Keysight Technologies InfiniVision 6000L Series, Service Manual

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36 6000L Series Oscilloscopes Service Guide
2
Testing Performance
• 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
• 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 within -3.0 dB. Record the result in the
Performance Test Record (see page 46 ).
16 Move the power splitter from the channel 1 to the channel 2 input.
17 Turn off the current channel and turn on the next channel using the channel
keys.
18 Repeat steps 3 through 17 for the remaining channels, setting the parameters
of the channel being tested where appropriate.
Vin
maxfreq
Pmeas
maxfreq
50
Ω ×
=
response(dB) = 20 log
10






MHz 1 MHz 1
freq max freq max
Vin / Vout
Vin / Vout
response(dB) = 20 log
10




mV 211.2 mV/ 210.4
mV 185.3 / mV 161.6
= -1.16 dB