Time Electronics 1090 Portable Process Calibrator - Manual (Page 6)

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1090 Technical Manual P a g e | 6
3.
Operating Ins truction
3.1. Turning the unit On/Off
To Turn On
The unit is powered up by pressing and holding any key for longer than 1 second. On
power-up, the software version and (mV/mA/Pt) will be displayed for 2 seconds. The battery
voltage is then checked and if below 6.5V a ‘Battery Low’ warning is displayed.
If below 6.0V a ‘Battery Dead’ warning appears and the unit powers down.
The unit then goes into its default start mode, Measure mV
To Turn off
The unit is powered down by pressing ‘SHIFT’ followed by ‘OFF’ key.
Cold Junction Temperature Compensation
Automatic or Manual Cold Junction Temperature Compensation may be applied. On power
up the unit defaults to Auto CJ status.
To change to Manual press the ‘MENU’ key followed by the up and down arrows until the
display indicates step:
3) CJ Auto xxx o C
Press the ‘ENTER’ key. The unit switches to manual and is ready to accept a manual figure
entered from the number keys. The unit remains in the CJ Manual mode until it is turned off.
Note: Setting Cold Junction Compensation in degF requires the unit to be in degF units
before entering the menu.
3.2. Thermocouple Measures
When the unit is turned on it displays the software version number and then enters its
default mode (mV measure) and displays
Meas 0.00mV
Connecting the Thermocouple
Connect the thermocouple cable or compensating cable to the 1090’s input terminals.
Thermocouple Selection
Select the type of thermocouple that you wish to measure by pressing the SHIFT’ key
immediately followed by the thermocouple type. e.g. SHIFT then J to select type J. The unit
will indicate type and temperature. The display will then show:
Meas Ja 23.9 o C
The ‘a’ following the J indicates that the unit is set for automatic cold junction compensation.
If automatic cold junction compensation is not required, it should be disabled using the menu
set-up. See section 3.1.
The display may be toggled to show in degF or degC by pressing ‘SHIFT’ then the ‘
o
C/
o
F’ key.
Note: If required, the actual thermocouple output voltage in mV can be shown by pressing
and holding down the ‘ENTER’ key.
For CJC operation see 3.1