| 详细介绍 |
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1、全自动测试，具有20／200／2k／20kΩ四个测试量程，自动转换。可三端，四端测试，可测接地电阻及土壤电阻率。读数由3 1/2位数字液晶屏显示。
2、操作简单，测试讯速，典型测试仅约15秒。充电电池工作，重仅1.27KG，便携。电池一次充 电可满足600次15秒的典型测试。
3、精度（23°C）：±读数的2％±1位。适于测试简单或复杂的接地系统。
4、抗干扰能力强，干扰抑制达40V。
5、若干扰过大，读数无效时，仪器会自动提示。
6、 测试频率：128Hz±0.5Hz ; 测试电压：50V（峰值）;测试电流：0.1mA~10mA ; 耐压水平：任何两个端子均可耐压250Vac。 |
| 功能描述 |
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| 设计符合IP54标准（防潮／湿保护） |
有 |
| 噪音抗干扰性 |
40V |
| 小钎子（用于户外区域测试） |
有 |
| 中型接地和电阻系统测试（测试范围宽） |
有 |
| 小型接地系统 |
有 |
| 任选接地测试组件 |
有 |
| 持有证书 |
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CE |
| 其它 |
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?Simple, fully automatic operation
?Choice of three or four terminal measurement
?Autoranging from 10 mΩ to 20 kΩ
?Tests to BS7671, BS7430, BS6651 and VDE 0413
?High tolerance to spike resistance helps testing in urban areas
?Noise rejection to 40 V
The Megger?DET5/4D and DET5/4R are fully automatic, four terminal instruments built into a rugged, water resistant case giving protection for outdoor use. The instrument is suitable for the testing of earth electrodes and measuring earth resistivity.
Operation is started by pushing one of two buttons on the front panel; one for three terminal measurement and one for four terminal testing. All other functions of the instrument are completely automatic. The instrument checks for conditions that may cause an invalid reading during a test. The low service error and wide operating
temperature range enable accurate results to be achieved
in real on-site conditions.
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