Rohde & Schwarz 1321.0615.02, User Manual

Page: 41 / 581

Getting Started
R&S
®
Spectrum Rider FPH
34 User Manual 1321.1011.02 ─ 11
When the BNC connector is configured as a trigger input, it controls the start of a mea-
surement. The trigger mode is selected in the "Sweep" menu, see
Chapter 3.2.5.5,
"Function Keys" , on page 46. The trigger threshold is similar to that of TTL signals.
When the BNC connector is configured as reference input, you can apply a 10 MHz
external reference signal to it for frequency synchronization. The external reference
label
is displayed at the top right corner of the trace window to indicate that the
reference signal is supplied via external signal input. The label turns green when the
reference signal is detected.
The level of the reference signal must be larger than 0 dBm. If there is no reference
signal present at the BNC connector, the R&S Spectrum Rider displays an appropriate
message. Thus, measurements without a valid reference can be avoided.
For more information on configuring the BNC connector for the appropriate signal, see
"Configuring the BNC connector" on page 53 and Chapter 3.2.7.3, "Using the GPS
Receiver" , on page 57.
3.2.2.3 Headphone Jack
The 3.5 mm connector for headphones is located on the top of the R&S Spectrum
Rider.
The internal impedance of the connector is approximately 10
Ω
.
3.2.2.4 USB Port
The two USB ports are located on top of the R&S Spectrum Rider.
You can use the USB interface to connect a memory stick and store data sets or
screenshots.
The USB connector can also be used to control the operation of the power sensor and
GPS receiver. See
Chapter 3.3.2, "Using a Power Sensor" , on page 84 and Chap-
ter 3.2.7.3, "Using the GPS Receiver" , on page 57.
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