Martel Electronics 235 - Manual (Page 7)

Battery Charging
Units are shipped with the internal batteries in an uncharged state.
The calibrator battery charger is a wall plug-in type (see below) which
connects to a jack on the right-hand side of the instrument. Battery
operation time is 7-8 hours, typically.
2
230/235 Introduction
Note: Before using the Model 230/235 calibrator for the first time,
it is necessary to charge the batteries for a minimum of 14 to
16 hours.
CALIBRATOR CHARGER
INPUT: 120VAC 60 HZ
OUTPUT: 5.8VDC 200 mA
For use only with
Beta Calibrators