© Isothermal Technology
Page 19 of 102
923 milliK manual - issue: 1.10
3.1.1 Configuring milliK to measure a PRT/SPRT
Press the
Settings
(F3) key to access the
Settings
Window, which opens with the
‘Channel’ parameter selected. Use the
←
←
←
←
→
→
→
→
keys to select the channel that you want to
configure. Then use the
↑
↑
↑
↑
↓
↓
↓
↓
keys to select each parameter in turn and set it to the required
value either by using the
←
←
←
←
→
→
→
→
keys to sequence through the options or pressing the
↵
↵
↵
↵
key to
open a new Window with all the options listed. A typical configuration for an uncalibrated
PRT would be:
‘Range’ would normally be set to 460
Ω
for a 100
Ω
PRT and to 115
Ω
for a 25.5
Ω
SPRT
(see section 3.1). Most PRT/SPRT measurements are made with a 1mA sense current, but
this can be increased to 1.428mA in order to determine the self heating effect (see section
3.1.2). The ‘Samples/Reading’ setting is the number of samples averaged together to form a
single reading. Increasing this value will reduce the noise on the measurements (standard
deviation will reduce as the square root of the number of samples) but also slows down the
update rate.
Higher accuracy measurements can be made using calibrated PRTs/SPRTs whose resistance-
temperature characteristics have been determined. Before being used, the thermometer and its
calibration details must be entered into the milliK’s thermometer database (see section 3.9.1).
The thermometer will then appear in the ‘Thermometer’ list. Use the
←
←
←
←
→
→
→
→
keys to sequence
through the thermometers or press the
↵
↵
↵
↵
key to open a new Window with all thermometers
listed:
