Measurement Computing TempBook rev.4.0 - Manual (Page 25)

TempBook User’s Manual 04-25-01 Installation, Configuration, and Calibration 2-7
Calibration of TempBook
The TempBook/66 is factory calibrated for gain and offset. After calibration, gain and offset errors, and
software correction constants are calculated.
Calibration Constants File Installation
Each TempBook is shipped with a calibration constants file. The file is named serial_no.cal where
serial_no is the serial number of the TempBook for which the constants were generated.
The default calibration constants filename is tempbook.cal. Use Windows Explorer to copy serial_no.cal
from the disk to the following directory.
C:\PROGRAM FILES\DAQX\APPLICATIONS\TEMPBOOK.CAL\
Within DaqView, the user must go to Window/Preferences. Specify “Use Cal File” and browse to pick the
TEMPBOOK.CAL
file.
Next one should enable “Perform zero-offset adjustment” by checking the check box.
Reference Note:
Refer to the
DaqView document module for more information.
Hardware Calibration
Since the TempBook is factory calibrated, user recalibration is not recommended. One exception to this
recommendation is the calibration of the TempBook's internal 5V reference. This 5V reference is used to
level-shift the amplified analog input signal for unipolar measurements. Reference-voltage drift is not
compensated for with zero compensation; and therefore, periodic recalibration can improve unipolar
measurement accuracy.
The following characteristics can be calibrated through potentiometer adjustments on the TempBook main
board:
• 5V Reference Voltage
• Instrumentation Amplifier Offset
• Level Shift Amplifier Offset
• ADC Offset
• ADC Span
The TempBook includes a simple calibration program that can be used to perform these adjustments. If the
user is only performing the reference voltage adjustment, then only a 4-1/2 digit DMM is required. If the
user is performing the full TempBook calibration, then an adjustable voltage calibrator is also required.
A Microsoft Windows program, DAQCAL.EXE, is provided to perform calibration of the TempBook. To
use this program, install the TempBook Windows support and launch the DAQCAL program; follow the
on-screen instructions.