42
7000 Series Oscilloscopes Service Guide
2
Testing Performance
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
•
100 MHz Models: 100 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
•
100 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
response(dB) = 20 log
10
MHz
1
MHz
1
freq
max
freq
max
Vin
/
Vout
Vin
/
Vout
