R&S 1129.7246.03, Operating Manual

Page: 131 / 855

R&S ESU Instrument Functions
APD Mode
4.100 Operating Manual 1302.6163.12 - 03
5. Set the reference level of the measuring receiver to minimum 5 dB above the
maximum level of disturbance that is obtained in step 2).
6. Set the measuring receiver to the APD mode and measure the APD of the
disturbance during the measurement time that is specified by the product family
standard. The measurement time shall be longer than the period of the
disturbance.
7. Change the center frequency of measuring receiver to the next frequency
determined in step 2), then repeat the procedures of steps 4) - 6) until the APD
measurements for all frequencies are carried out.
8. Read the probabilities p
meas
during which the disturbance envelope exceeds a
specified level E
limit
from the results of step 6).
9. Compare p
meas
against the limit
plimit
. The EUT complies if p
meas
is less than or
equal to p
limit
at all frequencies.
10.Or, read the levels
Emeas
for a given probability p
limit
.
11.Compare E
meas
against the limit E
limit
. The EUT complies if E
meas
is less than or
equal to E
Fig. 4.36 Compliance test using the APD method (cases A and B are failing, case C is passing)
Specification
The following specifications described in [ 1 ] shall be applied to the APD measuring
function. A rationale for these specifications is provided in Annex G of CISPR 16-1-
1[
1 ].
1. Amendment 1:2005 to CISPR 16-1-1:2003 (1st Ed.): Radio disturbance and immunity measuring apparatus - Measuring apparatus
CISPR 16-1-1 R&S Test Receiver
Dynamic range of the
amplitude > 60 dB > 70 dB
Amplitude accurancy better than +- 2,7 dB < 2,5 dB for f < 18 GHz
Maximum measurable
time longer than or equal to 2 min 2 min (no dead time)
Minimum measurable
probability 10 -7 10 -7
Assignment of amplitude
levels at least two amplitude levels
with a resolution of 0,25 dB or
better no limitation by using external software