Chapter 2 155
Making Adjustments
25. Checking the Absolute Amplitude Accuracy for Option 050
Frequency Response Input Attenuator 30 dB
23.On the analyzer, press the following keys.
AMPLITUDE, ATTEN AUTO MAN, 30, dB
AMPLITUDE, 10, +dBm
24.Set the FREQUENCY of the analyzer to the measurement frequency
shown in Table 2-13.
25.On the analyzer, press PEAK SEARCH.
26.On the synthesized sweeper, press CW and set the frequency to the
same measurement frequency as the analyzer is set in the previous
step.
27.On the synthesized sweeper, press POWER LEVEL and adjust the
amplitude so the analyzer marker amplitude reads
+5 dBm ±0.05 dB.
28.Set the power sensor cal factor (for frequency being measured) on
the measuring receiver, then record the measuring receiver power
reading in Table 2-13.
29.Repeat step 24 to step 28 for frequencies of 836 MHz, 881 MHz, and
948 MHz. Record the results in Table 2-13.
Table 2-12 Frequency Response Attenuator 20 dB
Synthesized
SweeperFrequency
(MHz)
Measuring Receiver
Min (dBm) Reading (dBm) Max (dBm)
948 +0.3 _________________ +1.7
881 +0.3 _________________ +1.7
836 +0.3 _________________ +1.7
818 +0.3 _________________ +1.7
Table 2-13 Frequency Response Attenuator 30 dB
Synthesized
SweeperFrequency
(MHz)
Measuring Receiver
Min (dBm) Reading (dBm) Max (dBm)
818 +4.3 _________________ +5.7
836 +4.3 _________________ +5.7
881 +4.3 _________________ +5.7
948 +4.3 _________________ +5.7
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