Battery Life - Fluke DATAPAQ Tracker XL2 User Manual

The logger will automatically come out of power-off mode when:
• The communications lead (which is connected to a powered PC) is plugged
in, or
• A Transducer Interface is connected to the MemoryPaq, or
• A hardware reset is performed (see below).
On power-up, the logger will return to its pre-power-off state.

Battery Life

Battery life (discharge time) of NiMH rechargeable batteries is affected by the
following factors.
• Operating Temperature – Essentially, the higher the ambient
temperature the battery operates in, the shorter will be the life. Batteries
that operate for a large part of the process cycle at relatively low
temperatures will have a longer life than those that operate for the majority
of the process cycle at the maximum operating temperature.
• Sample Interval – The shorter the sample interval, the shorter will be the
battery life. This is because power is being consumed each time the logger
takes a reading. A short sample interval will achieve the maximum amount
of information, but this must be balanced against the greater battery charge
required.
• Resetting the Logger, and Downloading Data – When these
operations are carried out it is necessary to connect the logger to the
computer via the communications lead, and power is consumed whenever
they are connected. The software warns the user to disconnect from the
PC when the operation is complete in order to preserve battery life.
Given the factors that can affect the life of a battery it is obviously difficult to
predict it accurately. The battery status LED on the logger (see above) will give
the best indication of when the battery is low. In the user's own conditions,
experience will quickly indicate typical battery life, and a log should be kept for
the first few runs, noting the sample interval. The following data can serve as a
guide – though values given here are no more than an indication of the battery
life that can be expected.
Sample Interval No. of Channels Logger Temp. Battery Life
0.5 s
5.0 s
20.0 s
OVEN TRACKER XL2
8 25°C/77°F
8 25°C/77°F
8 25°C/77°F
Logger Specifications and Operation
25 hrs
50 hrs
60 hrs
25