I. Product introduction

1. Working principle

This meter abandon the traditional manual power generation working mode, using the advanced medium and large scale integrated circuit, the application of DC/AC conversion technology will be three button, four button measurement method combined into a new type of grounding resistance measuring instrument.

The working principle is that the DC/AC converter inside the machine changes the DC into the low frequency constant current of THE AC, through the auxiliary grounding pole C and the measured object E constitute a loop, the measured object produces AC voltage drop, through the auxiliary grounding pole P into the AC amplifier amplification, and then through the detection into the meter head display. With the help of the rate switch, three different limits can be obtained: 0 ~ 2 ω, 0 ~ 20 ω, and 0 ~ 200 ω.

2. Scope of use

This table is suitable for measuring the grounding resistance of various devices and the resistance value of low resistance conductor in electric power, post and telecommunications, railway, communication, mining and other departments. The meter can also measure soil resistivity and ground voltage.

3. Main features

· In structure, high-strength aluminum alloy is used as the housing. In order to prevent power frequency and radio frequency interference, phase-locked loop synchronous tracking detection mode and switched capacitor filter are adopted on the circuit, so that the instrument has good anti-interference ability.

· Use DC/AC conversion technology to change DC into AC low-frequency constant current for easy measurement.

· The auxiliary grounding resistance is allowed to vary between 0 ~ 2K ω (RC) and 0 ~ 40K ω (RP) without affecting the measurement results.

· The meter does not need manual balance adjustment, 3(1/2) LCD display, in addition to geodetic resistance, can also measure low resistance conductor resistance, soil resistivity and ac ground voltage.

· If the test loop is not working, the meter head shows "1" means overflow, which is in line with conventional measurement habits.

Two, technical indicators

1. Conditions of use

Ambient temperature: 0 ° C to +45 ° C

Relative humidity: ≤85%RH

2. Measurement range and constant current value (effective value)

Resistance: 0 ~ 2 ω (10mA), 2 ~ 20 ω (10mA), 20 ~ 200 ω (1mA)

Voltage: AC 0 ~ 20V

3. Measurement accuracy and resolution

Accuracy: 0 ~ 0.2 ω ≤±5%± 2D

0.2 Ω ~ 200 Ω plus or minus 5% plus or minus 2 d or less

1 ~ 20 v + / - 5% plus or minus 2 d or less

Resolution: 0.001 ω, 0.01 ω, 0.1 ω, 0.01V

4. Measurement error caused by auxiliary grounding resistance and ground voltage

· Allow auxiliary grounding resistance RC (between C1 and C2)

0 ~ 2 ω, 2 ~ 20 ω ≤1K ω

20 ~ 200 Ω Ω 2 k or less

RP (between P1 and P2) < 40 k Ω error of plus or minus 5% or less

· Allowable ground voltage (effective value of power frequency) ≤5V Error ≤±5%

5. Power supply and power consumption

Maximum power loss ≤2W

Dc: 8 x 1.5V(AA, R6) battery

Communication: 220 v / 50 hz

6. Volume and Weight

Size: 217 mm * 217 mm * 133 mm

Weight: 1.8 kg or less