Instrument Tour
R&S
®
FSWP
42
Getting Started 1177.5756.02 ─ 13
4.1.12
Noise Source Control
The female BNC connector labeled "Noise Source" allows you to connect and
control an external noise source, and supplies the required supply voltage.
You can use a noise source, for example, to measure the noise figure and gain of
amplifiers and frequency converting devices.
Conventional noise sources require a voltage of +28
V in order to be switched on
and 0
V to be switched off. The output supports a maximum load of 100 mA.
4.1.13
Trigger Input and Output
The female BNC connector labeled "Trigger Input / Output" allows you to receive
an external trigger signal or send a trigger signal to another device.
When you are using the connector as a trigger input, you can apply voltages in
the range from 0.5
V to 3.5
V (the default value is 1.4
V). The typical input impe-
dance is 10
k
Ω
.
When you are using the connector as a trigger output, the TTL compatible signal
is transmitted (0
V / 5
V).
Note that you can find another connector for trigger input and output on the rear
panel.
For more information about controlling and configuring trigger input and output,
refer to the User Manual.
4.1.14
Baseband Input
The two connectors labeled "Baseband Input 50
Ω
" are two female BNC connec-
tors that you can use to connect a DUT for Baseband Noise measurements.
When you perform measurements with two external mixers, the "Ch2" connector
is the IF input for the second mixer. This function is available with the optional
external mixer support.
The Front Panel
