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R&S
®
ESR
38User Manual 1175.7068.02 ─ 12
AUX PORT
The 9 pole SUB-D male connector provides control signals for controlling external devi-
ces. The voltage levels are of the TTL type (5 V).
Pin Signal Description
1 +5 V / max. 250 mA Supply voltage for external circuits
2 I/O Control Phase N
3 I/O Controls the 150 kHz highpass filter
4 I/O Controls Phase L3
5 I/O not used
6 I/O Controls Phase L1
7 I/O Controls Phase L2
8 GND Ground
9 READY FOR TRIGGER Signal indicating that the instrument is ready to
receive a trigger signal (Low active = 0 V)
Short-circuit hazard
Always observe the designated pin assignment. A short-circuit can damage the port.
3.1.2.2 Optional Rear Panel Connectors
OCXO option (R&S FSV-B4)
This option generates a very precise 10 MHz reference signal. If installed, this signal is
used as an internal reference. It can also be used to synchronize other connected devi-
ces via the REF OUT connector.
Warm-up time for OCXO
When the instrument is switched on, the OCXO requires an extended warm-up time
(see data sheet).
Front and Rear Panel View
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