L3Harris NARDA PMM ER8000 User Manual page 22

2.11 Using an Artificial
Mains Network
(AMN or LISN)
2.12 Using the Pulse
Limiter
2-4 Installation
When using a PMM LISN, it is possible to control from the receiver the lines
of the LISN and automatically switch between them connecting a special
cable between the User Port of the receiver and the LISN remote control
input.
Push and keep pressed the "ON/OFF" button for more then 2 seconds to
switch off the receiver.
The internal LISN is automatically controlled by the software and there is no
need for any other connection or switch than the Mains line and the EUT
plug. When the PMM ER8000 receiver is connected to an external LISN to
perform conducted interference measurements of the EUT, the RF output of
the LISN shall be connected to the RF input of the receiver (see Fig. 4-3 on
page 4-4). In order to switch automatically between the lines of the LISN, it
shall be connected to the User Port of the receiver thanks to the dedicated
cable supplied with the LISN .
Using PMM ER8000 Software Utility it is possible to carry out an automatic
measurements on all mains lines and get the worst case.
In order to avoid the unwanted tripping of the protection devices, an
insulation transformer shall always be used between the mains supply
and a LISN.
The built in pulse limiter is a useful device to protect the input of the receiver
from transient over voltages. Sometime the conducted disturbances entering
the receiver through the LISN are too high - even if they cannot be seen on
the PMM ER8000 because they are out of measurement bandwidth - and the
associate energy is high enough to damage the input circuit.
The pulse limiter shall be used only as a protection of the input from
unexpected pulses.
When using an external Artificial Mains Network, to reduce the
probability of damages caused by transient voltage pulses always
disconnect the PMM ER8000 RF input before switching Equipment
Under Test supply ON or OFF.