Kewtech KT72 User Manual

10
4.1 General specification, measuring range and accuracy
Measurement of earth continuity (protective conductor resistance) - RPE
Test function 200mA continuity
Measuring range
0 ~ 19.99Ω
(including pre-set Null values) (*2)
Resolution 10mΩ
Open-circuit voltage 5V DC
Measuring current 200mA DC (nominal)
Accuracy ± (3%rdg+5dgt)
(*2): Test lead resistance of 3Ω or less can be cancelled by NULL
function.
Measurement of insulation resistance - RINS
Output voltage 250V 500V
Measuring range 0.1~19.99MΩ
Resolution 10kΩ
Open-circuit voltage 250V (+30%/-0%) 500V (+30%/-0%)
Nominal current
1mA DC min.
@250kΩ
1mA DC min.
@500kΩ
Short-circuit current 2.5mA DC or less
Accuracy ± (2%rdg+3dgt)
Measurement of substitute leakage current test - LEAK
Test function Leakage current test
Measuring range 0.1~12.00mA rms, 50Hz AC
Resolution 0.01mA
Accuracy ± (3%rdg+5dgt)
4.2 Threshold and display
Function
Earth
Continuity
Insulation
Resistance
Polarity
Leakage
Current
Class I 200mA RPE ≦ 0.1Ω(*3) RINS ≧ 1MΩ − LEAK ≦ 0.75mA
Class ll − RINS ≧ 2MΩ − LEAK ≦ 0.25mA
Extension Lead RPE ≦ 0.1Ω(*3) RINS ≧ 1MΩ Cont ≦ 10Ω −
(*3): Extension leads and appliances with long mains leads have a
greater resistance allowance for earth continuity. Please refer to the
table 1 on next page.
¤ Green (RPE ≦ 0.1Ω) = Pass for all ap
pliances
¤ Orange (0.1Ω＜ RPE ＜ 0.3Ω) = Pass for appliances with extended
mains leads
¤ Red (RPE ≧ 0.3Ω) = Fail
4.Specification

Kewtech KT72 Specifications

General

Brand	Kewtech
Model	KT72
Category	Test Equipment
Language	English