SRS Labs SR850 - Manual (Page 50)

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Press <Do Calc.>
Press [AUTO SCALE]
Use the knob to select log10.
Press <Do Calc.>
Use the knob to select ❊ .
Press <Argument Type> to select Constant.
Press <Constant Value>
Press [2] [0] [ENTER]
Press <Do Calc.>
Press [AUTO SCALE]
Press [CURSOR]
Use the knob to read points from the graph.
9. Press [PAUSE/RESET]
10. Press [DISPLAY/SCALE]
Press <Format> to select Up/Down.
11. Press [GAIN/TC]
Press <Sensitivity>
Use the knob to change the sensitivity to 1V.
Press <Time Constant>
Use the knob to change the time constant to
3S.
Press <Filter db/oct.> until 6 db is selected.
12. Press [TRACE/SCAN]
Press <Scan Length>
Press [5] [0] [ENTER]
The net effect is to take the absolute value of X.
Let the calculation finish.
The magnitude of the data is back to 10
-9
.
Take the log of |X|.
Let the calculation finish.
Let's multiply the data by something.
Multiply the data by a constant.
Highlight the constant value.
Enter 20.
The final data is 20log|X| which results in a graph
of X scaled in dBV. Let the calculation finish.
Auto scale the graph.
Activate the cursor.
The values of the data should be in the range
below -160 dBV and below.
Clear the data buffers for the next measurement.
Show the Display and Scale menu.
Display the bar graphs.
Display the Gain and Time Constant menu.
Highlight the sensitivity.
Change the sensitivity to measure the Sine Out.
Highlight the time constant.
Use a long time constant.
Choose the simplest filter response.
Show the Trace and Scan menu.
Highlight the scan length.
Enter a scan length of 50 seconds.
Trace Math