Anritsu 681XXC - Manual (Page 226)

681XXC OM A-3
AUX I/O: 25-pin connector that provides for single cable interface with another 68XXXB/C (master-slave
operation) and with other Anritsu instruments such as the Anritsu 56100A Scalar Network Analyzer. A
pinout diagram for this connector is shown in Figure A-2.
HORIZ OUT: Provides a 0V to 10V ramp during all sweep modes, regardless of sweep width. In the CW
mode, provides a voltage between 0V and 10V proportional to the full frequency range of the instrument.
When the CW Ramp is enabled, connector provides a repetitive 0V to 10V ramp. BNC connector, 50
W
impedance.
10 MHz REF IN: Accepts an external 10 MHz
±
100 Hz, 0 to 10 dBm time-base signal. Automatically
disconnects the internal high-stability, time-base option, if installed. BNC connector, 50
W
impedance.
10 MHz REF OUT: Provides a 0.5 Vp-p, AC coupled, 10 MHz signal derived from the internal frequency
standard of the signal generator. BNC connector, 50
W impedance.
AM IN: Accepts an external modulating signal to produce AM on the RF output. AM sensitivity (linear or
log) and input impedance (50
W
or 600
W
) are selectable via front panel menu or GPIB. BNC connector.
FM IN: Accepts an external modulating signal to produce FM on the RF output. FM sensitivity and input
impedance (50
W
or 600
W
) are selectable via front panel menu or GPIB. BNC connector.
IN: Accepts an external TTL level signal to square wave (pulse) modulate the RF output. BNC
connector.
EXT ALC IN: Provides for leveling the RF output signal externally with either a remote detector or a
power meter. Connector accepts a positive or negative 0.5—500 mV signal from a remote detector or a
±
1V signal from a remote power meter. BNC connector.
Line Fuse: Provides over-voltage/current protection for signal generator circuits during operation and
standby. Unit requires a 5A, type T fuse for 110 Vac line voltage or a 2.5A, type T fuse for 220 Vac line
voltage.
LINE SELECT Switch: Provides selection of 110 or 220 Vac line voltages. When 110 Vac is selected, the
681XXC accepts 90-132 Vac, 48-440 Hz line voltage; when 220 Vac is selected, the 681XXC accepts
180-264 Vac, 48-440 Hz line voltage.
Input Line Voltage Receptacle: Provides for connecting line voltage to the 681XXC signal generator.
IEEE-488 GPIB: 24-pin connector that provides for remotely controlling the signal generator from an
external controller via the IEEE-488 bus (GPIB). A pinout diagram for this connector is shown in Figure
A-3.
SERIAL I/O: Provides access to two RS-232 terminal ports to support service and calibration functions
and master-slave operations. RJ45 connector.
Figure A-1. Rear Panel, Series 681XXC Synthesized Signal Generator (2 of 2)
REAR PANEL
CONNECTORS
10
11
12
9
8
7
13
1
2
3
4
5
6