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12. Safety and operating conditions
12.1 Operator safety
TO PROTECT AGAINST SHOCK HAZARDS TO OPERATORS,
datalogger inputs and outputs should not be connected to voltages of
more than 25V DC or RMS AC with respect to earth (ground) unless the
datalogger is inside a protected enclosure.
12.2 Squirrel safety
The following inputs are protected up to specific voltages:
Input type
Maximum voltage
Analogue
25
External trigger
6
Pulse
6
Event
5 (can be increased to 6V, see 5.8.1)
External Power Supply
14
DO NOT APPLY LARGER VOLTAGES OR THE SQUIRREL COULD BE
DAMAGED (unless the logger has been specifically designed to do
so).
12.3 Errors caused by ground connections
For voltage and current inputs only
. While a reading is being taken,
both input terminals are connected through a 1M
W
resistor network to the
datalogger ground. At all other times, both terminals are floating.
Datalogger ground may become connected to mains earth (ground), e.g
via a mains connected computer or an earthed power supply. If this
happens, measuring errors will be caused if either input terminal is at a
voltage of more than ± 15V with respect to datalogger ground. All other
inputs and outputs have one terminal permanently connected to the
datalogger ground.
12.4 Operating conditions
The datalogger can be used at temperatures between -30 and +65°C and
with relative humidity up to 95% (non-condensing). At ambient
temperatures below -5°C the display becomes progressively slower to
change, and may fade at temperatures below -30°C. However, this will not
affect any other functions of the datalogger; readings will be retained in
the memory and logging will continue.
If a datalogger is used in a low ambient temperature, internal
