Technical data

42 7000 Series Oscilloscopes Service Guide
2 Testing Performance
• 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
Then after converting the values from the power meter to Vrms:
V
in
max_freq
Ω×= 50
max freq
Pmeas
response(dB) = 20 log
10






MHz 1 MHz1
freqmax freqmax
Vin / Vout
Vin / Vout
response(dB) = 20 log
10






mV 211.2mV/ 210.4
mV 185.3 / mV 161.6
= -1.16 dB
7000 service guide.book Page 42 Thursday, October 16, 2008 12:18 PM