Time Electronics 1090 Portable Process Calibrator - Manual (Page 7)

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1090 Technical Manual P a g e | 7
3.3. Thermocouple Source
Select Source mode by pressing ‘SHIFT’ followed immediately by ‘SOURCE’ key. The
display will show,
Src 0.00mV
Thermocouple Selection
Select the type of thermocouple that you wish to simulate by pressing the SHIFT’ key
immediately followed by the thermocouple type.
e.g. SHIFT followed by ‘J’ to select type J. The unit will indicate type and temperature. The
display will show,
Src Ja xx.x o C
The ‘a’ following the J indicates that the unit is set for automatic cold junction compensation.
If cold junction compensation is not required see section 3.2 to enable/disable.
The display may be toggled to show in
o F or o C by pressing ‘SHIFT’ followed by the ‘ o C/ o F’
key.
Note: The actual output voltage in mV can be displayed by pressing and holding down the
‘ENTER’ key.
Connect the device to be calibrated to the unit’s output terminals using thermocouple or
compensating cable.
Temperature for a Type J T/C can now be simulated. Enter the desired output temperature
using the numbered keys and press ‘ENTER’ or by using the ‘up/down’ arrow keys.
Pressing the ‘ENTER’ key will momentarily display the equivalent source voltage.
For CJC operation see 3.1
3.4. RTD (PT100) Simulation Measure
When the unit is turned on it displays the software version number. It then enters its default
mode - Millivolt (mV) and displays,
Meas 0.00mV
Select the PRT by pressing the SHIFT’ key immediately followed by ‘PRT’
Meas Pt Over o C
[The word ‘Over’ indicates over range and is displayed when probe is not connected
(Terminals open circuit). The word ‘Under’ indicating under range is displayed when
terminals are short circuited].
The display may be changed to read in o F by pressing ‘SHIFT’ then the ‘ o C/ o F’ key.
For this mode connect a PT100 sensor to the unit’s OUTPUT terminals. The unit will
measure temperature. Pressing the ‘ENTER’ key will momentarily display the equivalent
ohms value.