60 Chapter2
Making Adjustments
6. Cal Attenuator Error
1 dB Step Check
6. To measure the 1 dB step correction, press the following analyzer
keys.
FREQUENCY, 25, MHz
SPAN, 10, MHz
75 Ω input: AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm
AMPLITUDE, 18, −dBm
SCALE LOG LIN (LIN), More 1 of 2
AMPTD UNITS, dBm
PEAK SEARCH
MKR FCTN, MK TRACK ON OFF (ON)
SPAN, 50, kHz
BW, 3, kHz
VID BW AUTO MAN, 300, Hz
7. Press the following analyzer keys.
PEAK SEARCH, MARKER DELTA
MKR FCTN, MK TRACK ON OFF (ON)
8. The MKR ∆ amplitude reading should be 0.0 dB ±0.01 dB. If it is not,
repeat step 7.
9. Set the analyzer by pressing
AMPLITUDE, 17, −dBm.
10.Set the amplitude of the synthesizer/level generator to −18 dBm.
11.Press
MKR on the analyzer.
12.Record the MKR ∆ amplitude reading in Table 2-2. This is the 1 dB
attenuator step error of the A12 amplitude control assembly.
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