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 68137B, 68145B, and 68147B; 0.5 V/GHz for Models
68153B, 68155B, 68159B, 68163B, 68165B, and 68169B; 0.25V/GHz for Models
68175B, 68177B, 68185B, 68187B, 68195B, and 68197B).
15
EOS INPUT
End-of-Sweep Input: Accepts a TTL high-level signal to tell the sweep generator
to begin the end of sweep dwell.
16
EOS OUTPUT
End-of-Sweep Output: Provides a TTL high-level signal when the sweep
generator 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
analog- 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
bandswitching 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
sweep generator. This input is automatically selected when the sweep 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
681XXB OM
A-5
