Profile:
The KD2571 ground resistance tester abandoned the traditional manual power generation mode, adopted the medium and large scale integrated circuit, and applied DC/AC conversion technology to combine the three-end button and four-end button measurement methods into a new type of ground resistance measuring instrument. The working principle is that the DC/AC converter in the machine changes the DC into AC low-frequency constant current, and the circuit is formed by the auxiliary grounding pole C and the measured object E, and the AC voltage drop is generated on the measured object, which is sent to the AC amplifier through the auxiliary grounding pole P for amplification, and then sent to the watch head for display through the detection. With the power switch, three different limits can be obtained: 0~2Ω, 0~20Ω, 0~200Ω.
Features:
In the structure, aluminum alloy is used as the housing. In order to prevent power frequency and radio frequency interference, phase-locked loop synchronous tracking detection mode is adopted on the circuit and switched capacitor filter is used to make the instrument have better anti-interference ability.
DC/AC conversion technology is used to change DC into AC low-frequency constant current for easy measurement.
This instrument does not need manual adjustment balance, 3(1/2) LCD display, in addition to measuring ground resistance, but also low resistance conductor resistance, soil resistivity and AC voltage.
If the test loop does not display "1" on the meter head, it means overflow, which is in line with conventional measurement habits.
Parameter:
Technical index
1, use conditions: ambient temperature: 0℃~+45℃; Relative humidity: ≤85%RH
2, measuring range and constant current value (effective value) :
Resistance: 0~ 2ω (10mA), 2~ 20ω (10mA), 20~200Ω(1mA)
Voltage: AC 0~30V
3, measurement accuracy and resolution:
Accuracy: 0~0.2Ω≤±3%±2d; 0.2Ω~200Ω≤±1.5%±1d; 1~30V≤±3%±1d
Resolution: 0.001Ω, 0.01Ω, 0.1Ω, 0.01V
4. Measurement error caused by ground voltage:
Allowable ground voltage ≤5V (power frequency RMS value)
Error ≤±5%
5. Power supply and power consumption:
Maximum power loss ≤2W
Power supply: 6.8V~9V (7 5# rechargeable battery packs), external 220V AC power supply for charging.
Volume: 220mm×200mm×105mm
Weight: ≤1.4kg
