Digital Grounding Resistance Measuring Instrument DY2571

Working Principle
    DY2571 grounding resistance tester abandons the traditional manual power generation mode, adopts advanced medium and large scale integrated circuits, and combines the three terminal button and four terminal button measurement methods into a new type of grounding resistance tester with DC/AC conversion technology.
    The working principle is that the DC/AC converter inside the machine changes DC into AC low frequency constant current, forms a loop through the auxiliary grounding electrode C and the tested object E, generates AC voltage drop on the tested object, sends it to the AC amplifier for amplification through the auxiliary grounding electrode P, and then sends it to the meter head for display through wave detection. With the aid of multiplying switch, three different limits can be obtained: 0~2 Ω, 0~20 Ω, 0~200 Ω.

Product Features
·In the structure, high-strength aluminum alloy is used as the housing. In the circuit, the phase-locked loop synchronous tracking detection mode is used to prevent power frequency and RF interference, and the switched capacitor filter is used to make the instrument have better anti-interference ability.
·DC/AC conversion technology is adopted to change DC into AC low frequency constant current for measurement.
·The auxiliary grounding resistance is allowed to change between 0~2K Ω (RC) and 0~40K Ω (RP), so as not to affect the measurement results.
·This instrument does not need manual balance adjustment. It is displayed on a 3 (1/2) bit LCD. In addition to measuring ground resistance, it can also measure low resistance conductor resistance, soil resistivity and AC ground voltage.
·If the meter head shows "1" when the test circuit is not connected, it represents overflow, which conforms to the conventional measurement habits.

Technical Indicators
1. Conditions of Use
    Ambient temperature: 0 oC~+45 oC
    Relative humidity: ≤ 85% RH
2. Measuring range and constant current value (effective value)
    Resistance: 0~2 Ω (10mA), 2~20 Ω (10mA), 20~200 Ω (1mA)
    Voltage: AC 0~30V
3. Measurement accuracy and resolution
    Precision: 0~0.2 Ω≤± 3% ± 1d
                     0.2Ω~200Ω≤±1.5%±1d
                     1~30V≤±3%±1d
    Resolution: 0.001 Ω, 0.01 Ω, 0.1 Ω, 0.01V
4. Measurement error caused by auxiliary grounding resistance and ground voltage
·Allowable auxiliary grounding resistance RC (between C1 and C2)<1.8K Ω;
RP (between P1 and P2)<40K Ω Error ≤± 5%
·Allowable ground voltage ≤ 5V (effective value of power frequency) error ≤± 5%
5. Power supply and power consumption
Maximum power loss ≤ 2W
Power supply: 6.8V~9V (seven 5 # rechargeable battery packs), external 220V AC power supply for charging.
Volume: 220mm × 200mm × 105mm
Weight: ≤ 1.4kg