KYORITSU 2417 - Manual (Page 11)

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5. PREPARATIONS FOR TESTS
 WARNING
Always inspect your instrument and accessories for any
sign of damage or abnormality before every use. If any
abnormal conditions exist (eg. cracked cases, display not
reading, etc.), do not attempt to conduct any tests.
5-1 Battery Check
To check the battery voltage set the Power/Range Selector Switch
to OFF position. If the display is clear without symbol "B" showing,
battery voltage is OK. If the display blanks or "B" is indicated,
replace the battery according to section 7 for Battery replacement.
NOTE
The instrument automatically turns power off approximately 30
minutes after it is turned on. Therefore the display may be
blank with the Power/Range Selector Switch set to On position.
To operate the instrument, set the switch back to OFF position
and then ON position.
5-2 Data Hold Switch
If the Data Hold Switch is pressed in (DATA HOLD mode), press to
release it.
Otherwise, the display remains frozen. When the instrument is in
DATA HOLD mode, "H" symbol is indicated on the display.