KYORITSU 2009R - Manual (Page 16)

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５．Preparation for Measurement
５－１ Checking Battery Voltage
① Set the function selector switch to any position other than
"OFF".
② When the display is clear without "BATT" showing, proceed to
measurement.
③ When the display blanks or "BATT" is indicated, replace the
battery according to section 8. Battery Replacement.
NOTE
● The Auto-power-off feature automatically turns the instrument
off in about 10 minutes after the last switch or button operation.
Therefore, the display may be blank even with the function
selector switch set to a position other than "OFF". To operate
the instrument in this case, turn the switch back to the "OFF"
position, then to any other position.
５－２ Checking Switch Setting and Operation
Make sure that the function selector switch is set to the correct
position, the instrument is set to the correct measuring mode
and the Data Hold function is disabled. Otherwise, desired
measurement cannot be made. (See section 6 for measurement
instructions and section 7 for notes on functions.)