Testing Performance
2
2000/3000 X-Series Oscilloscopes Service Guide
43
9
Change the signal generator output frequency according to the maximum
frequency for the oscilloscope using the following:
•
1 GHz Models: 1 GHz
•
500 MHz Models: 500 MHz
•
350 MHz Models: 350 MHz
•
200 MHz Models: 200 MHz
•
100 MHz Models: 100 MHz
•
70 MHz Models: 70 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 GHz Models: 500 ps/div
•
500 MHz Models: 1 ns/div
•
350 MHz Models: 2 ns/div
•
200 MHz Models: 2 ns/div
•
100 MHz Models: 5 ns/div
•
70 MHz Models: 5 ns/div
12
Note the oscilloscope Std Dev(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
Std Dev(n)
1MHz
= 210.4 mV
Pmeas
max_freq
= 687 uW
Std Dev(n)
max freq
= 161.6 mV
Vin
maxfreq
Pmeas
maxfreq
50
Ω
×
=
response(dB) = 20 log
10
MHz
1
M Hz
1
freq
max
freq
max
Vin
/
Vout
Vin
/
Vout
Содержание InfiniiVision 2000 X Series
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