Oxford Instruments Mercury iTC, Handbook

Page: 33 / 146

Handbook
November 2011 / 59-UMC0071 / Issue 01
Mercury iTC
Page 33
USER INTERFACE
Original Instructions

Excitation Magnitude
Tap once to display a numeric keypad.
If
Sensor Type is set to PTC , enter an excitation current in
μ
A.
If Sensor Type is set to Diode , enter an excitation current in
μ
A.
If Sensor Type is set to NTC , enter an excitation voltage in mV.
If Sensor Type is set to Thermocouple , this value is ignored.

Cal Adj button
This button is only active if the Calibration field is set to Generic . Tap once to access
the Generic Sensor Adjustment page (see Section 3.2.6.2 ). This allows the user to
adjust the scale and offset of a generic calibration curve to suit a particular sensor.

Calibrate button
Tap once to calibrate this measurement circuit. This routine takes approximately one
minute. An error message is generated if the calibration fails for any reason.
3.2.6.2 Generic Sensor Adjustment page
This page allows the user to adjust the calibration curve of a generic sensor. See
Section 5.4.2.2 for a detailed explanation of this process.
Figure 3-15 Generic Sensor Adjustment page
The page contains the following fields and controls:

Measured Parameter
Displays the measured sensor value (i.e. resistance or voltage).

Scaled Parameter
Displays the measured parameter value after the selected Scale and Offset have
been applied. If Scale = 1 and Offset = 0, Measured Parameter and Scaled
Parameter are identical.

Scale
Adjust to change the slope of the calibration curve.

Offset
Adjust to change the offset of the calibration curve.

Save
Tap to save the new Scale and Offset values.