Omega OMB-DAQ-54 User Manual page 110

19. If your Personal Daq is connected to an expansion module:
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Note: For step 20, it is recommended that you make a simple harness from a DB25 male connector to
avoid damaging Personal Daq's expansion connector. A properly made harness will also ensure
good pin contact. (See following figure).
20. Connect the multimeter positive lead to pin number 24 and the negative lead to pin number 13
(note the harness in the preceding figure). Measure the reference voltage at Personal Daq's
expansion port, and note the value for use in the following step.
21. Using the keypad of your PC or laptop, enter the reference value obtained from step 20. Select
"Next." UserCal now calculates calibration constants and stores them in Personal Daq's serial
EEPROM. UserCal displays a brief calibration report.
Personal Daq User's Manual
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remove the USB cable from the Personal Daq main unit
if used in your application, remove the external power cable from the Personal Daq main unit
carefully remove the retaining clips from the Personal Daq modules
remove the expansion module from the main unit
if a power adapter was used, reconnect the adapter cable to the Personal Daq main unit
reconnect the USB cable to Personal Daq main unit
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Calibration 6-5