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Model T940 User Manual
Publication No. 980938 Rev. K
Programmable Channel Calibration 6-4
Astronics Test Systems
example, can create a higher operating temperature. For best accuracy, run the
Soft Front Panel during a typical test execution and monitor the programmable
channel temperatures on DRB (if installed, otherwise on DRA). The module
should settle on a temperature if the test is long enough to establish equilibrium.
The highest of these temperatures should be used as the calibration temperature
for best accuracy in similar applications.
Calibration Procedures
Use the following procedures to calibrate the T940 Digital Resource module.
Calibration is done with the covers closed and the T940 module installed in a VXI
chassis. The calibration procedure requires that the T940 Soft Front Panel utility
program be installed and interfaced to the instrument. The VISA library is
required.
Calibration is performed from the Calibration Panel in the T940 Soft Front Panel.
To invoke this panel, access the Calibrate menu item from the Instrument menu
as shown in Figure 6-1.
Figure 6-1: Invoke the Calibrate DRM Panel from the SFP
In addition, be sure to select the Voltage Range mode which is required by the
application as there are 7 ranges to choose from and two voltage modes.
Calibrating in a Voltage Mode range that is different from the range used in the
application can cause a reduction in measurement accuracy.
Note
: Calibration procedures must be performed in the order shown below.
Changing the order of calibration from that which is shown in the procedure can
invalidate the results.
The Calibrate panel, before opening, will inform the user that calibration mode
requires the instrument to be automatically reset to its power-on defaults. If the
instrument settings need to be saved prior to calibration, or if the instrument is