Testing Performance 2
5000 Series Oscilloscopes Service Guide 31
• 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:
• 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:
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:
15 The result from step 14 should be between +3.0 dB and -3.0
dB. Record the result in the Performance Test Record (see
page 48).
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
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