User manual

19
Subject to change without notice
Controls and Elements
10
Transient Limiter selector switch
After power-on the transient limiter circuit is enabled
by default, to protect the attached test receiver’s or
spectrum analyzer’s input circuitry from high transi-
ent voltages. After pushing button
10
the transient
limiter circuit will be bypassed. A blinking red LED
12
indicates this operating status.
11
Test Receiver (test signal output)
The output impedance Z of the HM6050-2’s test
signal output is 50Ω. The shielding connection of the
BNC jack is connected to the housing and thus to
ground. A two plug broadband BNC cable is used to
attach the HM6050-2 to a test receiver or spectrum
analyzer. The built-in transient limiter is enabled by
default. Pushing button
10
provides deactivation;
LED
12
indicates this status by blinking.
13
RM - LED
In remote control mode „RM“ LED is activated.
Because of their test principles test receivers
and spectrum analyzers are extremely sensitive
at their input circuitry. To protect the input cir-
cuits from damage by high voltage transients,
it is highly recommended to use the equipment
with the transient limiter enabled (red LED off)!
Due to switching the DUT on and off, transients
might arise, that possibly can damage the input
circuit of the spectrum analyzer or test receiver.
Damages of the input circuitry resulting from
transient voltages are not covered by warranty.
1514 16
4.2 Rear panel
14
AC power cable
The power cable is used to attach the HM6050-2
to the mains outlet (see: “Setting into operation”).
15
Ground block
The ground block is made of aluminum and fastened
to the backside of the housing by two screws (below
the mains cable outlet). Terminal “PE” may not be
used as reference ground because it is connected
to the PE line of the mains cable via a lter. If tests
are performed outside an EMC chamber only a
short ground cable may be used. Inside a chamber
the ground cable has to be connected between the
ground block and the chamber’s shielding material
(VDE 0877, Part1).
16
RS-232 interface
A bi-directional interface is available for remote con-
trolling. A D-Sub connector (9-pin, female) is located
at the back panel of the LISN; the communication
with a computer according to the EIA-232 standard
is supported.
Pin
2 Tx Data (data from LISN to PC)
3 Rx Data (data from PC to LISN)
5 Ground
9 +5V supply voltage for external devices
(max. 30mA).
The standard voltage level at the Tx, Rx terminals
is ± 12Volts.