H-25C Instruction Manual
Instruction 3015-0216
19
2.2.7 Setting the “CAL” (Calibration Mode Selector) Switch
There are two calibration modes: automatic calibration mode and manual calibration mode. If the
instrument is not equipped with the auto calibration function, then only manual calibration mode is
valid.
The calibration mode is selected using the “CAL” switch.
To select auto calibration mode you set the switch to the “AUTO” position, and to select the manual
calibration mode you set the switch to the “MANUAL” position.
2.2.8 Setting the “CAL INTVL” (Calibration Request Interval) Switch
The H-25C can issue requests for calibration operations at fixed intervals when A-type measurement
mode is selected. At the time of the calibration request, the speaker sounds an intermittent tone for
five seconds, and “CAL” is displayed with flashing in the display area (a maximum of ten times during
a 15-second period in the measurement mode. The interval between calibration requests can be set
in 1-hour increments up to 10 hours.
You use the “CAL INTVL” switch to set the calibration request interval.
Note that the calibration request interval timer is activated at the end of the warm-up time, and is
reset whenever power is turned OFF.
