Fluke COMARK BT42 Mode D'emploi page 6

Operation
Connecting Probes to the
Thermometers
BT40 series thermometers have either
sub-miniature or Lumberg sockets for
probe connection and offer a class
leading choice between Comark
thermistor, type T thermocouple or type K
thermocouple probes.
The polarity of the connector must
always be checked before connecting
thermocouple probes to BT40 series
thermometers. A probe of the correct
thermocouple type must also be selected
to match the specific thermometer. BT40
series thermometers with Lumberg
sockets will automatically detect the
sensor type of the probe connected. The
LCD will then indicate thermistor probes
as "PST", and type T thermocouple
probes as "T". Models with Sub-Min
connector are of fixed thermocouple type,
see specifications for details
Switching On and Off
Press and hold the "HOLD" button on the
keypad to switch the thermometer on.
After a short pause, the display will show
the current model of the instrument and
will then revert to normal temperature
display. The current time is also
permanently displayed on the LCD. To
switch off is a long press on the "HOLD"
button.
Data Hold
All BT40 series thermometers have a
data hold facility. If the "HOLD"
button is pressed at any time during
normal temperature mode, the current
temperature will be held on the display. To
release press "HOLD".