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ED&D LT-952HC User Manual

Leakage current tester
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PRODUCT SAFETY SOLUTIONS
USER'S MANUAL
LEAKAGE CURRENT TESTER
LT-952HC
MODEL

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Summary of Contents for ED&D LT-952HC

  • Page 1 PRODUCT SAFETY SOLUTIONS USER’S MANUAL LEAKAGE CURRENT TESTER LT-952HC MODEL...

  • Page 2: Table Of Contents

    PRODUCT SAFETY SOLUTIONS Model LT-952HC MANUAL INDEX Table of Contents INTRODUCTION: ............................2 Warnings: ..............................2 Product purpose: ............................2 Understanding Leakage Current ........................ 3 Before using: ............................. 5 PRODUCT COMPONENTS: ......................... 6 PRODUCT SPECIFICATIONS: ........................10 OPERATING INSTRUCTIONS: ........................11 THEORY OF OPERATION: ........................

  • Page 3: Introduction

    IMPORTANT INSTRUCTIONS - RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE INTRODUCTION: Thank you for choosing the ED&D LT-952HC. With proper use and care it will give many years of accurate and reliable service. Upon receiving the unit please check for obvious physical damage to the packaging material and the instrument itself.

  • Page 4: Understanding Leakage Current

    The LT-952HC is designed to test any single-phase product rated 100-120 or 200-240 Volts that requires 30 Amps or less current.
  • Page 5 PRODUCT SAFETY SOLUTIONS B. How Is Leakage Current Measured? To measure leakage current, the scenario described above must be simulated. The worst case exists when the human body is the sole path for the leakage current. Therefore, when conducting this test the product is energized with the grounding conductor disconnected, and all other possible ground paths isolated.

  • Page 6: Before Using

    Before using: Read the entire manual before attempting to use the Leakage Tester. • Operation and use of the LT-952HC is to be performed by Qualified Personnel ONLY. • WARNING: Person(s) using this device should have proper education/training in its use.

  • Page 7: Product Components

    PRODUCT SAFETY SOLUTIONS PRODUCT COMPONENTS: I. Figure 1 - Front Panel A. Neutral Open / Closed Switch B. Line Forward / Reverse Switch C. Ground Open / Closed Switch D. LCD Display E. Power On / Off Switch F. D.U.T. (Device Under Test) Receptacle G.
  • Page 8 ON, the meter display should be visible and the green Ground Closed lamp should be lit. For safety, the LT-952HC is designed to disable both the front and rear panel outlets when the power switch is OFF.
  • Page 9 Line and the LT-952HC is set for 115 Volt operation. Hazardous Voltage also exits at the banana jacks when the Meter Reference Switch is set to Line or Neutral and the LT-952HC is set for 230 Volt operation. II. Figure 2 – Rear Panel A.
  • Page 10 D. METER FUSE – The meter fuse is designed to protect the LT-952HC’s sensitive meter measurement circuit from damage in cases of overload. E. LINE FUSE – The line fuse protects the LT-952HC from power surges and from inadvertent connection to a 240 Volt source when the Voltage Selector Switch is set to 115 Volts.

  • Page 11: Product Specifications

    From an exposed surface to the meter reference point Between two exposed surfaces Frequency Response of the Meter: The LT-952HC measures cumulative leakage current from all frequencies up to and including 1MHz. Page 10 of 19 © 2017 Educated Design & Development, Inc. All rights reserved. Rev C...

  • Page 12: Operating Instructions

    5. Connect the product under test to the front panel receptacle. Make sure that the product under test’s power switch is ON. 6. Turn the Power switch of the LT-952HC to ON. Observe that the leakage indicated on the LT-952HC is ZERO. This is normal as the leakage current is flowing through the still connected product ground.
  • Page 13 ZERO. This is normal as the leakage current is flowing through the still connected product ground. 7. Connect a test lead from the right front panel banana jack on the LT-952HC to the surface to be tested on the product.
  • Page 14 5. Connect the product under test to the front panel receptacle. Make sure that the product under test’s power switch is ON. 6. Connect the test leads from the front panel banana jacks on the LT-952HC to the two surfaces to be tested on the product.

  • Page 15: Theory Of Operation

    THAT CAN CAUSE THE METER FUSE TO BLOW. THEORY OF OPERATION: This section of the manual contains a description of the circuitry used in the LT-952HC. During this discussion, please refer to the Block Diagram located following this section. The LT-952HC is composed of 3 major sections. The first is the high current handling switching section.
  • Page 16 A power relay, a DPST type, is used to disconnect the front panel 120 Volt outlet when the rear panel Voltage selector is set to 230 Volt operation. If 230 Volts is inadvertently applied to the LT-952HC while the Voltage selector is set to 115, the line fuse is designed to open which will cause the relay contacts to open.
  • Page 17 Problem The meter display is blank and the Ground Closed indicator does not light when the LT- 952HC is turned on. Solution: Check to make sure that the LT-952HC is receiving power and that the Voltage Selector switch is in the proper position. Check the Line Fuse on the LT-952HC.

  • Page 18: Reference Standards

    TROUBLESHOOTING: (continued) designed to blow if the LT-952HC is connected to 230 Volts and the Voltage Selector switch is set to 115. If the Voltage Selector switch is set to the proper position and the fuse still blows, then the LT-952HC has been damaged and should be returned to E.D.&D.

  • Page 19: Calibration

    The recommended calibration intervals are as follows: 6 Months - If the LT-952HC is being used in an environment where it is subject to vibration and frequent changes in temperature (i.e. Field Testing). 12 Months - If the LT-952HC is being used in a laboratory or production setting with a controlled environment.

  • Page 20: Limited Warranty

    Educated Design & Development, Inc. (“ED&D”) hereby warrants to the original purchaser of any new ED&D Model LT-952HC Leakage Current Tester that the device shall be free from defect in material and/or workmanship. This warranty shall extend for a period of 1 year (365 days) from the date of purchase.

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