Measurement Computing Analyzer488 - Manual (Page 40)

Section 2 Getting Started
2.18
2.4.7 Time and Rate Measurements
The Analyzer488 provides statistics of time and rate measurements of
previous bus transactions. It reports the post-trigger time period, the
number of bus events that occured during that time period, and the
effective transfer rate.
When the Analyzer488 records bus transactions using triggering, it
measures the length of time between the trigger point and the last post-
count event recorded. This measurement is made with a resolution of two
microseconds (2 µsec).
The number of bytes recorded is divided by the post-trigger time
period the to calculate an effective transfer rate of bus transactions in bytes
per second.
2.4.8 Analyzing Bus Records
The record memory of the Analyzer488 contains information about
the state of the IEEE 488 bus for each bus event that occurred while
recording was enabled. For each event, the state of the bus management
lines and data lines is preserved. Also, status information is retained,
including whether the event data is valid, whether the event is a trigger
point, and if the event occurred during a bus error.
The Analyzer488 provides facilities for retrieving the bus records,
searching for specific bus records and assigning logical addresses to the
bus records. Part or all of the record memory may be printed using a serial
or IEEE 488 printer. Additionally, the Analyzer488 provides options for
erasing and resetting the record memory.
2.5 Rear Panel Description
The rear panel of the Analyzer488 gives access to bus signals and simple hook-
up to peripherals. The following connectors are provided and described below: