Kyoritsu 6202 Uživatelský manuál stáhnout pdf (Strana 17)

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7. Measuring method

7.1 Measuring protective conductor resistance (RPE)

The measurement of protective conductor resistance is of course not possible

for devices which are not equipped with a protective conductor (e.g. Safety

Class ll and III devices).The objective of this test is to ensure the connection

between the earth or the protective conductor of the commercial power earth

pin and the metal casing and accessible conductive parts of the DUT is

satisfactory and of a low enough resistance value to satisfy safety standards.

And this measurement should be done also by reversing the output polarity.

(1) Connect the DUT as described in clause 6.

(2) Set the range switch to the "RPE 20Ω+" position.

(3) Read the measured value in "Ω" from the LCD.

(4) Set the range switch to the "RPE 20Ω-" position.

(5) Move the cable from the DUT during a measurement, section by

section over its entire length, in order to locate interruptions.

Results

Protective conductor resistance may not exceed the following values.

Maximum allowable protective conductor resistance values depending on

cable length

Under no circumstances may a value of 1Ω be exceeded. The table is also

valid for cable reels and extension cables.

CAUTION

● Follow the procedure described in 5.2-4 and do NULL setting before a

measurement.

● Alligator clip must make good contact with the enclosure of the DUT.

● When the terminal is open or the resistance value exceeds measuring

range, "OL" mark (over range display) appears on the LCD.

！

Length to (m)

Max. resistance (Ω)

0.3

12.5

0.4

0.5

27.5

0.6

0.7

42.5

0.8

0.9

More than 50m

1.0

Displayed on 20Ω+ range

Displayed on 20Ω- range

Displayed at NULL

setting

Fig.14

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 23 24

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