Tektronix 1502C User Manual page 23

Operating Instructions
Low Temperature
Operation
1–4
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 ≥ +5° C for 24 hours.
When operating the 1502C in an environment below +10° C, a heater will
activate. The element is built into the LCD module and will heat the display to
permit normal operation. Depending on the surrounding temperature, it might
take up to 15 minutes to completely warm the crystals in the LCD. Once
warmed, the display will operate normally.
1502C MTDR User Manual