LOCAL OPERATION
3-4
Rear-panel connectors
The rear-panel connectors are shown in Fig. 3-2 below.
INPUT FROM
RADIO TEST SET
AUXILIARY PORT
TRIGGER 1
EXT STD
I/P
GPIB 1
IEEE 488.2
RS232
INT STD
O/P
TRIGGER 2
1
2
3
4
7
5
6
8
9
C5818
POWER SUPPLY
100-240V~
50-60Hz
250VA MAX
FUSE RATING T4AL250V
Fig. 3-2 2026Q rear panel
1
EXT STD I/P
BNC connector for the input of an external standard frequency
of either 1 MHz or 10 MHz.
2
INT STD O/P
BNC connector for the output of the internal 10 MHz standard.
3
RS232
9-way RS-232 connector used for remote control of the
instrument as well as to reprogram the internal flash memory.
For contact allocation see ‘RS-232 connector’ in Chapter 2.
4
GPIB 1
24-pin socket accepts standard IEEE connector to allow remote
control of the instrument.
5
POWER SUPPLY
3-pin plug integral with fuse holder. Mates with AC supply
lead socket.
6
TRIGGER 1
BNC connector which is used for sweep triggering.
7
TRIGGER 2
Reserved.
8
AUXILIARY PORT
25-pin socket. Can accept external data to modulate each of the
internal sources for 2-level or 4-level FSK. For contact
allocation see ‘Auxiliary port connector’ in Chapter 2.
9
INPUT FROM
RADIO TEST SET
50
Ω
SMA connector. Enables a signal to be fed into the
combiner from a radio test set or an external signal generator.
