MagTek InSpec 9000 - Manual (Page 47)

Section 4. Graphics Presentations
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Trends to observe and report are when the bars begin to drift up or down. When this occurs, the
technician may want to investigate the process for encoding the card stock, the encoder, or may
send the card or cards to a test laboratory for analysis. Cleaning and calibration of the Tester
may be in order. Figure 4-6 shows an example of card amplitude drifting up and down. Note
that the last few bars extend above the 136% maximum. This shows that some of the cards are
out of the ISO limits for new (Unused) and used (Returned) cards, but most are within limits for
both.
Figure 4-6. Performance - Amplitude
The operator should report this trend before the card extends to the limit for new cards. A graph
and print should be made of this trend. Some variations in amplitude are to be expected.
Another indication of problems is erratic changes in parameters, where a bar may be at or close
to the upper limit, and the next bar may be at or close to the lower limit. This may indicate
problems with card stock or the Encoder.