PicoLog Self-Help Guide
AR346-1
© Copyright 2014 Pico Technology Ltd.
18/34
Assuming you just have data for the thermocouple for a two-point calibration (indicated
and true readings for two different temperatures), then type into the text box the two
pairs of numbers:-
aa bb
cc dd
where:
aa = the indicated reading at the first temperature
bb = the true reading at the first temperature
cc = the indicated reading at the second temperature
dd = the true reading at the second temperature
(taken from your calibration certificate for the thermocouple or your own measurements)
Note that there is one space between the two numbers on each line.
The actual table will look similar to this:-
9.5 10.1
94.5 95.0
This example tells the program to equate 9.5°C indicated reading to a true 10 °C and
94.5 °C indicated reading to a true 95 °C.
When the scaling is applied, the readings will be corrected.
Click OK to go back through the open boxes and temperature should now be scaled
correctly.
(Note:- Lookup tables have a limit of 14 lines. Above that, use a Scaling File.)
If you use a scaling file you must ensure that either:-
1. All parameter formatting is done on the parameter formatting page only and none in
the scaling file (just the equation or lookup table).
or
2. Parameter formatting is NOT ticked and all formatting is done in the scaling file only.
Duplication of parameter formatting will cause a crash!
When all channels are done, save a settings (.pls) file and next time, when you want to
reapply the same calibration to a logging session, just start PicoLog by double-clicking
the settings file instead of the PicoLog icon.
4–20 mA on the TC-08 using the Single-Channel Terminal Board
Here are some standard instructions for this sort of scaling of a 4–20 mA sensor to the
TC-08:-
The sensor will require a +24V supply. Feed the positive of the supply to the positive of
the sensor. Feed the negative of the sensor to the +5V/4-20mA input of the single
