Calibration
C
lib i
off
Electrical Fast Transient/Burst Generators
According to 61000-4-4(ed2):2004
Presented by :
Standards and Calibration Laboratory (SCL)
Innovation and Technology Commission
The Government of the HKSAR
IEC 61000-4-4
• All electrical
l t i l and
d electronic
l t i equipment
i
t are
subject to electromagnetic interferences.
• Electromagnetic
El t
ti iinterferences
t f
can b
be b
broadly
dl
grouped into continuous interference and
transient interference.
interference
• The International Standard IEC 61000-4-4 is
the standard for transient immunity testing.
testing
• A fast transient burst generator can generate
the required repetitive fast transients/bursts for
the test.
Simplified Circuit Diagram
of EFT/B Generator
Charging
Resistor, Rc
High
voltage
source,, U
Energy
Storage
Capacitor, Cc
Switch
Impedance Matching
Resistor, Rm
Impulse
Duration
Shaping
Resistor, Rs
DC Blocking
Capacitor, Cd
50 ohm
Output
EFT/B Generator
• Th
The values
l
off Cc,
C Rs,
R Rm
R and
d Cd are such
h that
th t
the EFT/B Generator gives a fast transient
output.
output
• The output impedance of the EFT/B Generator
shall be 50 ohm.
ohm
Characteristics (1)
• O
Output
t t voltage
lt
att lleastt 250 V tto 4000 V att 1000
ohm load
• Output
O t t voltage
lt
att lleastt 125 V tto 2000 V att 50
ohm load
• Shall
Sh ll be
b able
bl to
t workk under
d short-circuit
h t i it
conditions.
• Polarity
P l it off output
t t : positive/negative
iti /
ti
• Output type : coaxial, 50 ohm
Characteristics (2)
• DC blocking
bl ki capacitor
it : 10 nF
F  20 %
• Relation to power supply : asynchronous
• Burst duration : 15 ms  20 % at 5 kHz
0.75 ms  20 % at 100 kHz
• Burst period : 300 ms  20 %
Characteristics (3)
• Load
L d impedance
i
d
:
– 50 ohm  2 %
– 1000 ohm
h  2 % in
i parallel
ll l with
ith <= 6 pF
F
– Resistance measured at DC. Capacitance to be
measured at low frequencies
frequencies.
Verification (1)
(6 1 2 of 61000-4-4)
(6.1.2
61000 4 4)
• T
To establish
t bli h common reference
f
for
f allll generators.
t
• Connected to 50 ohm and 1000 ohm coaxial
t
termination
i ti respectively.
ti l
• Output voltage monitored by oscilloscope.
• -3 dB bandwidth of measuring equipment > 400
Mhz.
Verification (2)
(6 1 2 of 61000-4-4)
(6.1.2
61000 4 4)
UUT setting
voltage
Amplitude (into 50 Ω load)
0.25 kV
0.125 kV ± 10 %
0.5 kV
0.25 kV ± 10 %
1 kV
0.5 kV ± 10 %
2 kV
1 kV ± 10 %
4 kV
2 kV ± 10 %
Verification (3)
(6 1 2 of 61000-4-4)
(6.1.2
61000 4 4)
UUT setting
voltage
Amplitude (into 1 kΩ load)
0.25 kV
0.24 kV ± 20 %
0.5 kV
0.48 kV ± 20 %
1 kV
0.95 kV ± 20 %
2 kV
1 9 kV ± 20 %
1.9
4 kV
3.8 kV ± 20 %
Wave shape of repetitive bursts
V
Burst period = 300 ms ±
20 %
Repetitive bursts
t (ms)
15 ms for 5 kHz
and 0.75 ms for 100
kHz
Wave shape of
single burst of pulses
V
Repetition period = 200 μs ± 20 % (for burst frequency 5
kHz) or 10 μs ± 20 % (for burst frequency 100 kHz)
Burst duration 15
ms ± 20 % for
f 5
kHz or 0.75 ms ± 20
% for 100 kHz
Single burst of pulses
t ((ms)
s)
Wave shape of a single pulse
tr = 5 ns ± 30 %
td = 50 ns ± 30 %
1.0
0.9
0.5
td
0.1
Single pulse
tr
t (ns)
Measurement Set-up
Attenuator
50 Ω, 1000:1 or 2000:1
Pulse Output
UUT
Fast Transient Burst
Generator
Digitizing
Oscilloscope
p
Metrological Traceability
Laboratory DC
Voltage Standard
Laboratory
Frequency Standard
Laboratory
RF Power Standard
Digital Multimeter
Frequency Counter
Power Meter with
Sensors
Oscilloscope Calib
Calibration
ation System
S stem
Digital Oscilloscope Agilent
Fast Transient Burst Generator
The Measuands (1)
UUT
setting
lt
voltage
Amplitude (into 50 Ω
load)
0.25 kV
0.125 kV ± 10 %
0.5 kV
0.25 kV ± 10 %
1 kV
0.5 kV ± 10 %
2 kV
1 kV ± 10 %
4 kV
2 kV ± 10 %
Repetition
rate
Rise
time
Pulse
width
5 kHz or
100 kHz
± 20 %
5 ns
± 30 %
50 ns
± 30 %
The Measuands (2)
UUT setting
Amplitude (into 1 kΩ load) Repetition rate Rise time
voltage
0 25 kV
0.25
0.5 kV
1 kV
2 kV
4 kV
Pulse
width
0.24 kV ± 20 %
0.48 kV ± 20 %
0.95 kV ± 20 %
1.9
9 kV
k ± 20 %
3.8 kV ± 20 %
5 kHz
kH or
100 kHz
± 20 %
5 ns
± 30 %
50 ns with
a
tolerance
of -15 ns
to +100
ns
HOKLAS Accredited Scope (1)
HOKLAS Accredited Scope (2)
The End
Thank You