LANGER
EMV-Technik
7
DE-01728 Bannewitz
[email protected]
www.langer-emv.com
NNB 21 set
6 Application
The measurement set-up should be configured as follows:
- Place the DUT and line-impedance stabilization network on a ground plane,
- Insert the NNB 21 into the supply line between the DUT and power source,
- Use cables that are as short as possible and lay them as straight as possible between
the DUT and the NNB 21
for frequencies up to 100 MHz less than 30 cm,
for measurements with an upper limit frequency of 1 GHz less than 5 cm,
- If both connections of the NNB 21 are used to supply the DUT and the GND switch is
open, the NNB 21 measures the total current (common mode) of both lines.
- For a separate measurement of the HF current in the positive line ( \ Kl 30), the nega-
tive DUT connection must be connected to ground via the ground switch (switch
closed). For this operating mode, the NNB 21 must be placed directly on the ground
plate and the DUT ground must be connected to the ground plate.
Alternatively, the DUT can also be supplied via a single line of the NNB 21. The second
line must be laid separately.
-
To measure the negative line
( \ Kl 31)
, switch off the GND switch.
Figure 2
: Measurement setup