AMETEK CTS
NSG 3040A, 3060A series
Operating Manual
V 1.04
148 / 157
17.4. Ring wave pulse application
Discharge switch:
The discharge switch is a highly reproducible semiconductor switch.
17.5. Coupling/decoupling network
The coupling network must couple the interference pulses to the lines of a power supply system (AC or DC).
Capacitive coupling is the specified coupling mode for surge testing.
17.5.1.
Coupling to AC/DC power supply lines
The ring wave generator NSG 3060A has an integrated coupling network in accordance with IEC 61000-4-12. It
must be possible to test with different coupling modes:
Coupling Line to Line
Coupling Line to Earth
The release of the surge pulses is mostly related to a certain phase angle. The Ringwave pulses are
synchronized to the EUT-supply input (10...300 VAC / 15...500 Hz).
Attention:
The decoupling part of the coupling/decoupling network includes some capacitors for filtering related tp
protective Earth (chassis of the generator). This is to be conform to the requirement of IEC 61000-4-12 concerning
attenuation of the surge transients in direction to the power mains supply input of the CDN.
As consequence there will exist an increased current to PE (protective earth) which might be hazardous to the
operator in case of a failure or wrong installation. Therefore, it is very important to take the following points into
account before setting the generator into full operation.
1. Due to this increased current into the PE system no earth fault current protectors can be used within a
surge testing area.
3. As consequence the surge generator shall be connected always to Protective Earth, even if no test is
conducted.
via plugged in power mains supply cable including the PE wire !!!!
via plugged in EUT power mains supply at the rear side of the generator, including the PE wire !!!!
via Ground Reference Connector, screwed to the chassis of the generator.
These measures result in double safety in case of a fault