NA3571接地电阻测试仪

 产品简介 

NA3571接地电阻测试仪适用于电力、邮电、铁路、通信、矿山等部门测量各种装置的接地电阻以及测量低电阻的导体电阻值；NA3571接地电阻测试仪还可测量土壤电阻率及地电压。

产品别名

接地导通测试仪，接地电阻测试仪，医用接地电阻测试仪，数字接地电阻测试仪

产品特性 

·NA3571接地电阻测试仪结构上采用高强度铝合金作为机壳，电路上为防止工频、射频干扰采用锁相环同步跟踪检波方式并配以开关电容滤波器使仪表有较好的抗干扰能力。

·采用DC/AC变换技术将直流变为交流的低频恒定电流以便于测量。

·允许辅助接地电阻在0~2KΩ（RC），0~40KΩ（RP）之间变化，不致于影响测量结果。

·NA3571接地电阻测试仪不需人工调节平衡，3(1/2)位LCD显示，除测地电阻外，还可测低电阻导体电阻、土壤电阻率以及交流地电压。

·如若测试回路不通表头显示“1”代表溢出，符合常规测量习惯。

产品参数

使用条件

环境温度

0℃~+45℃

相对湿度

≤85%RH

测量范围及恒流值(有效值)

电    阻

0~2Ω（10mA），2~20Ω(10mA)，20~200Ω(1mA)

电    压

AC  0~30V

精  度

0~0.2Ω

≤±3%±1d

0.2Ω~200Ω

≤±1.5%±1d

1~30V

分辨率

0.001Ω、0.01Ω、0.1Ω、0.01V

辅助接地电阻及地电压引起的测量误差

允许辅助接地电阻RC(C1与C2之间)<1.8KΩ；RP(P1与P2之间)<40KΩ  误差≤±5%

允许地电压≤5V(工频有效值)  误差≤±5%

功率损耗

≤2W

电  源

6.8V~9V（7节5#可充电电池组），外接220V交流电源进行充电

体  积

220mm×200mm×105mm

重  量

≤1.4kg

Product introduction 

The Digital Earth Resistance Tester abandon the traditional hand generate working method, use advanced large scale integrated circuits, apply to DC / AC conversion technology, which combine the three terminal and four terminal measurement models into a new earth resistance measuring instrument.

Operation principle:

Transform DC into AC low frequency constant current by build-in DC / AC converter, then through the auxiliary earth electrode C and tested object E form a circuit, it will generate AC voltage drop on the measured object, through the auxiliary ground electrode P send into AC amplifier to magnify, and through the detector into the meter to display. By using the multiplying power, can get three different range: 0~2Ω, 0~20Ω, 0~200Ω.

This tester applies to measure ground resistance of various devices and low resistance conductor resistance in electricity, telecommunications, railways, telecommunications, mining and other sectors; This tester also can measure soil resistivity and ground voltage.

Also called name

Ground continuity tester, ground resistance tester, Medical Ground Resistance Tester

The Characteristics of the products

1.Adopt high strength aluminum alloy case, in order to prevent power frequency and radio frequency interference, it use phase-locked loop synchronously tracking detecting method, and also equip with switching capacity filter, that make the tester with high anti-jamming capability.

2.Adopt DC / AC conversion technology, change DC to AC low frequency constant current, in order to measure.

3.Allow the earth resistance changing between 0~2KΩ (RC) and 0~40KΩ (RP), it does not affect the measured result.

4.No need to regulate balance artificially, 3(1/2) bit LCD display, not only can measure the earth resistance, but also can measure low resistance conductor resistance, earth resistivity and AC earth voltage.

5.If measure the test loop fails, the meter shows "1", means overflow, that conform to the standard habit of measurement.

The parameters of the products 

1. Operation condition

Temperature:0℃~+45℃

Relative humidity: ≤85%RH

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

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

  Voltage: AC  0~30V

3. Measure accuracy and resolution

  Accuracy: 0~0.2Ω≤±3%±1d

  0.2Ω~200Ω≤±1.5%±1d

  1~30V≤±3%±1d

Resolution: 0.001Ω, 0.01Ω, 0.1Ω, 0.01V

4. Auxiliary grounding resistance and error caused by grounding voltage

·Allowed auxiliary grounding resistance RC( between C1 and C2)<1.8KΩ;

  RP( between P1 and P2)<40KΩ, Error ≤±5%

·Allowed grounding voltage ≤5V (power frequency valid value)  error ≤±5%

5. Power and power consumption

Max power consumption ≤2W

Power supply: 6.8V~9V (7 5#rechargeable battery group), external AC 220V power source.

Dimension: 220×200×105mm(LWH)

Weight:≤1.4kg

Product information

1, be sure to read this before using the manual, and follow the instructions steps accordingly.

2, do not use non-original accessories provided, to avoid danger.

3, test equipment must be grounded.

4, the operator must be familiar with the operating procedures of the tester before use.

5, do not adjust other button during the whole measurement process.

6, completed the test, make sure all in the reset mode before removing the wiring.

7, do not block slit or vents, ensuring the cooling effect of the instrument function well,.

8, avoided in the following environments:

(1) Avoid direct sunlight, rain or moisture;

(2) Keep away from fire and heat;

(3) Must shut down and remove the power cord before handling or maintenance.