
ET User’s Guide
7-5
Front/Rear Panel
Connectors
EXT TRIG
IN/OUT
This rear panel female BNC connector allows
triggering of a analyzer sweep by an external signal.
When the external signal is pulled to a high TTL level,
the analyzer is triggered to do either one complete
sweep, or sweep to the next (frequency) point. (The type
of sweep that gets triggered is determined by the
softkey selection made under the Trigger Source
menu.) When the external signal is pulled to ground,
triggering is inhibited. This connector also acts as an
output: during a sweep, the analyzer pulses a low TTL
level each time a (frequency) point is measured. This is
an open-collector signal which you can drive low, but
must not drive high, since the analyzer also drives it.
LIMIT TEST
TTL IN/OUT
This rear panel female BNC connector provides a
bi-directional open-collector TTL high signal. The
output goes high when the limit test passes. The output
goes low if the limit test fails. This is an open-collector
signal which you can drive low, but must not drive
high, since the analyzer also drives it.
NOTE
Limit testing can be set independently on each of the two measurement
channels. If both measurement channels are being used, and the limit
test is ON for both channels, both measurement channels must pass for
the output to go high. See the following table.
Summary of Contents for HP 8712ET
Page 8: ...viii ET User s Guide ...
Page 17: ...ET User s Guide 1 1 1 Installing the Analyzer ...
Page 34: ...1 18 ET User s Guide Installing the Analyzer Preventive Maintenance ...
Page 35: ...ET User s Guide 2 1 2 Getting Started ...
Page 52: ...2 18 ET User s Guide Getting Started Performing the Operator s Check ...
Page 53: ...ET User s Guide 3 1 3 Making Measurements ...
Page 118: ...3 66 ET User s Guide Making Measurements Measuring Impedance Magnitude ...
Page 119: ...ET User s Guide 4 1 4 Using Instrument Functions ...
Page 143: ...ET User s Guide 4 25 Using Instrument Functions Using Markers Figure 4 15 Delta Marker Mode ...
Page 149: ...ET User s Guide 4 31 Using Instrument Functions Using Limit Testing Figure 4 16 Limit Lines ...
Page 207: ...ET User s Guide 5 1 5 Optimizing Measurements ...
Page 226: ...5 20 ET User s Guide Optimizing Measurements Measuring Devices with Long Electrical Delay ...
Page 227: ...ET User s Guide 6 1 6 Calibrating for Increased Measurement Accuracy ...
Page 266: ...6 40 ET User s Guide Calibrating for Increased Measurement Accuracy Checking the Calibration ...
Page 267: ...ET User s Guide 7 1 7 Front Rear Panel ...
Page 292: ...7 26 ET User s Guide Front Rear Panel Line Module ...
Page 293: ...ET User s Guide 8 1 8 Hardkey Softkey Reference ...
Page 395: ...ET User s Guide 9 1 9 Specifications ...
Page 397: ...ET User s Guide 9 3 Specifications System Performance ...
Page 443: ...ET User s Guide 10 1 10 Safety and Regulatory Information ...
Page 449: ...ET User s Guide 10 7 Safety and Regulatory Information Regulatory Information ...
Page 450: ...10 8 ET User s Guide Safety and Regulatory Information Regulatory Information ...
Page 451: ...ET User s Guide 11 1 11 Factory Preset State and Memory Allocation ...