©Isothermal Technology
Page 17 of 61
914 millisKanner manual Iss. 1.00
low-level signals, never use it to switch currents other than PRT/thermistor sense
currents or voltages above 60V.
The reference junction temperature is measured by a digital sensor and is only available
via the RS232 interface. If you wish to use internal reference junction compensation, you
will need to access the reference junction temperature via the RS232 interface using the
MEAS:RJC?
command (see section 8.2.6.16) or the
MILL:RJC:TEMP#?
command (see
section 8.2.6.14).
Make up your own (screened) cable to connect the five output terminals on the rear of
the millisKanner to your instrument. Select channels using the RS232 interface (see
section 8) or manually (see section 2.5).
If you are controlling the millisKanner using the RS232 interface and making voltage
measurements (for thermocouples), make two measurements with opposite polarity
(using
CLOS# POS
and
CLOS# NEG
commands) and calculate half the (signed) difference
between the measurements in order to eliminate the effect of thermal EMFs generated in
the connection between the millisKanner and the instrument. This uses the internal sense
reversal feature of the millisKanner to make the highest accuracy voltage measurement.
If you do not use this feature, or are controlling the millisKanner manually (see section
2.5) you should use good quality, low thermal EMF connectors to connect between the
millisKanner and the instrument. The following Multi Contact 4mm stackable plugs are
recommended for the connection to the millisKanner:
Colour Multi Contact Part
Number
Farnell Stock Code
Black
22.2643-21
1085430
Red
22.2643-22
1085431
Green
22.2643-25
1085432