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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
Programmable Channel Calibration 6-1
Chapter 6
Programmable Channel Calibration
This chapter provides calibration and verification information for the family of T940
Digital Resource modules which have channels with programmable
driver/receiver characteristics. The following table lists the calibration functions
and the DRM types that require the calibration:
Table 6-1: Calibration Functions and DRM Requirement
Calibration Function
DRM Types
ADC Reference (via EXTERNAL FORCE port)
DR3E, DR9, UR14
M ADC
DR3E, DR9, UR14, DR4
Source/Sink Load (via EXTERNAL FORCE port)
DR3E, DR9, UR14
Drive High and Drive Low
DR3E, DR9, UR14, DR4
Compare High and Compare Low
DR3E, DR9, UR14, DR4
V
commutating
(V
com
) High and Low
DR3E, DR9, UR14
Current Source and Sink
DR3E, DR9, UR14
Current Alarm High and Low
DR3E, DR9, UR14
Delete (Section two only)
DR3E, DR9, UR14, DR4
CAUTION
ALWAYS PERFORM DISASSEMBLY, REPAIR AND
CLEANING AT A STATIC SAFE WORKSTATION.
Performance Verification
Do not attempt to calibrate the instrument before verifying first that the instrument
is in working order. A complete set of specifications is listed in the Appendices. If
the instrument fails to perform within the specified limits, the instrument must be
tested to find the source of the problem.
If there is a reasonable suspicion that an electrical problem exists within the
T940 DRM, perform a complete self-test on the instrument prior to running a
verification or calibration procedure.