T-3720 earth resistance clamp tester is a ground resistance measurement instrument. It uses a new generation of LCD black screen backlight display and microprocessor technology. Ω+A synchronously displays the grounding resistance by induction. It does not need to measure the grounding system in the loop. It is safe and fast to disconnect the earthing lead off line without auxiliary electrodes. It is widely used in telecommunications, electric power, meteorology, engine room, oil field, power distribution line, tower transmission line, gas station, factory grounding grid, lightning rod and so on. The instrument has the characteristics of accurate, fast, simple, stable and reliable.
PARAMETERS
Electrical parameters
Model
T-3720, including USB & clock function; 0-1200Ω, 0-20A
T-3720A, including USB & clock function; 0-1500Ω, 0-40A
T-3720B, Price is cheap, function simply, 0-500Ω
Power Supply
6VDC 4 PCS of AA Alkaline LR6 batteries
Resistance Range
0.01-1500Ω; 0.01-1200Ω; 0.01-500Ω
Resistance Resolution
0.001Ω
Resistance Accuracy
±1%±0.01Ω
Current Range
0.00mA-20.0A; 0.00mA-40.0A
Current Resolution
0.05mA
Current Accuracy
±2.5%±1mA
Data memory
500 Sets
Alarm Threshold Setting Range
Resistance: 1-199Ω
Setting Range of Current Alarm Critical Value
1mA -499mA
LCD Screen
4 Digits Black LCD display, Screen L×W: 47mm×28.5mm
Clamp Size
55mm×32mm
Clamp Opening
32mm
Protection Level
Dual Insulation
Structural Feature
Clamp CT
Shifting
Automatic shifting
External magnetic field40A/m
External electrical field1V/m
Single measurement time
0.5 second
Resistance measurement frequency1KHz
Measured current frequency
50/60Hz Automatic measurement
Power Consumption
Max 50mA either in booting up or normally working, Continuously working for 30 hours
Safety Standard
IEC/EN61010-1; IEC1010-2-032; Pollution level 2, CAT IV(600V)
IEC/EN61557-5, 13, 16; IEC61326
Communication port
USB port
Mechanical parameters
Dimensions (L×W×T) (mm)
285mm×85mm×58mm
Weight (kg)
1.18 (With batteries)
Environmental conditions
Operating temperature
-10°C to +50°C
Storage Temperature
-40°C to 70°C
Relative humidity
≤90%RH