UNI-T UT521

UT521 USERS MANUAL
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3.3 Measure methods:
(1) Earth Voltage Testing:average respond
(2) Earth Resistance Testing : testing signal frequency : around 820Hz,current :
20 position around 3.2mA
3.4 Maximum operating accuracy:
Maximum operating accuracy within measure range:( 30%)
20 : 5.00 ~20.00
200 : 20.0 ~200.0
2000 : 200 ~2000
3.5 Working condition:
Temperature:5 ~40
Relative humidity: 80%RH(no fog)
Height above Sea Level: 2000 meters
3.6 Storage condition:
Temperature:-20 ~60
Relative humidity: 75%RH(no fog)