NARDA 8718B, User Manual

Page: 77 / 137

76 Operating the Meter
Battery Capacity
The Model 8718B Meter uses a custom rechargeable battery.
Under normal conditions, the battery provides about 20 hours of
use before it must be recharged. The two features on the 8718B
that significantly increase the current draw and therefore reduce
the operating time are the back light and the RS232 serial port.
It is for this reason that the default condition upon turn-on for
both these features is off . Operating time with the back light on
is about 6.5 hours. This is normally sufficient for a full day of
measurements but it is a factor that must be considered.
Checking Battery Status
To check the battery status...
1. Access the menu system by pressing the function key
that corresponds to the legend below MENU on the
bottom line of the display.
2. Press 4 to select BAT/LITE from the First Menu Screen .
A new screen will appear that indicates both battery
status and back light status.
3. The bar graph indicates the approximate charge level
of the battery. The charge level is also shown as a
numerical percentage on the left side of the third line of
the display.
The estimated operating time
under the current
operating conditions is shown on the left side of the
bottom line of the display. Turning the back light on,
for example, reduces the operating time significantly.
B A T T E R Y G H T
L E V E L = 9 0 % l I S O F F
T I M E = 1 8 H R S l O N O F F
F1 F2 F3 F4
l
L I