KYORITSU 4202 - Manual (Page 11)

̶ 9 ̶
6. Getting started
(1) Check the battery voltage
When nothing is displayed on the LCD, press the power button and turn
on the instrument. Battery voltage is enough when indication is clear and the
" " symbol is not displayed on the LCD after turning on the instrument.
Follow the procedure described in “9. Battery replacement” and replace the
batteries with new ones when any of following symptoms is noted. Otherwise,
accurate measurement and proper saving cannot be ensured.
* " " symbol is being displayed.
* indications are faint and difficult to read.
* nothing is displayed on the LCD.
(2) Verify the correct measurement of earth resistance
Clamp-on the supplied resistor for operation check as shown below, and verify
that the Transformer jaw and the circuit works correctly. When the indicated
value is within the range described below, they are operating correctly. If the
indicated value is greatly exceeding the accuracy, send the instrument to your
local KYORITSU distributor for repair or recalibration.
For repair, the resistor for operation check shall be attached and returned
together with the instrument.
# CAUTION
This instrument performs self-calibration for about 3 seconds when it is turned
on. (" " is displayed on the LCD.) Do not clamp onto any conductor or
open the jaws in this period. Otherwise, inaccurate measurement may occur.
Resistor for operation check
1 Ω
10 Ω
Allowable range
0.93 ∼ 1.07
9.75 ∼ 10.25