12-12 Service Guide
Theory of Operation 8719ET/20ET/22ET
Digital Control Theory 8719ES/20ES/22ES
RF Network Analyzers
• TEST SEQ. This outputs a TTL signal that can be programmed in a test sequence to be
high or low, or pulse (10 µ seconds) high or low at the end of a sweep for a robotic part
handler interface.
• LIMIT TEST. This outputs a TTL signal of the limit test results as follows:
— Pass: TTL high
— Fail: TTL low
• VGA OUTPUT. This provides a video output of the analyzer display that is capable of
being viewed on VGA monitor.
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