1- 111
Making Measurements
Using Test Sequencing
Test Set Interconnect Control
Figure 1-81 Test Set Interconnect Pin Designations
Control of the external switch (8762B Option T24) can be done through the test set interface on the rear
panel of the analyzer.
Pin 22 (TTL 1) on the TEST SET-I/O INTERCONNECT connector is a TTL line that changes from TTL high to
TTL low when changing TTL I/O FWD from 7 to 6. Refer to
Figure 1-81. To change from 7 to 6, press the
following sequence:
• Press .
Changing the switch state back to the standard mode requires a 7 to be entered in the “TESTSET I/O
FWD.”
Pin 1 on the external switch must be grounded. It can be grounded to:
• the analyzer's chassis
• the front panel binder post
• the outer shell of the TEST SET-I/O INTERCONNECT connector
• a ground pin on the TEST SET-I/O INTERCONNECT connector (pin 7, 12 or 18). Refer to Figure 1-81.
Pin C (common) on the external switch (8762B Option T24) must be connected to the test set interface pin
14 (+22 volt line). Refer to
Figure 1-81.
Pin 2 on the external switch, connects to pin 22 (TTL 1) on the test set interface.
The TTL I/O can control both of the external RF switches. Both must be cascaded in parallel together.
Changing the TTL I/O FWD from 7 to 6 will change the external RF switch state. This changes the
measurement capability from the network analyzer to the external test measurement device. The TTL I/O
FWD when changed from 7 to 6 will reverse the process.
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