|Length Of Scale:||Length Of Scale||Product Model:||Resistance Meter ZC25 Earth Resistance Tester|
120rpm Insulation Resistance Test Meter,
ZC25 Insulation Resistance Test Meter,
250v insulation resistance tester
Resistance Meter ZC25 Earth Resistance Tester
Resistance Meter ZC25
Instruction Resistance Tester
This Tester is used for measuring high resistance and testing electrical lines, windings of motors and generators, cables or other electrical installations during their installation, running, maintenance, repairs, etc. It can also be used as a common insulation tester.
This Tester consists of a hand-driven high voltage generator and an internal magnet cross coil current ratio meter. The current ratio meter adopts the new internal magnet type to provide steady and accurate readings .It is practically not sensitive to the influence of external magnetic fields.The hand-driven generator is equipped with a centrifugal governor which enables the rotor to rotate with constant speed for maintaining steady output voltage.This Tester is provided with a "Guard" terminal to prevent errors due to surface leakage, thus ensures accurate readings.
4. The Tester is enclosed in a light metal case, tightly sealed to prevent the ingress of moisture.
TYPE VOLTAGE RANGE MIN.SCALE
0101T 100V 0-100MΩ 0.05 MΩ
2525T 250V 0-250 MΩ 0.05MΩ
5050T 500V 0-500 MΩ 0.1MΩ
1010T 1000V 0-1000 MΩ 0.2 MΩ
Length of scale: Approx.65mm
Accuracy: Not over±1% of full scale length
Standard testing: Temperature & 20ºC±2ºC, 65±15%
Cranking Speed: 120rpm
Inclination Variation: Not over±1% of full scale at an inclination of10°
Temperature Variation: Not over±0.8% of full scale for every±10°change in ambient temperature.
External Magnetic Field Influence: Not over±2.5% of full scale length at a magnetic field influence of 5O rested.
Inclination Resistance: Not less than 20 me ohms at20°±2ºC and relative humidity of 65±15%.
Weight: Approx. 2.5kg
MAINTENANCE AND UPKEEP
1. In time of use, the Tester should be placed far away from magnetic fields and in level, stable position.
When measuring, first rotate the handle clock wise until the speed increases gradually up to approximately 120rpm at which the governor begins to slip and steady readings then be taken.When measuring insulation resistance, connect the two terminals of the object to "Earth" and "Line" respectively, then rotate the handle and take the readings.When making "Earth" test, connect the object terminal to "Line" and a good earth wire to "Earth" terminal.When measuring insulation resistance between cable core and sheath, besides connecting the two terminals of the object to "Earth" and "Line" connect also the intermediate insulation layer between the core and sheath to "Guard" to eliminate possible surface leakage which may cause errors in readings.Stand wire cords being well separated, should not be used as testing leads between the terminals of the object in order to avoid incorrect readings due to inadequate insulation.The use of the Tester under thunder-bolts or in the vicinity of high tension installations should be prohibited. It may only be used when the object is not charged or electric sources.Before and after measuring, the object must be discharged completely to ensure safety of personnel and installations.The rotating speed of the handle should be increased gradually. If the pointer is found to remain at 0, the operation should be discontinued at once to prevent the tester from damage.Violent and continuous vibrations should be avoided as far as possible, so that the pivot of the tester may not be damaged or the sapphire bearing broken thereby affecting the accuracy of the tester.When not in use,the tester should be placed in a cabinet at ordinary room temperature. It should never be put on dirty or wet grounds, or at the place where the air is contaminated with alkaline and/or acid vapors.
Rc - Current circuit resistor
Rp - Voltage circuit resistor
Nc - Current circuit coil of indicator
Np - Voltage circuit coil of indicator
F - Generator
Contact Person: Rocky