Time Electronics 1077 Milliamp Transducer Simulator - Manual (Page 16)

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1077 Technical Manual P a g e | 16
6.4. Calibration
The 1077 is calibrated when it leaves the factory and should not require further adjustment
for at least 12 months unless the circuit module or any of the calibration determining
components have been changed.
Before attempting recalibration it is important to ensure that the correct equipment is
available.
Equipment Required:
1. D.C. voltage source power supply for 24V at 100mA.
2. Precision DMM (0.01%) with 100mA, 10mA and 1mA current ranges and 100 volt range.
A. Calibration of Current Source/Sink
Zero Adjustment
Note:
Check the battery conditions
before recalibration.
Turn the 1077 ON and select
‘Source’ mode with the function
switch.
Select 100mA range on the 1077
and set the digit switch to 0005.
Connect the output of the 1077 to
the DMM.
Select the 1mA range on the
DMM.
Turn the 1077 output ON and
adjust zero trimmer to give 50uA
reading on the DMM.
10mA Range F.S.D Adjustments
Select 10mA range on DMM.
Select 10mA range on 1077 and the digit switch set to 9999.
Adjust VR2 (10mA trimmer) to bring within required accuracy.
1mA Range F.S.D. Adjustments
Select 1mA range on DMM.
Select 1mA range on 1077.
Adjust VR4 (1mA trimmer) to bring within required accuracy.
100mA Range F.S.D. Adjustments
Select 100mA range on DMM.
Select 100mA range on 1077 and the digit switch set to 9999.
Adjust VR3 (100mA trimmer) to bring within required accuracy.
B. Load Function Tests