First, the instrument introduction
1, working principle
The grounding resistance tester rejects the traditional manual hand-cranked power generation mode, adopts advanced medium-large scale integrated circuits, and combines the three-terminal and four-terminal button measurement methods into a new type of grounding resistance measurement using DC/AC conversion technology. instrument.
The working principle is that the DC/AC converter in the machine converts the direct current into a low-frequency constant current of the alternating current, and the auxiliary grounding electrode C and the measured object E form a loop, and an AC voltage drop is generated on the measured object, and is sent through the auxiliary grounding pole P. The AC amplifier is amplified and then sent to the meter display after detection. With the override switch, three different limits are available: 0 to 2 Ω, 0 to 20 Ω, and 0 to 200 Ω.
2, the scope of use
The grounding resistance tester is suitable for measuring the grounding resistance of various devices and measuring the resistance of low resistance conductors in electric power, post and telecommunications, railway, communication, mining, etc. The grounding resistance tester can also measure soil resistivity and ground voltage.
3, the main features
â— The structure uses high-strength aluminum alloy as the casing. In order to prevent power frequency and radio frequency interference, the phase-locked loop synchronous tracking detection method is adopted and the switch capacitor filter is matched to make the instrument have better anti-interference ability.
â— Use DC/AC conversion technology to convert DC into AC low-frequency constant current for measurement.
◠Allow the auxiliary grounding resistance to vary between 0 and 2KΩ (RC) and 0 to 40KΩ (RP) without affecting the measurement results.
â— The grounding resistance tester does not need to manually adjust the balance. The 3 (1/2) digit LCD display can measure the low resistance conductor resistance, soil resistivity and AC ground voltage in addition to the earth resistance.
â— If the test circuit does not pass the meter display "1" for overflow, it is in accordance with the usual measurement habits.
Second, technical indicators
1, the conditions of use
Ambient temperature: 0 °C ~ +45 °C
Relative humidity: ≤85% RH
2, measurement range and constant current value (effective value)
Resistance: 0 to 2 Ω (10 mA), 2 to 20 Ω (10 mA), 20 to 200 Ω (1 mA)
Voltage: AC 0 ~ 20V
3, measurement accuracy and resolution
Accuracy: 0~0.2Ω≤±3%±2d
0.2Ω～200Ω≤±5%±2d
1~20V≤±5%±2d
Resolution: 0.001 Ω, 0.01 Ω, 0.1 Ω, 0.01V
4. Measurement error caused by auxiliary grounding resistance and ground voltage
â— Allow auxiliary grounding resistance RC (between C1 and C2)
0 to 2 Ω, 2 to 20 Ω ≤ 1 K Ω
20～200Ω ≤2KΩ
RP (between P1 and P2) <40KΩ error ≤±5%
◠Allowable ground voltage (power frequency effective value) ≤ 5V error ≤ ± 5%
5, power and power consumption
Maximum power loss ≤ 2W
DC: 8 × 1.5V (AA, R6) battery
Exchange: 220V/50Hz
6. Volume and weight
Volume: 217mm × 217mm × 133mm
Weight: ≤1.8kg
Semi-automatic Sealing Machine
Guangdong Xtime Packaging Equipment Co., Ltd. , https://www.xtimepackaging.com