Kyoritsu Electrical Instruments Works 6200, Instruction Manual

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5.2-4 NULL setting (Protective conductor resistance range)
According to below figure, set the range switch to the range for protective
conductor resistance (either 20
Ω + or 20 Ω - is OK). Press NULL button after
short-circuited PE/2mA and RPE -Test lead terminals with RPE-Test Lead.
Make sure that the "
" mark appears on the LCD and indicated value is
"0.00
Ω
" ; Data is corrected.
CAUTION
●
When pressing NULL button, the indicated value is stored as a reference
value. After that, the difference between the reference value (stored
value) and measuring value is indicated on the LCD.
● The " " mark is displayed on the LCD while the NULL function is
operating. Each time pressing NULL button, NULL function shall be
turned on and off.
●
NULL function can not be released by changing the range while it is
operating. To release the function, power off the instrument.
●
NULL function works on both 20
Ω
+ range and 20
Ω
- range, therefore,
there is no need to do NULL setting at both ranges.
●
For the measuring method shown in the following clause 6.3 and 6.4,
NULL setting is required also for an optional cord.
NULL
！
RPE -Test lead terminal PE/2mA terminal
Fig.9
NULL