Calibration
lib i
off Pulse
l Response off EMI
Quasi-Peak
Quasi
Peak Measuring Receiver
According to CISPR16-1-1:2006
Presented by :
Standards and Calibration Laboratory (SCL)
Innovation and Technology Commission
The Government of the HKSAR
Quasi-peak Receiver
• The receiver specification depends on the
frequency of operation.
• Band A – 9 kHz to 150 kHz
• Band B – 150 kHz
kH to 30 MH
MHz
• Band C – 30 MHz to 300 MHz
• Band D – 300 MHz to 1 GHz
Input Impedance
• Nominally 50 ohm unbalanced input
• VSWR within 2.0
2 0 without input attenuator
• VSWR within 1.2 with input attenuator of 10 dB
o greater
or
g eate
• Use automatic network analyzer to measure the
VSWR directly from the input port, which is
normally fitted with Type N (female connector).
Sine-wave Voltage Accuracy
• The accuracy of measurement of sine-wave
voltages shall be better than +/+/ 2 dB when
supplied with a sine-wave signal at 50 ohm
source impedance.
• Use calibrated RF signal generator up to 1 GHz.
Response to Pulses
• Amplitude relationship (absolute calibration)
• Variation with repetition frequency (relative
calibration)
Pulse Response –
amplitude relationship
The response of the QP receiver to pulses of
– impulse area of (*) uVs e.m.f. at 50 ohm source impedance
– uniform spectrum up to (#) MHz
– repetition frequency of (&) Hz
shall
h ll be
b same as that
h off an unmodulated
d l d sine-wave signall
at the same frequency with e.m.f. of r.m.s. 2 mV (or 66
dBuV).
dBuV)
A tolerance of +/- 1.5 dB is permitted
* column 2 of next table
# column 3 of next table
& column 4 of next table
Pulse Response –
amplitude relationship
Frequency
Range
Impulse Area (µVs)
of Source emf at 50
ohm impedance
Upper
Frequency
q
y
Spectrum
Pulse
Repetition
p
Frequency
9 – 150 kHz
13.5
150 kHz
25 Hz
0 15 – 30 MH
0.15
MHz
0 316
0.316
30 MH
MHz
100 Hz
H
30 – 300 MHz
0.044
300 MHz
100 Hz
300 – 1000 MHz
0.044
1000 MHz
100 Hz
Typical Output Waveform of a
Calibraton Pulse Generator
Variation with repetition
frequency (relative calibration)
The response of the QP receiver shall be such that
for a constant reading on the QP receiver, the
relationship between amplitude and repetition
frequency is in accordance with the next 3 figures.
Pulse response –
variation with repetition frequency
Relativve input forr constant o
output (dB)
Pulse response curve (Band A)
20
15
10
5
0
-5
5
-10
1
10
Pulse repetition frequency (Hz)
100
Pulse response –
variation with repetition frequency
Relattive input fo
or constant output (dB)
Pulse response curve (Band B)
25
20
15
10
5
0
5
-5
-10
1
10
100
Pulse repetition frequency (Hz)
1000
Pulse response –
variation with repetition frequency
Relattive input fo
or constant output (dB)
Pulse response curve (Band C and D)
35
30
25
20
15
10
5
0
-5
-10
1
10
100
Pulse repetition frequency (Hz)
1000
Pulse Response Table
Repetition
Frequency
Hz
Relative Equivalent Level in dB of Pulse for stated Band
Band A
(9 – 150 kHz)
Band B
(0.15 – 30 MHz)
Band C
(30 – 300 MHz)
Band D
(0.3 – 1 GHz)
1 000
N/A
-4.5
4 5 ± 1.0
10
-8.0
8 0 ± 1.0
10
-8.0
8 0 ± 1.0
10
100
-4.0 ± 1.0
0 (ref.)
0 (ref.)
0 (ref.)
60
-3.0 ± 1.0
N/A
N/A
N/A
25
0 (ref.)
N/A
N/A
N/A
20
N/A
+6.5 ± 1.0
+9.0 ± 1.0
+9.0 ± 1.0
10
+4 0 ± 1.0
+4.0
10
+10 0 ± 1.5
+10.0
15
+14 0 ± 1.5
+14.0
15
+14 0 ± 1.5
+14.0
15
5
+7.5 ± 1.0
N/A
N/A
N/A
2
+13.0 ± 2.0
+20.5 ± 2.0
+26.0 ± 2.0
+26.0 ± 2.0
*1
1
+17.0 ± 2.0
+22.5 ± 2.0
+28.5 ± 2.0
+28.5 ± 2.0
*1
Isolated
pulse
p
+19.0 ± 2.0*2
+23.5 ± 2.0*2
+31.5 ± 2.0*2
+31.5 ± 2.0
Notes: 1. N/A represents it is not applicable.
2. *1 represents the marked values are optional and not essential.
3. *2 represents the limit for isolated pulse only.
*1, *2
Calibration Pulse Generator
• Generated from the EMI Calibration Pulse
Generator, Schwarzbeck IGUU 2916
• Calibrated by PTB, Germany
• Standard
Standa d Pulses:
P lses
• Band A- 13.5 uVs
• Band B- 0.316 uVs
C/D- 0.044 uVs
• Band C/D
Calibration Pulse Generator
Pulse generator characteristics
F
Frequency
b
band
d
I
Impulse
l Area
A
R
Repetition
titi Frequency
F
(H
(Hz))
90 kHz to 150 kHz
13.5 Vs
1,2,5,10,25,60,100
150 kHz to 30 MHz
0.316 Vs
1,2,10,20,100,1000
30 to 300 MHz
0.044 Vs
1,2,10,20,100,1000
300 to 1000 MHz
should be able to
produce pulses of
adequate impulse area
with uniform spectrum
up to 1000 MHz.
1 2 10 20 100 1000
1,2,10,20,100,1000
Spectrum of generated pulses
• Substantially constant up to the upper limit of the
frequency band of receiver under test
• Variation of spectrum amplitude is not greater than 2 dB
relative to its value for the lower frequencies within the
b d
band.
• Impulse area at test frequency shall be known to within
+/ 0 5 dB.
+/-0.5
dB Repetition
R
titi frequency
f
to
t within
ithi 1%
1%.
• Spectrum above upper limit of the band shall be limited
(10 dB down at twice the upper frequency)
HOKLAS Accredited Scope
The End
Thank You