SET LTC/VREG To LOWEST TAP POSITION. PRESS ANY KEY WHEN READY Set the LTC or Voltage Regulator to the lowest position either manually or by pressing...
  • Page 57 REV 1 TRM-20 AND TRM-40 USER’S MANUAL READY TO CAPTURE DATA PRESS "ENTER" - OR - LTC RAISE/LOWER TO START TIMING... [ENTER] [RAISE] [LOWER] Press the key or the LTC key to continue. g. The TRM will start capturing data and the following screen will be displayed:...
  • Page 58 TRM-20 AND TRM-40 USER’S MANUAL REV 1 1. YES Press the key (YES) to save the test results to the connected USB Flash drive. The following screen will be displayed: REC_001 SAVED TO THUMB DRIVE. Press any key to return to the “START-UP” menu.

  • Page 59: Figure 8. Typical Dynamic Ltc Test Results Printout Showing An Opened Circuit

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL Figure 8. Typical Dynamic LTC Test Results Printout Showing an Opened Circuit...

  • Page 60: Performing A Diagnostic Test

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.13 Performing a Diagnostic Test In diagnostic mode, the TRM can run a resistance test, display the sense voltages, and test current on the TRM. This feature can be used to verify the TRM’s voltage and current readings against an external meter.
  • Page 61 REV 1 TRM-20 AND TRM-40 USER’S MANUAL d. The following screen will be displayed: - USER DIAG TEST - "START" TO RUN TEST "STOP" TO ABORT [START] Press the key. e. The V1, V2, and test current (I) will be displayed as shown below: USER DIAGNOSTICS V1 = 35.86...

  • Page 62: Demagnetizing The Transformer Core

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.14 Demagnetizing the Transformer Core You can demagnetize the transformer core using the steps below: a. Start from the “Start-Up” menu: 11/07/11 1. RUN TEST 08:49:15 2. SETUP 22°C 72°F 3. USER DIAGNOSTICS...
  • Page 63 REV 1 TRM-20 AND TRM-40 USER’S MANUAL e. The degaussing process will start and updates will be displayed on the screen as shown below: * DEGAUSSING XFMR * -> SETTING CORE... ** XFMR ENERGIZED! ** * DEGAUSSING XFMR * SETTING CORE...

  • Page 64: Working With Test Records

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.15 Working with Test Records 3.15.1. Viewing the Contents of the Working Memory Whenever a test is performed and the reading is kept, the data is temporarily stored in the TRM’s working memory. You can view the test reading in the unit’s working memory using the steps below: a.
  • Page 65 REV 1 TRM-20 AND TRM-40 USER’S MANUAL 2. PRINT TO PRINTER Press the key (PRINT TO PRINTER) to print the test record on the unit’s thermal printer. You will then be returned to the “START-UP” menu.

  • Page 66: Saving Test Results To A Test Record

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.15.2. Saving Test Results to a Test Record After performing a test, the user is presented the option to save the test results to the unit’s Flash EEPROM or to a USB Flash Drive. If the test results are not saved immediately after performing a test, they will still remain in the working memory and can be saved later, as long as a new test has not been performed and the unit has not been turned off.
  • Page 67 REV 1 TRM-20 AND TRM-40 USER’S MANUAL If a USB Flash drive is connected to the unit, continue to step d. If a USB Flash drive is NOT connected to the unit, continue to step e. d. The following screen will be displayed: 1.

  • Page 68: Restoring A Test Record From Flash Eeprom

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.15.3. Restoring a Test Record From Flash EEPROM Use the steps below to restore a test record from the TRM’s internal Flash EEPROM to the working memory: a. Start from the “START-UP” menu: 11/09/11 1.
  • Page 69 REV 1 TRM-20 AND TRM-40 USER’S MANUAL d. The following screen will be displayed: RESTORE RECORD 1. ENTER RECORD NUMBER 2. SCROLL TO SELECT If you have a USB Flash drive inserted in the unit’s “USB MEM” port, the following screen will be displayed instead of the above screen: NOTE 1.
  • Page 70 TRM-20 AND TRM-40 USER’S MANUAL REV 1 RECORD RESTORED! PRINT RECORD? 1.YES 2.NO Press the key (YES) if you would like to print the restored test record on the unit’s built-in thermal printer. You will be returned to the “START-UP” menu after printing is finished.
  • Page 71 REV 1 TRM-20 AND TRM-40 USER’S MANUAL RECORD RESTORED! PRINT RECORD? 1.YES 2.NO Press the key (YES) if you would like to print the restored test record on the unit’s built-in thermal printer. You will be returned to the “START-UP” menu after printing is finished.

  • Page 72: Restoring A Test Record From A Usb Flash Drive

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.15.4. Restoring a Test Record From a USB Flash Drive Use the steps below to restore a test record from a USB Flash drive to the TRM’s working memory: a. Make sure the USB Flash drive containing the test record(s) is inserted in the TRM’s USB Flash drive port (“USB MEM”...
  • Page 73 REV 1 TRM-20 AND TRM-40 USER’S MANUAL d. The following screen will be displayed: 1. INTERNAL STORAGE 2. THUMB DRIVE Press the key (THUMB DRIVE). e. The following screen will be displayed: RESTORE THUMB DRIVE REC_ Type the record number that you would like to restore using the alpha-numeric keypad...

  • Page 74: Copying Test Records To A Usb Flash Drive

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.15.5. Copying Test Records to a USB Flash Drive Use the steps below to copy one or all test records from the unit’s Flash EEPROM to a connected USB Flash drive: a. Make sure a USB Flash drive is connected to the unit’s “USB MEM” port, and then start from the “START-UP”...
  • Page 75 REV 1 TRM-20 AND TRM-40 USER’S MANUAL d. The following screen will be displayed: COPY REC TO THUMB DRV 1.COPY SINGLE RECORD 2.COPY ALL RECORDS 1. COPY SINGLE RECORD Press the key (COPY SINGLE RECORD) to copy a single test record from the unit’s Flash EEPROM to the connected USB Flash drive.
  • Page 76 TRM-20 AND TRM-40 USER’S MANUAL REV 1 2. COPY ALL RECORDS Press the key (COPY ALL RECORDS) to copy all test records from the TRM’s Flash EEPROM to the connected USB Flash drive. All test records will be copied from the unit to the connected USB Flash drive. The following screen will be...

  • Page 77: Printing A Test Record Directory

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL 3.15.6. Printing a Test Record Directory Use the steps below to print a directory of the test records stored in the TRM’s Flash EEPROM: a. Start from the “START-UP” menu: 11/10/11 1. RUN TEST 12:13:15 2.

  • Page 78: Figure 9. Typical Test Record Directory Printout

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 d. The following screen will be displayed: PRINT DIRECTORY 1. FULL DIRECTORY 2. SHORT DIRECTORY Press the key (FULL DIRECTORY) to print the entire directory of test records. After the directory is printed, you will be returned to the “START-UP” menu.

  • Page 79: Erasing Test Records From The Flash Eeprom

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL 3.15.7. Erasing Test Records from the Flash EEPROM Follow the steps below to erase test records from the unit’s Flash EEPROM: a. Start from the “START-UP” menu: 11/10/11 1. RUN TEST 12:13:15 2. SETUP 22°C...
  • Page 80 TRM-20 AND TRM-40 USER’S MANUAL REV 1 d. The following screen will be displayed: ERASE RECORD 1. ERASE SINGLE REC. 2. ERASE ALL RECORDS "STOP" TO EXIT If you have a USB Flash drive inserted in the unit’s “USB MEM” port, the...
  • Page 81 REV 1 TRM-20 AND TRM-40 USER’S MANUAL RECORD NUMBER 21 ERASED! Press any key to return to the “START-UP” menu. 2. ERASE ALL RECORDS Press the key (ERASE ALL RECORDS) to erase all records stored in the TRM’s Flash EEPROM. The following screen will be displayed:...

  • Page 82: Erasing Test Records From A Usb Flash Drive

    TRM-20 AND TRM-40 USER’S MANUAL REV 1 3.16 Erasing Test Records from a USB Flash Drive Follow the steps below to erase test records from a USB Flash drive: a. Make sure a USB Flash drive is connected to the unit’s “USB MEM” port, and then start from the “START-UP”...
  • Page 83 REV 1 TRM-20 AND TRM-40 USER’S MANUAL e. The following screen will be displayed: ERASE RECORD 1. ERASE SINGLE REC. 2. ERASE ALL RECORDS "STOP" TO EXIT 1. ERASE SINGLE REC. Press the key (ERASE SINGLE REC.) to erase a single test record from the connected USB Flash drive.
  • Page 84 TRM-20 AND TRM-40 USER’S MANUAL REV 1 [STOP] Press the key if you do not want to erase all the test records. You will be returned to the “START-UP” menu. [ENTER] Press the key to proceed with deleting all the test records from the connected USB Flash drive.

  • Page 85: Converting Resistance Measurements

    REV 1 TRM-20 AND TRM-40 USER’S MANUAL 3.17 Converting Resistance Measurements The TRM can convert the resistance reading of the device under test at its present temperature to the equivalent resistance value at a different temperature. The conversion is accomplished...
  • Page 86 1520 S. Hellman Ave • Ontario, CA 91761 • USA Phone: 909-923-9390 • Fax: 909-923-9391 www.vanguard-instruments.com Copyright © 2011 by Vanguard Instruments Company, Inc. TRM-20/40 User’s Manual • Revision 1.2 • August 22, 2012 • TA...

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