Using the Battery Option C
Keysight 53150A/151A/152A Operating Guide 125
Operating the Counter from the Batteries
When the Counter is powered from the internal batteries, it operates in the same
manner as it does when it is powered from an external AC or DC source, except
that the cooling fan does not operate, and the Main AC Power On LED is not lit.
Whenever a battery-equipped Counter is on (not in Standby), the battery
annunciator in the lower-right corner of the front-panel display (see Figure C-1)
indicates the approximate charge level remaining in the batteries. This allows you
to estimate the amount of time you can continue to operate from battery power
before recharging the batteries or replacing them with fully charged batteries.
Figure C-1 Battery Charge Level Indicator
When all three segments of the battery annunciator are activated, the battery
charge level is at 83% or more. When only two segments are activated, the charge
level is approximately 50%, and when only the first segment is activated, the
charge level is approximately 17%.
A pair of fully charged batteries in good condition provides enough power to
operate the Counter for approximately three hours at 25º C. Various conditions,
such as ambient temperature and the measurement configuration, can affect the
length of time the Counter can operate from a fully charged set of batteries.
A battery that reads approximately 13.6 VDC when measured with a voltmeter (or
the Battery Voltage reading in the menu display) is fully charged. A battery that
reads 11 VDC or less is at or near the minimum effective charge level.
Battery Charge Indicator
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