NARDA PMM 9010 Series, User Manual

Page: 99 / 284

Click Mode Operating Instructions 10-7
10.4.3 Calculate Limit
Quartile When the click rate N is determined it is possible to calculate the click limit
Lq by increasing the relevant limit (quasi-peak) L for continuous
disturbances with:
●
44 dB for N<0,2, or
●
20 log (30/N) dB for 0,2<N<30
Therefore
N
Log L L
q
30
20
⋅ + =
10.4.4 Measurement vs.
Lq limit
Now the test can be done at the 4 fixed frequencies dictated by the
standard: 150 kHz, 500 kHz, 1.4 MHz, 30 MHz, and the results compared
with the limit Lq.
If less than 25% of the clicks measured exceeds the limit Lq, then the test
is positive, otherwise it fails.
The PMM 9010 can now produce an extensive report with all the relevant
data.
10.5 Start
As soon as the Setup has been done (see § 9.5), it is possible to start the
test.
First of all the PMM 9010 will determine the click rate N, and – if all the
conditions apply – after that the analyzer will immediately continue
measuring the number of clicks exceeding the upper quartile limit L
q
.
Simply select Start : the PMM 9010 will automatically take care of all the
necessary steps, reporting at the end of the test all the relevant results.
During the test, the evolution of the measurements can be continuously
controlled in the Data and Details windows, where all the info are duly
provided.
At any time, it is possible to
Stop the measure or to Pause it.
The PMM 9010 does the determination of the click rate at the two
frequencies of 150 kHz (
Step 1 ) and 500 kHz ( Step 3 ).