Related Manuals for IDEAL 61-920
Summary of Contents for IDEAL 61-920
- Page 1 99 Washington Street #61-920 Melrose, MA 02176 Fax 781-665-0780 TestEquipmentDepot.com Ground Clamp Resistance Meter Instruction Manual...
-
Page 2: Table Of Contents
Contents 1. Safety warnings ......................1 2. Features ........................3 3. Specifications......................4 4. Instrument layout......................6 5. Measurement theory....................7 6. Preparation for measurement ..................9 7. Measuring procedure ....................10 7-1 Normal measurement of current ................11 7-2 Measurement of balance leakage current............11 7-3 Measurement of earth resistance...............12 8. -
Page 3: Safety Warnings
1. Safety Warnings This instrument has been designed, manufactured and tested according to IEC61010 Safety Requirements for electronic measuring apparatus, and calibrated in accordance with practices using equipment that is cal- ibrated to standards traceable to the National Institute for Standards and Technology (NIST). This instruction manual contains warnings and safety procedures which must be observed to ensure safe operation of the instrument and maintain it in a safe condition. - Page 4 • Do not use the instrument if any abnormal conditions, such as a broken cover or exposed metal parts are present on the instrument. • Do not install substitute parts or make any modification to the instrument. Return the instrument to: IDEAL INDUSTRIES, INC. Attn: Repair Department 1000 Park Avenue Sycamore, IL 60178 •...
-
Page 5: Features
2. Features The 61-920 is a digital clamp-on ground resistance tester. The instrument can measure the ground resist- ance by simply clamping around the ground conductor, ground rod or equipment ground conductor. The 61-920 also measures leakage AC current up to 30AAC. -
Page 6: Specifications
3. Specifications • Measuring range and accuracy Function Range Resolution Measuring range Accuracy Earth 20Ω 0.01Ω 0.00 20.99Ω ±1.5%±0.05Ω resistance 16.0 99.9Ω ±2%±0.5Ω 200Ω 0.1Ω (Auto-ranging) 100.0 209.9Ω ±3%±2Ω 399Ω ±5%±5Ω 1Ω 1200Ω 599Ω ±10%±10Ω 10Ω 1260Ω — AC current (ACA) 100mA 0.1mA 104.9mA... - Page 7 • Applicable standards IEC61010-1: 2001 (CAT. IV 300V Pollution degree 2) IEC61010-2-032: 2002 IEC61326: 2000 (EMC standard) • Electrostatic discharge Performance criteria B immunity • Withstand voltage AC5320Vrms/ 5 seconds Between the Transformer jaws fitted parts and Case enclosure (except for jaws) •...
-
Page 8: Instrument Layout
4. Instrument Layout • Feature callouts Transformer jaw Lever Backlight button Switches on/off the backlight Function button Switches ACA/Earth resistance function Memory mode button Records the measured value with a data number Data hold button Holds the indicated value. Release the held value Power button Turns the meter on/off Display unit (LCD) -
Page 9: Measurement Theory
5. Measurement Theory This instrument can measure the earth resistance to earth in multi-earthed system. Let's regard earth resist- ance under test as Rx, and the other earth resistances as R1, R2, …Rn. Of these earth resistances, R1, R2, …Rn can be considered connected in parallel and can be regarded as a combined resistance Rs. - Page 10 By applying the Voltage (V) to the circuit from the transformer jaw (CT1), current I is flowing in relation to the earth resistance. R can be determined by calculation after measuring the current with the other trans- former jaw (CT2). In this case, R displayed in this meter can be regarded as Rx because Rs can be regarded small enough against Rx.
-
Page 11: Preparation For Measurement
(2) Verify the correct measurement of earth resistance. Clamp the meter around the calibration plate to ensure proper operation. If the displayed value is outside the specified accuracy on the plate, send the instrument with the calibration plate back to IDEAL for repair. Resistor for operation check 1Ω... -
Page 12: Measuring Procedure
7. Measuring method DANGER • Never make measurements on a circuit in which the electrical potential exceeds 300VAC. • Transformer jaws are made of metal and their tips are not completely insulated. Guard against the possible shorting where the equipment under test has exposed metal parts. •... -
Page 13: Normal Measurement Of Current
7-1 Normal measurement of current * Press the Function button A/Ω and select the ACA function. * Confirm the displayed unit is " mA", and the " MEM" mark is not displayed at the upper left corner of the LCD. * Press the lever to open the transformer jaws and close them over a single conductor. -
Page 14: Measurement Of Earth Resistance
7-3 Measurement of earth resistance CAUTION • Follow the procedure described in "7-1 Normal measurement of current" and measure the current flowing on the earthed wire prior to the measurement of earth resistance. If " " is displayed in the upper right of the LCD, it means there is too much interference to NOISE obtain an accurate reading. - Page 15 Earth resistance measurement of a pole grounding electrode. Earth resistance measurement of a ground electrode in a street lighting system. Earth resistance measurement of a grounding electrode in a lightning protection system. Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.com Page 15...
-
Page 16: Other Functions
8. Other functions 8-1 Auto power-off function This is a function to conserve battery power when the instrument is accidentally left on. The meter automati- cally turns off 10 minutes after the last button operation. If auto power-off occurs, press the Power button to to return power to the meter. -
Page 17: Memory Feature
8-5 Memory function This function saves and displays several measurement results. • Saving the measurement results (1) Any data number (between 1 and 100) can be selected with the cursor button while on the ACA or ground resistance function Holding the cursor button down allows you to scroll through the numbers faster. (2) To save the measurement result being displayed on the LCD, press the button. -
Page 18: Battery Replacement
9. Battery replacement WARNING • In order to avoid possible shock hazard, remove the meter from the conductor under test, remove test leads from the meter, and turn off the instrument before removing the battery cover. CAUTION • Do not mix new and old batteries. Never use different types of batteries at the same time. •... -
Page 19: Service
10. Service If the instrument should fail to operate correctly, return it to: IDEAL INDUSTRIES, INC. Attn: Repair Department 1000 Park Ave. Sycamore, IL 60178 For repair, the calibration plate used for proper operation check must be returned with the meter. -
Page 20: Warranty
Any implied warranties arising out of the sale of an IDEAL product, including but not limited to implied war- ranties of merchantability and fitness for a particular purpose, are limited to the above. The manufacturer shall not be liable for loss of use of the instrument or other incidental or consequential damages, expenses, or eco- nomic loss, or for any claim or claims for such damage, expenses or economic loss.
Need help?
Do you have a question about the 61-920 and is the answer not in the manual?
Questions and answers