Quick Start
R&S
®
ESR
38
User 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
