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681XXC OM A-5
PIN SIGNAL NAME SIGNAL DESCRIPTION
14 V/GHz
V/GHz Output: Provides a reference voltage relative to the RF output frequency
(1.0 V/GHz for Models 68117C, 68137C, and 68147C; 0.5 V/GHz for Model
68167C; 0.25V/GHz for Models 68177C, 68187C, and 68197C).
15 EOS INPUT
End-of-Sweep Input: Accepts a TTL high-level signal to tell the signal generator
to begin the end of sweep dwell.
16 EOS OUTPUT
End-of-Sweep Output: Provides a TTL high-level signal when the signal genera
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tor has begun the end of sweep dwell.
17 AUX 1 Aux 1: Auxiliary input/output to the processor (PB6).
18 SWP DWELL IN
Sweep Dwell Input: Permits a TTL low-level signal to stop the sweep in both ana
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log- and step-sweep modes. The sweep resumes when the signal is removed.
19 AUX 2 Aux 2: Auxiliary input/output to the processor (PC3).
20 BANDSWITCH BLANK
Bandswitch Blanking Output: Provides a +5V or –5V signal coincident with band
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switching points. Signal polarity is selected from a front panel menu.
21 SPARE
22 HORIZ IN
Horizontal Sweep Input: Accepts a 0V to 10V external sweep ramp from a Master
signal generator. This input is automatically selected when the signal generator is
in the Slave Mode.
23 Return Horizontal Sweep Input return.
24 TXb TXb: Serial Data Output from the processor.
25 MEMORY SEQ
Memory Sequencing Input: Accepts a TTL low-level signal to sequence through
nine stored, front panel setups.
Figure A-2. Pinout Diagram, AUX I/O Connector (2 of 2)
REAR PANEL CONNECTOR
CONNECTORS PINOUT DIAGRAMS