Agilent Technologies 6000 Series Service Manual page 45

6000 Series Oscilloscopes Service Guide
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
•
300 MHz Models: 300 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
•
300 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:
Vin
max_freq
14 Calculate the response using the expression:
response(dB) = 20 log
If:
Example
Pmeas
1_MHz
Std Dev(n)
Pmeas
max_freq
Std Dev(n)
Then after converting the values from the power meter to Vrms:
response(dB) = 20 log
=
Pmeas
max freq

Vout

10

= 892 uW
= 210.4 mV
1MHz
= 687 uW
= 161.6 mV
max freq

161.6
 
10
210.4
Testing Performance
× Ω
50
/ Vin
max freq max
Vout / Vin
1 MHz 1 MHz

mV / 185.3 mV
= -1.16 dB
 
mV/ 211.2 mV
2

freq


45