Time Electronics 1090 Portable Process Calibrator - Manual (Page 9)

9
1090 Technical Manual P a g e | 9
3.9. mA Source and 24V Process Loop Drive
To select Source mode press ‘SHIFT’ followed immediately by ‘Source’
Scr 0.000mV
To select mA Source mode press ‘SHIFT’ followed immediately by ‘mA’
Src 0.000mA
Connect the device to be calibrated to the unit’s output terminals
Enter the desired mA values using the numbered keys or ‘Up/Down’ arrow keys.
It should be noted that the unit can provide a maximum output of 80mA. The user should be
aware that continuous operation at this level will reduce the battery life considerably.
24V process loop drive
It is possible to use the unit to drive conventional process loops with 24V dc and up to
60mA.
Select mA Source mode as described above. Set the current output to 60mA (or less if
required). The output terminals will then provide 24V (+/- 0.5V) to drive the loop. It will allow
up to the set value of current to be supplied before the output voltage will drop.
3.10. Storing and Recalling Values
In the source mode the 1090 unit is able to store and recall up to ten output values. The
values may be stored in locations 0 to 9).
The values may be recalled manually or automatically.
Used in conjunction with the ‘Auto Step’ function the unit may be programmed to output the
stored values in sequence pausing at each value. The pause (wait-time) is adjustable.
To store values in memory first the unit has to be in the Source mode. Select the source mode by
pressing ‘SHIFT’ followed immediately by ‘Source’
Src 0.000mV
Select the required type of source units (Thermocouple, RTD, uV or mA).
e.g. For mA press ‘SHIFT’ immediately followed by ‘mA’
**** Src 0.000mA ****
Entering and storing values
Select ‘SOURCE’ mode followed by the required parameter i.e. thermocouple type, uV, mV,
or mA. Please note that Store/Recall is not available for PRT ( you just step through the
fixed values using the up/down arrows for this parameter)
1. Enter the required value for the selected parameter followed by the ’ENTER’ key.
2. Press ‘SHIFT’ followed by ‘STORE’ the display will show,
Store 0-9 >
3. Enter the required store location number, i.e. 0 - 9.
Repeat steps 1 to 3 for up to a maximum of ten store locations.