Time Electronics 1048 Voltage-Current-Loop Calibrator - Manual (Page 19)

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V1.2 30/12/10 P a g e | 19 1048 Technical Manual
7.5. Step Mode Calibration
1) a) Select ‘SRC’ on the Mode select switch.
b) Select 0.22 on range switch.
c) Select ‘Norm’ on output switch.
2) Enter the step mode by pressing the ‘Inc’ and ‘Dec’ buttons simultaneously. The
‘CONTINUITY’ legend will then show on the top of the right side of the display. Press the
‘DEC’ button twice. Note: Make sure that the unit was switched on with the ‘DEC’ button
held down.
3) Adjust P9 for 100.0 on the display.
4) Press ‘Inc’ 20 times until the display shows approximately 200. Adjust P2 for 200.0 on
the display.
This completes the ‘Step Mode’ calibration.
7.6. Current Shunt Calibration
1) a) Select normal mode operation by pressing the ‘Increment’ and ‘Decrement’ buttons
simultaneously. The ‘CONTINUITY’ legend will then show on the top of the right side
of the display
b) Select ‘SRC’ on the Mode select switch.
c) Select .22 on range switch.
d) Select ‘Norm’ on output switch.
e) Select ‘mA’ on the OFF/V/I switch.
2) Connect a precision DMM to the output terminal and set it to 30 or
100 mA DC current range.
3) Adjust the multi-turn control until the display shows 19.000 (use the INC/DEC buttons
for fine adjustment). Make sure the unit is in high resolution mode, i.e. 5 digit display. If
it has dropped back to low resolution (4 digit), move output switch to ‘Lo’ position and
then back to ‘Hi’.
4) Adjust P8 until DMM reads exactly 19.000 mA.
5) Select ‘2.2’ on the range switch, select 3 or 10 mA range on DMM.
6) Use similar procedure to 3) and 4) to calibrate at 1.9000 mA (P6)
7) Select ‘.22’ on the range switch. Select 0.3 or 1 mA on DMM and use similar procedure
to 3) & 4) to calibrate at 190.00 uA. (P4)
This completes the calibration of the ‘current shunts’.