HP ESA-L1500A, Руководство пользователя и калибровки

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296 Chapter 9
Performance Verification Tests
22. Tracking Generator Level Flatness, Options 1DN and 1DQ
10.Set the DVM to measure AC Volts. Press the following DVM keys so
that it reads out in dBm:
50 STORE 4
(sets resistance to 50
Ω
for dBm calculation)
MATH 4
(sets DVM to read out in dBm)
11.Set the spectrum analyzer center frequency to 9 kHz and press
Single Sweep
. Record the DVM readout in column 2 of Table 9-25 .
12.Repeat step 11 for all center frequencies listed in Table 9-25 .
Table 9-25 Tracking Generator Level Flatness Worksheet, 100 kHz
13.Subtract the 100 kHz Level Flatness readout in Table 9-24 from the
100 kHz DVM Readout in Table 9-25 and record as the DVM Offset
at 100 kHz.
DVM Offset ____________ dB
For example, if the Level Flatness reading from Table 9-24 is
+0.7 dB and the DVM Readout from Table 9-25 is
−
0.53 dBm, the
DVM offset would be
−
1.23 dB.
14.Add the DVM Offset from step 13 to each of the DVM Readouts in
Table 9-25 and record as the Corrected Level Flatness in column 3.
For example, if the DVM Readout from Table 9-25 is +0.22 dBm, and
the DVM Offset is
−
1.23 dB, the corrected readout would be
−
1.01 dB.
15.Locate the most positive Level Flatness reading in Table 9-24 and
Table 9-25 for frequencies of 10 MHz and less and record this value
as TR Entry 1 of the performance verification test record.
75
Ω
RF Out only: Do not use the data in Table 9-25 .
Center
Frequency
DVM Readout
dBm
Corrected Level
Flatness dB
9 kHz
20 kHz
40 kHz
60 kHz
80 kHz
100 kHz
DVM Level Flatness – DVM Offset =
DVM DVM Offset + Corrected Readout =