HP 16501A LOGIC Bedienungsanleitung PDF herunterladen (Seite 104)

Try doing a full reset of the target system before beginning the

measurement.

Some preprocessor designs require a full reset to ensure correct

configuration.

Ensure that your target system meets the timing requirements of the

processor with the preprocessor probe installed.

See “Capacitive Loading” in this chapter. While preprocessor loading is slight,

pin protectors, extenders, and adapters may increase it to unacceptable

levels. If the target system design has poor timing margins, such loading may

cause incorrect processor functioning, giving erratic trace results.

Ensure that you have sufficient cooling for the preprocessor probe.

Current processors such as the i486, Pentium, and MC68040 generate

substantial heat. This is exacerbated by the active circuitry on the

preprocessor board. You should ensure that you have ambient temperature

conditions and airflow that meet or exceed the requirements of the

microprocessor manufacturer.

If You Have a Problem

Erratic trace measurements

5–8

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HP 16501A LOGIC Bedienungsanleitung Seite 104