Operating Instructions
1503C MTDR User Manual
1–3
CAUTION.
Do not charge battery pack below 0
°
C or above +40
°
C. Do not
discharge battery pack below –10
°
C or above +55
°
C. If removing the battery pack
during or after exposure to these extreme conditions, turn the instrument off and
remove the AC power cord.
The battery pack should be stored within a temperature range of –35
°
C to +65
°
C.
However, the self-discharge rate will increase as the temperature increases.
If the instrument is stored with the battery pack installed, the battery pack should
be charged every 90 days. A fully charged battery pack will lose about 12% of its
capacity in three to four months if stored b20
°
C and +25
°
C.
If the battery is low, it will be indicated on the LCD (bat/low). If this is the case,
protective circuitry will shut down the 1503C within minutes. Either switch to AC
power or work very fast. If the instrument is equipped with a chart recorder, using
the recorder will further reduce the battery level, or the added load might shut down
the instrument.
O
F
F
O
F
F
O
F
F
O
N
1 avg
0.00 dB
5000 ft
bat/low
0.00 ft
50 W
2 ns
Low Battery
Indicator
Figure 1–2: Display Showing Low Battery Indication
Protection circuits in the charger prevent deep discharge of the batteries during
instrument operation. The circuits automatically shut down the instrument
whenever battery voltage falls below approximately 10 V. If shutdown occurs, the
batteries should be fully recharged before further use.
NOTE
. Turn the POWER switch off after instrument shutdown to prevent continued
discharge of the batteries.
When the instrument is stored at temperatures below –10
°
C, voids might develop
in the liquid crystal display (LCD). These voids should disappear if the instrument
is placed in an ambient temperature
w
+5
°
C for 24 hours.
Low Battery
Low Temperature
Operation
Summary of Contents for 1503C
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Page 92: ...Appendix A Specifications A 6 1503C MTDR User Manual...
Page 104: ...Appendis B Operator Performance Checks B 12 1503C MTDR User Manual...
Page 122: ...Glossary Glossary 6 1503C MTDR User Manual...
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