3-4 TS-5020 Automotive Electronics Functional Test System Wiring Guide and Hardware Reference
3 System Overview
Test Capabilities – Measurement Sample Methods
The following test capabilities calculations help you determine
if the Keysight TS-5020 Test System can meet your Electronic
Control Module (ECM) test requirements. The test capabilities
of the Keysight TS-5020 system include the specifications of the
individual instruments used in the test(s) combined with the
offsets in the system environment due to the measurement
paths. The largest contributors to measurement variations are
the instruments and the relays in the paths. The process for
determining system capabilities is:
• Determine the accuracy required to test the ECM. For example, a
particular output driver test measurement requires a measurement
of 12.5 volts ±10 mV.
• Determine the path, including the number of relays, to the DUT
from the based DMM.
• Determine the specification of the instrument from the module
manual specifications section for the particular range which will be
used for the test.
• Calculate the sum of the accuracy uncertainty due to instrument
modules' specifications and system switch paths, and compare it
to accuracy required by the DUT.
System Capability DC Accuracy Sample
relay in the measurement path needs to be included in the algorithm for
calculating the system-level capability. The source voltage of 12.5 volts
is supplied by Power Supply. The 1-year Accuracy vs. Aperture (±(% of
reading + volts)) specification of the Keysight 34980A internal DMM
for dc voltage on the 100-volt range for 16.7/20 milliseconds is
0.0045% + 0.6 millivolt.
The relays for the measurement system route through the 34933 matrix
card, and are all the specified at 50 microvolts offset.
The calculated system capability (accuracy) on the 100-volt range, using
16.7/20 millisecond aperture range, when using the Keysight 34980A
internal DMM within its defined accuracy conditions is:
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