R&S FSH3 Putting into Operation
Spectrum Analyzer Connectors
The R&S FSH3 has the following connectors:
RF input
Connect the RF input via a cable with an N connector to the DUT. Make sure it is not overloaded.
The maximum permissible continuous power at the RF input is 20 dBm (100 mW). It can be loaded with
up to 30 dBm (1 W) for at most three minutes. If the instrument is loaded with 1 W for longer, it heats up
to such an extent that it may be destroyed.
Caution!
The RF input is AC-coupled. However, the DC input voltage must never exceed the value
specified on the housing; otherwise the coupling capacitor at the input may be destroyed
and consequently the input attenuator or mixer too. The RF input is protected from static
discharges and voltage pulses by a combination of limiting circuits and high-voltage
arresters.
Input for external trigger or external reference (EXT TRIG/EXT REF)
Via the EXT TRIG/EXT REF BNC connector, either an external trigger signal is applied to start a
measurement, or a 10 MHz reference signal is applied for frequency synchronization. The trigger
threshold is similar to that of TTL signals. The level of the reference signal must exceed 0 dBm.
Switchover between external trigger input and reference input is via the SETUP key.
DC connector for external power supply (on the right-hand side of the carrying handle).
The R&S FSH3 is powered from the AC/DC adapter via the DC connector and the R&S FSH3 internal
battery is also charged. The input voltage for the instrument must be between 15 V and 20 V. Power
consumption is approx. 7 W.
The battery can also be charged from a cigarette lighter socket in a vehicle. The adapter is available as
an R&S FSH3 accessory (R&S FSH-Z21, Order No. 1145.5873.02).
Caution!
While the battery of the R&S FSH3 is being charged via the 12 V Car Adapter
R&S FSH-Z21, the latter must not under any circumstances be connected to the vehicle's
ground (for example, via the R&S FSH3's RF connector or the power sensor).
Headphones connector (on the left-hand side of the carrying handle).
A 3.5 mm jack is provided for headphones. The internal impedance of the connector is approx. 10 Ω.
RS232 optical interface
(on the right-hand side of the R&S FSH3, can be accessed by folding out support).
The RS232 optical interface is for connecting a printer or PC. The RS232 Optical Interface Cable
R&S FSH-Z34 (supplied with the R&S FSH3) is used to make the connection. The optical connection
prevents spurious measurements being caused by interference from these devices.
Use the Serial/Parallel Converter R&S FSH-Z22 for printers with a parallel interface.
Connector for power sensor
The connector has been especially configured for R&S power sensors. The connector is used to power
the sensor and to transfer data via the power sensor’s interface. If the R&S FSH-Z2 (VSWR bridge and
power divider) is used, it is controlled by the connector.
1145.5973.12 1.5 E-6
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