KYORITSU 3126 - Manual (Page 24)

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6-7 Filter function
KEW3126 has Filter function. Filter Mode is effective to reduce
the variations in readings due to external influences during high
resistance measurements. The filter type is Low pass filter with cut
off frequency of 0.3Hz.
Press the FILTER button to enable the Filter function. The Filter
mark then appears on the LCD. To check sudden variations in
resistances, ensure that the Filter mode is turned off.
6-8 Backlight function
This function to facilitate working at dimly illuminated location or
at nighttime work. The backlight doesn’t work when the Range
switch is set to “OFF”. It automatically turns off 2 min after the last
key operation; this feature is disabled while a measurement is
processed.
6-9 Auto-power-off function
The instrument automatically turns off approx. 10 min. after the last
switch operation. To restore from the auto power off status, set the
Range switch to OFF position once and then set it to any desirable
range.
Indicator
Power supply
Ｌ
Ｇ
Ｅ
Leakage current
Conductor
Insulation
Protective wire
Cable with sheath
（Insulation resistance tester）