KYORITSU 2009A - Manual (Page 14)

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５．Preparation for Measurement
５−１ Checking Battery Voltage
①Set the function selector switch to any position other than "OFF".
②When the display is clear without "BATT" showing, proceed to
measurement.
③When the display blanks or "BATT" is indicated, replace the battery
according to section 8. Battery Replacement.
NOTE
● The Sleep feature automatically turns the instrument off in about
30 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, or press any button.
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.)