Instrumentation & Measurement Magazine 23-2 - 15

voltage source with an inner resistance Rin by measuring the
output voltage (peak maximum) of the main generator into
two different load impedances of 50 Ω and 1000 Ω, respectively.
The example of measurement uncertainty evaluation for
the Band A, main generator (60 dBμV), is given in Table 3. The
measured results of the Fourier transform method with measurement uncertainty are summarized in Table 4.

Intermediate-Frequency Measurement Method
This method utilizes an EMI measuring receiver and its intermediate frequency output. It is referred to as "video pulse
technique" in MIL-STD-462 [12], and it is referred to as "video
pulse technique" and "area method" in [5]. The method uses a

Fig. 2. CISPR pulse generator Schwarzbeck IGUU 2916.

Table 2 - Impulse area of a generator for different bands specified in the EN 55016-1-1 standard
Band

A

B

C

D

9 - 150 kHz

0.15 - 30 MHz

30 - 300 MHz

300 - 1000 MHz

Impulse area (open-circuit)

13.5 μVs

0.316 μVs

0.044 μVs

0.044 μVs

Impulse area (into 50 Ω load)

6.75 μVs

0.158 μVs

0.022 μVs

0.022 μVs

25 Hz

100 Hz

100 Hz

100 Hz

Frequency range

Repetition rate

Fig. 3. Typical measurement setup. (a) Use of a DRTO; (b) Use of a DSO.

Table 3 - Example of uncertainty calculation, band A, frep = 25 Hz, frequency 9 kHz
Standard
uncertainty
u(xi)

Sensitivity
coefficient
ci

Uncertainty
contribution
u(yi)

1

0.060 dB

1

0.060 dB

normal

1

0.020 dB

1

0.020 dB

U-shaped

1.41

0.006 dB

1

0.006 dB

Estimate
xi

Estimate
uncertainty
u(xi)

kosc

0 dB

0.060 dB

normal

kATT

0 dB

0.020 dB

MATT-osc

0 dB

0.008 dB

Quantity
Xi

Probability
distribution

Divisor

Mgen-ATT

0 dB

0.001 dB

U-shaped

1.41

0.0007 dB

1

0.0007 dB

type A

0 dB

0.038 dB

rectangular

1.73

0.022 dB

1

0.022 dB

April 2020	

total

0.067 dB

expanded
uncertainty
(k = 2)

0.13 dB

IEEE Instrumentation & Measurement Magazine	15



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