Technical data

Testing Performance 2
4000 X-Series Oscilloscopes Service Guide 49
9 Change the signal generator output frequency according to
the maximum frequency for the oscilloscope using the
following:
• 1.5 GHz Models: 1.5 GHz
• 1GHz Models: 1GHz
• 500 MHz Models: 500 MHz
• 350 MHz Models: 350 MHz
• 200 MHz Models: 200 MHz
10 Referencing the frequency from step 9, set the power
meter Cal Factor % to the frequency value on the
calibration chart on the power sensor.
11 Set the oscilloscope sweep speed according to the
following:
• 1.5 GHz Models: 500 ps/div
• 1 GHz Models: 500 ps/div
• 500 MHz Models: 1 ns/div
• 350 MHz Models: 2 ns/div
• 200 MHz Models: 2 ns/div
12 Note the oscilloscope AC RMS - FS(1) reading at the
bottom of the screen.
13 Note the reading on the power meter and covert to Vrms
using the expression:
14 Calculate the response using the expression:
Example If:
Pmeas
1_MHz
= 892 uW
AC RMS - FS(n)
1MHz
= 210.4 mV
Pmeas
max_freq
= 687 uW
AC RMS - FS(n)
max freq
= 161.6 mV
Vin
maxfreq
Pmeas
maxfreq
50Ω×=
response(dB) = 20 log
10






MHz 1 MHz 1
freqmax freqmax
Vin / Vout
Vin / Vout