Service manual

PN 4237242C
7.2-2
TROUBLESHOOTING
GENERATING A SERVICE REPORT
Figure 7.2-2 Sample Printed Report
AIM Criteria Results
During data accumulation, pulses are edited so that only good pulses are used to produce
histograms. One output of the Editor circuit is the 26-percentile voltage. This voltage is a
pulse width parameter that is representative of the travel time or flow through the aperture.
An average 26-percentile voltage is measured for each of the 12 count periods that make up
the instrument's data accumulation. This data is used along with the parameter data to
determine abnormal aperture events, specifically clogs or partial clogs. A description of each
line item follows. Specific values are not given for the acceptable ranges since they are subject
to change with software revisions. Use the ranges given on the Service Report of the
instrument you are troubleshooting.
Target (T): The expected 26-percentile voltage for most samples on a given instrument. The
procedure to set target values can be found in Heading 4.28, AIM ADJUSTMENT.
Measured: The average 26-percentile voltage for the entire data accumulation. The acceptable
limits are given on the report as a fraction or percentage of the instrument’s target: example
0.935T is 0.935 times the target value or 6.5% below the target value.
CV: The CV of the 12 count period, 26-percentile results.
Ratio: The ratio of good pulses (or pulses that are accepted by the Editor circuit) to all pulses
counted.
7242044A