Related Manuals for Sperry instruments 3121
Summary of Contents for Sperry instruments 3121
- Page 1 7 / 05 FORM#341 OPERATING INSTRUCTIONS Model-3121・3122 Model-3123 HIGH VOLTAGE INSULATION TESTER MODEL 3121 ・ 3122 ・ 3123...
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Page 2: Table Of Contents
CONTENTS Page 1．Features …………………………………………………………1 2．Specifications ……………………………………………2 ∼ 3 3．Instrument Layout ………………………………………………4 4．Operating Instructions …………………………………………5 4-1．Mechanical Zero Adjustment ……………………………5 4-2．Battery Check ……………………………………………5 4-3．Insulation Resistance Measurement ……………………6 4-4．Continuous Measurement ………………………………6 4-5．Use of Guard Terminal …………………………………7 5．Battery Replacement ………………………………………8 6．Cleaning Meter Cover ... -
Page 3: 1．Features
1. Features ● Battery powered, the instruments test insulation up to 100000MΩ at 2500V for Model 3121, 200000MΩ at 5000V for Model 3122 and 200GΩ at 5000V and 400GΩ at 10000V for Model 3123. ● Suited for heavy duty electrical maintenance and servicing of industrial installations, cables, transformers, generators and switchgear where high voltage insulation tests are required. -
Page 4: 2．Specifications
2. Specifications Model 3121 Model DC Test Voltage 2500V 5000 0∼2000MΩ/ 0∼5000 M Measuring Ranges 1000∼100000MΩ 2000∼ 20 （automatic change） (automatic ch ±5% of reading ±5% of re （200∼ 10 （100∼50000MΩ） ±10% of reading ±10% of re or 0.5% of scale length or 0.5% of sc... - Page 5 3122 Model 3123 5000V 10000V 00 MΩ/ 0∼5GΩ/2∼200GΩ 0∼10GΩ/4∼400GΩ ∼ 200000MΩ (automatic change) (automatic change) tic change) of reading ±5% of reading ±5% of reading ∼ 100000MΩ） （0.2∼100GΩ） （0.4∼200GΩ） of reading ±10% of reading ±10% of reading of scale length or 0.5% of scale length or 0.5% of scale length es other than...
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Page 6: 3．Instrument Layout
3. Instrument Layout ① ③ ② ④ ④ ⑤ ⑥ ⑦ Fig.1 ① Line Probe ② Guard Terminal ③ Earth Terminal ④ LED's for High& ⑤ Press to Test Button Low Range Indication ⑥ Function Switch ⑦ Battery Compartment Cover − 4 −... -
Page 7: 4．Operating Instructions
4. Operating Instructions CAUTION: BE CAREFUL ABOUT HIGH VOLTAGE PRESENT ACROSS LINE AND EARTH TERMINALS OF INSTRUMENT WHEN PRESS TO TEST BUTTON IS OPERATED. MAKE SURE TO EARTH CIRCUIT UNDER TEST. ALWAYS CONNECT EARTH TERMINAL OF INSTRUMENT TO EARTH. THE BUZZER WILL KEEP SOUNDING DURING INSULATION RESISTANCE MEASUREMENT. -
Page 8: Insulation Resistance Measurement
With the function switch set at MΩ position for Model 3121 and 3122 or GΩ position for Model 3123, place the line probe in contact with the circuit under test and operate the press to test button. -
Page 9: Use Of Guard Terminal
4-5. Use of Guard Terminal Illustrated in Fig. 2 is an example of the insulation resistance measurement of an electric wire. If the line probe is simply connected to the wire conductor and the earth lead to the immersion liquid container as shown, a measurement error will be introduced as this results in the measurement of the combined resistance of insulation resistance and the surface leakage resistance at the cut end of the electric wire. -
Page 10: 5．Battery Replacement
（For your information, optional adaptor Model 8020 is available to allow Model 3121,3122 and 3123 to be connected to a recorder for recording insulation resistance. It provides an output signal of 1 μA/10mV DC.） 6. Cleaning Meter Cover Do not try to remove dirt on the meter cover by rubbing hard with a dry cloth. - Page 11 A.W.SPERRY INSTRUMENTS INC. ATT: Customer service dept. 2150 Joshua’ s Path, Suite 302,...
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