YOKOGAWA CW140, User Manual, Page: 38 / 292

IM CW140-E
3-16
3.6 Connecting a Power Supply and Turning It On/Off
TIP
• The CW140 is in a wait-for-recharge state when the LED indicator is flashing slowly (lit for approxi-
mately one second when on). The meter falls into this state when:
• the ambient temperature is outside the range from 10°C to 35°C;
• the battery performance is remarkably low due to over-discharge or for other reasons; or
• the NiMH battery pack is not installed yet.
• The LED indicator flashes rapidly if:
• the battery temperature rises above 55°C, or
• the ambient temperature changes drastically,
indicating that the battery pack has been recharged to its full level.
However in practice, the battery pack may not have been recharged completely for some reason.
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Indication that Recharge Is Required
NOTE
• If the voltage of the NiMH battery pack falls below a given level, the mark appears in the
upper-right corner of the display (low-battery state). If you continue to operate the CW140 in
this state, the meter automatically turns off.
• If the low-battery mark appears during measurement, change the power supply to an AC source.
Wait until the CW140 finishes or aborts measurement and therefore is ready for shutdown,
before replacing the batteries with new ones.
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Operating Hours of NiMH Battery Pack
The operating hours of an NiMH battery pack vary depending on its operating
environment and conditions. Refer to the following table.
Operating Hours: Approx. 7 hours
Operating Conditions: The LCD backlight is turned off and no floppy drive is connected.
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Service Life of NiMH Battery Pack
The NiMH battery pack can be recharged approximately 300 times, though
the frequency depends on its operating environment. The life of the battery
pack is over if the low-battery mark appears soon after the battery pack has
been fully recharged. Replace the battery pack with a new one.