AEMC 5100 User Manual

Megohmmeter Models 5000N/5100/5110- 22 -OPERATION: MODELS 5000N, 5100 & 5110The Analog ScaleBefore taking any measurements, verify that the pointer is zeroedcorrectly (red AC scale "0"). If it is not, adjust with the mechanicalzero adjust screw.The analog scale serves two functions:First, it indicates the actual resistance of the insulating material undertest (black scales). The TOP scale is used for measurement on the MΩand GΩ ranges. The bottom half (MΩ) covers the range of 30MΩ to30,000MΩ (3MΩ to 30,000MΩ for Model 5110), reading from left to right.The upper half of the scale (GΩ) covers the range of 3GΩ to 3000GΩand reads right to left.The center portion of the scale is used for the low insulation test range of10kΩ to 30,000kΩ, reading from right to left.The bottom red arc is an AC/DC voltmeter that is divided into 10 voltincrements. The voltmeter function is operable any time the PUSH-TO-TEST button is out. The voltmeter detects the presence of voltage on theequipment to be tested. (If voltage is detected, do not proceed withthe insulation test).The voltmeter function also indicates if, after completing insulationtesting, the sample under test has stored a dangerous capacitive charge.The instrument discharges this capacitance internally and the needle willdrop accordingly. Disconnect the meter when the sample is discharged.Warning:Electrical equipment and cables may have sufficient capacitance to storea dangerous charge from the instrument test current. For properdischarge to occur the PUSH-TO-TEST button must be in the OFFposition with the sample connected between the EARTH and LINEterminals.On prolonged tests, the PUSH-TO-TEST button may be locked in the ONposition; care should be taken in this mode that no damage is done if theinstrument is left unattended.