R&S FSH
Putting into Operation
1145.5973.12 1.5
E-11
Spectrum Analyzer Connectors
The R&S FSH has the following connectors:
RF input
Connect the RF input via a cable with an N connector to the DUT. Make sure that 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 a maximum of 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, thus, the input attenuator or mixer as well. 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 for the reference signal must be greater than
10 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 DC connector is used to supply the R&S FSH with power from the AC/DC adapter and to charge
the R&S FSH internal battery. 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 FSH accessory (R&S FSH-Z21, order no. 1145.5873.02).
Caution!
While the battery of the R&S FSH is being charged via the 12 V Car Adapter
R&S FSH-Z21, the car adapter must not be connected to the vehicle's ground (for
example, via the R&S
FSH's RF connector or the power sensor) under any
circumstances.
Headphones connector
(n 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
.
