Applications 53
Using the Adjust Mode to Check Calibration
For this application the “Adjust” mode of operation is used to measure the error
of the equipment being tested. To test, simply set the calibrator to the required
output level and then adjust the output level until the equipment being calibrated
reads the correct value. The display of the calibrator will then show the actual
error of the unit. When one unit has been calibrated, remove the calibrator from
the “Adjust” mode. The output level will then revert to the nominal output level
in readiness for calibration of the next unit.
Calibrating Transducer Systems:
Connect the 2000 instrument in parallel with a 4 – 20mA or a 1 – 5V transducer
output to modify the transducer’s indicated output.
Adjusting Calibration of Multiple Units
The drive capabilities of the 2000 instruments are sufficient to adjust the calibra-
tion of multiple units of equipment simultaneously. In voltage mode this is
achieved by connecting all the units to be calibrated in parallel. 10 to 20 units can
be adjusted simultaneously at voltages above 220mV. At voltages below 220mV
the 50
output impedance of the 2000 instruments becomes significant.
If the units being adjusted have 10M
(or lower) input impedance then a correc-
tion has to be made for the output impedance of the 2000 instrument.
The output impedance of the 220mV range is
45.048
•
0.1%
The output impedance of the 22mV range is
49.998
•
0.1%
.
Thus the correction required to allow for the input impedance of the units
being adjusted is:
Correction = (Z
O
+ Z
IN
) / Z
IN
Where the required output voltage should be multiplied by Correction.
Z
O
is the actual output impedance of the 2000I or 2000M instrument.
Z
IN
is the combined input impedance of the instrument being adjusted.
The increase in the limits of error due to applying this correction
is:
Error = ( ( 1000 + EZ
IN
) * Z
O
) / Z
IN
Summary of Contents for Xitron 2000 Series
Page 1: ...USER GUIDE 2000 Family DC Temperature Source Instruments...
Page 2: ......
Page 18: ...2000I 2000M Instrument s User Guide Revision B 18...
Page 42: ...2000I 2000M Instrument s User Guide Revision B 42...
Page 47: ...Using the Memory Options 47...
Page 60: ...2000I 2000M Instrument s User Guide Revision B 60...
Page 91: ......
Page 92: ...2000I 2000M Instrument s User Guide Revision B 92...
Page 95: ...Appendix B General Specifications 95...
Page 97: ...Password Page 97...
