Schwarzbeck TEMP 8400 Tempest AMN (LISN)

The symmetrical AC-network TEMP 8400 consists of two identical channels for the lines "A" and "B". It is constructed with air core inductors, in order to avoid intermodulation interference. For the evaluation of interference phenomena the unsymmetrical interference voltage of a conductor to ground reference in the frequency range of 9 kHz to 1 GHz can be measured. Lower-frequency interference that may cause damage to the measuring receiver input shall be mitigated by additional high-pass filters.

Application

The N-terminals "A" and "B" represent the reference plane for high frequency measurements on the EUT-side of the TEMP 8400.For the connection of the EUT the N-terminals are annoying. Therefore the adapter TEMP 8401 wing connectors / N male connectors must be attached to the connectors "A" and "B" of the front panel.

The EUT is connected to the wing terminals of the adapter. The power supply or mains (AC) connectors are at the back side of the TEMP 8400 (AE port). The wing terminals are not removable, so hook type cable lugs or 4 mm laboratory plugs can be used for contacting.

More adapters are available i.e. TEMP 8401 GB - N to BS1363 (British type G connector) or TEMP 8401 DE - N to CEE 7/3 (Schuko). The maximum allowed continuous current of the EuT is 16 A. The voltage drop is approximately 22 V at 50 Hz and 25 °C. For a short time 25 A may be drawn. The temperature of the integrated inductors must not exceed 150° C when currents higher than 16 A are drawn.

Simplified Circuitry of the AMN TEMP 8400

The EUT is connected to the front side (EUT). The RF noise voltage emitted by the sample is decoupled to the N-jack "Output A" or "Output B". These outputs must be connected to a 50 Ω measuring receiver.

Please note: The N-connectors "A" and "B" are provided for connecting the adapter. The measuring receiver must not be connected to “A” or “B” in any case. Risk of destruction!

The unsymmetrical disturbance voltage is measured between terminal "A" or "B" to reference ground (so-called V-LISN).

The input impedance seen from the EUT is 50 Ω.

The RF reference ground is connected to the GND terminals or using the aluminum bars on the back.

Notice: In any case, ground-connect LISN before connecting to power line. Precise safety instructions must be provided to any user of the LISN. Inappropriate usage of the LISN may cause deadly injuries!

Always switch off supply voltage before connecting or disconnecting terminals. An easily accessible circuit breaker before and behind the LISN is a must! The capacitors of the LISN can store charge over a short time, even if the LISN is completely disconnected from power supplies and EUT. We recommend discharging the capacitors using an isolated cable to ground before touching the terminals. The discharge-resistors from “A” or “B” to “GND” are 220 kΩ.

Air circulation must be possible at any time. Neither the top side nor the bottom side of the LISN may be covered during operation!

Impedance at EUT- N-jack , output is terminated with 50 Ω	VSWR at EUT- N-jack , output is terminated with 50 Ω
Decoupling between EuT and Generator Terminals AE (50 Ω System)	Voltage Division Ratio EuT-N jack to Output-N jac