IDEAL INDUSTRIES, INC. TECHNICAL MANUAL MODEL: 61-920 The Service Information provides the following information: • Precautions and safety information • Specifications • Performance test procedure • Calibration and calibration adjustment procedure • Basic maintenance (Disassembly, Troubleshooting, Spare Parts list) Form number: TM61920 Revision: 4.
TABLE OF CONTENTS Page Title Introduction Precautions and Symbol Information 1 1 Safety Information 2 Specifications 3 General Specification 3 Ground Resistance Specifications 4 Ground & Leakage Current Specifications 4 Performance Verification 5 Calibration 6 Preparation 6 Procedure 7-9 Disassembly and Component Layout 9 Troubleshooting 10-12 Spare Parts List 12 Form number TM61920 Rev 4 July 2008
Page 1 Introduction Warning To avoid shock or injury, do not perform the verification tests or calibration procedures described in this manual unless you are qualified to do so. The information provided in this document is for the use of qualified personnel only. Caution The 61-920 Ground Clamp contains parts that can be damaged by static discharge. Follow the standard practices for handling static sensitive devices. For additional information about IDEAL INDUSTRIES, INC.
Page 2 SAFETY Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use the product only as specified. CAUTION. These statements identify conditions or practices that could result in damage to the equipment or other property. WARNING. These statements identify conditions or practices that could result in personal injury or loss of life. Specific precautions Use proper Fuse.
Page 3 General specifications Characteristics Display Conductor Size Overrange Indication Sampling Rate Operating Environment: Relative Humidity Storage Environment: Power source: Measurement time: Low Battery Indicator: Auto power off Power Consumption Operating system Response Time Location for use IP protection degree Electrostatic discharge immunity Withstand Voltage Insulation Resistance Applicable standards Dimensions Weight: Form number TM61920 Description LCD with a maximum count of 2099 Approxima
Page 4 RANGES and ACCURACY SPECIFICATION Measurement Characteristics (All at 75°F ± 5°C, < 85% R.H.) Ground Resistance Range 20Ω 200Ω Measuring Range Resolution 0.00Ω - 20.99Ω 0.01 Ω 16.0Ω - 99.9Ω 0.1Ω 100.0Ω - 209.9Ω 0.1Ω 160Ω - 399Ω 1Ω 1200Ω 400Ω - 599Ω 1Ω 600Ω - 1260Ω 10Ω Continuity Measurement: Beep if resistance < 10.00 Ω (approximately) Ground/Leakage Current Range 100mA 1000mA 10A 30A Measuring Range 0.0 - 104.9mA 80 - 1049mA 0.80 - 10.49A 8.0 - 31.5A Resolution .1mA 1mA .01A .1A Accuracy ± 1.
Page 5 PERFORMANCE VERIFICATIONS Perform the following analysis, if the meter conforms to the limits listed in Table 1 the meter is functioning correctly. If the meter does not conform to any of the listed limits the calibration procedure must be performed. Performance Verification Preparation • • • Turn on the calibrator, allow calibrator to warm up. Temperature stabilization should be reached after 30 minutes. Remove battery cover and use a calibrated meter to ensure the battery measures a minimum of 4.
Page 6 CALIBRATION (1) Calibration Preparation (1.1) This procedure consists of the following sections. (1) Calibration Preparation (2-6) Adjustments (7) Disassembly and Component Layout (8) Trouble-shooting (9) List of spare parts (1.2) Adjustment procedure will require the following tools and fixed standards Prepare following items for adjustment. Oscilloscope, 20 MHz or better. See Figure 1 General resistors @ .5% or better (0.
Page 7 (2) Calibration Procedure It is recommended that all IDEAL meters undergo the following calibration procedure on an annual basis. (2.1) Press the POWER button, without clamping anything, while the CAL button is being pressed down. Then release the POWER button. Version information (3-digit) about this instrument is displayed in a short minute. Then the instrument goes into Ω adjustment mode. (2.
Page 8 (3.5) Repeatability check with 1000Ω and re-adjustment Press the ▲ button twice. Then “F.S” is displayed at the upper position of the LCD. Use 1000Ω resistor. Open and close the jaws, and check the readings on the LCD. Repeat this kind of work five times. Each time the reading should be within 900 ~ 1100. If the reading is within above range, proceed to the next process. If one of the readings is out of above range, repeat the adjustment from 2.-(4) Full scale adjustment (Hi range).
Page 9 (5.3) Adjust the current range (cont’d.) (d). 30.0A adjustment Press the MEM/MODE button once. Generation current: 30A@50Hz Press the MEM/WRITE button after the reading becomes stable. (saving the adjustment value) (6) Press the POWER button to power off the unit and replace the front decal, making sure the plastic switch extensions are in place. (7) Disassembly Removal of battery cover Loosen one battery cover-fixing screw, and remove the battery cover. (7.
Page 10 (8). Trouble shooting Symptoms The instrument cannot be buttoned on. Possible Causes No batteries. Remedies Set the batteries. Faulty battery polarity Insufficient capacity of battery Install batteries in correct polarity. Replace the batteries. Poor contact of battery contacts Replace the battery contacts. A break in a battery harness Make a continuity test of test lead. If there is no continuity, replace the battery harness.
Page 11 (8). Trouble shooting (cont’d.) Symptoms Possible Causes When measuring Insufficient capacity of battery resistance, error of measurement is Bad fit of Jaw. notable. Re-adjustment of PCB Defect of circuit component When measuring AC current, error of measurement is notable. Insufficient capacity of battery Bad fit of jaw. Re-adjustment of PCB Defect of circuit component Any button doesn’t work. Button spacer is missing. Defect of circuit component Buzzer doesn’t sound.
Page 12 (8). Trouble shooting (cont’d.) Switch spacer for MEM WRITE Incapable of saving data. button is missing. Defect of circuit component Switch spacer for backlight is missing. Backlight doesn’t light up. Poor contact of backlight Defect of circuit component Put the Button spacer at the specific location. Check above points first. If there is no problem, replace the PCB, and do re-adjustment. Put the button spacer at the specific location. Soldered point at backlight should be checked.
POWER SW CAL SW Fig.
