LISN2-S voltage transient emission switching switch-Century Wisdom (Suzhou) Testing Technology Co., Ltd

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LISN2-S voltage transient emission switching switch

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TESEO

LISN2-S voltage transient emission switching switch

Product Description
Main features
Technical parameters

- Commodity name: LISN2-S voltage transient emission switching switch
- Commodity ID: 1064745143899934720
- 品牌11: TESEO
- 描述: LISN2-S is designed to perform conducted voltage emission tests in accordance with ISO 7637-2:2004
- 品牌: TESEO
　　The LISN2-S is dedicated to performing conducted voltage emission tests according to ISO 7637-2:2004. The block diagram of LISN2-S is as follows, it consists of 2 switches, some parallel resistors and an artificial power network according to ISO 7637-2:2004. During the transient emission test, only one of the switches should be controlled at a time. Switch SW1 is a standard automotive relay used to measure slow transient emissions (pulses on the order of milliseconds with amplitudes in excess of 400V). Switch SW2 is a solid state electronic relay used to measure low voltage transient emissions (microsecond to millisecond pulses with amplitudes less than 400V).

　　Connecting resistors (optional 120Ω, 40Ω, 20Ω, 10Ω or external) are used to simulate the DC resistance of other electrical devices of the vehicle connected in parallel with the DUT. They have low inductance and allow the use of series/parallel combinations.

　　Artificial power network, in full compliance with the ISO 7637 standard, the typical impedance |ZPB| is the impedance between P and B terminals measured when SW2 is open, SW1 is closed, and A and B terminals are short-circuited. Therefore, when the impedance is calibrated, it should be measured between the P terminal and the B terminal, and keep SW2 open. Through a 100:1 voltage divider, a monitor signal is generated, output on the front panel using a BNC connector, allowing evaluation of transient voltages generated by the DUT during switching. The operator can freely choose the switch.

　　During the test, a switch (SW1 or SW2) is normally closed, and the operator can control this switch to open for 3ms to 800ms, thereby generating a power interruption pulse between the battery power line and the DUT.

　　There are three different modes of operation to generate interrupt pulses:

　　In the automatic trigger mode, the frequency of the power interruption pulse is one pulse per second

　　In the manual trigger mode, every time the operator issues a manual trigger, a power interruption pulse will be generated

　　In the external trigger mode, every time an external trigger is received (TT signal changes from high to low), a power interruption pulse will be generated

　　About 5μs before power interruption occurs, a synchronous trigger signal will be output on the SYNC OUT (BNC connector) on the front panel, which can be used to synchronize an external oscilloscope to ensure that each transient voltage can be observed on the MONITOR OUT connector ( sync) to. It should be noted that the return signal of SYNC OUT is always connected to the chassis shell, while the return line of MONITOR OUT is connected to the return line of the battery (on the rear panel of LISN2-S, there is a GROUND socket, which can be used to connect battery return wire to chassis ground).

　　The LISN2-S is capable of delivering 50A at 60V battery voltage and is protected against permanent load short circuits by a thermal switch (not shown in the block diagram).

　　There is also a second protection mechanism (not shown in the block diagram), if a smaller load (such as 10Ω) and the highest battery voltage (such as 60V) are selected, the internal temperature of LISN2-S will be higher than At 110°C, the shunt resistor will be disconnected immediately, and the internal fan will be turned on, and an alarm indication will be generated on the front panel at the same time. When the internal temperature of the device is below 70°C, the shunt resistor is connected to the battery line again.

universal
Test voltage	Up to 60 Vdc@50A
Operating temperature	23°C±5%
physical size	19"-6U , depth400mm
Load short circuit protection	Use thermal switch
Parallel load (maximum rated power@10Ω)	800 Watts (series/parallel combination of 16 resistors)
Temperature Sensor	Thermistor (NTC), fixed on parallel load heat sink
Cut off the load and turn on the temperature of the cooling fan	≥110°C
Artificial Power Network (LISN)
inductance	5 μH
Inductive impedance	<5 mOh
capacitance	C=0.1 μF，200VAC，1500VDC
impedance	According to ISO 7637-2:2004 (±10%)
slow pulse switch
type	Automotive Relays with Transient Suppression Coils
Contact current rating	I=70A(max) , contact uninhibited
contact material	high purity silver
Rated voltage	Greater than 400V
fast pulse switch
type	electronic switch
maximum voltage	400V (up to 600V)
Maximum current	50A
Test voltage	13.5V and 27V
exist25A, the voltage drop ΔU≤1V
With DUT, switching time Δts=300ns±20%
R=0.6Ω, L=50μH (1KHz)
Parallel resistance
RS=10, 20, 40, 120Ω or external, optional
Device Configuration
Slow pulse switching and LISN
LISN and Fast Pulse Switching
power off
Pulse duration	3ms to 800ms, optional
pulse trigger	Automatic, repetition rate 1Hz Manual, controlled by buttons External, TTL high to low
Connector
Synchronization output/monitor output/trigger input	BNC（f）
output	6mmSafety Banana Jacks