Trace Math

 

and right edge of the graph display. In this case,

 

50 seconds of data (800 data points at 16 Hz

 

sample rate).

 

The results are displayed at the bottom of the

 

screen. The standard deviation (σ)should be about

 

6 nV or so. This is the rms noise of the input in a

 

noise equivalent bandwidth of 1.2 Hz (100 ms, 12

 

dB/oct time constant). The input noise (in Volts/

 

Hz) is thus the standard deviation divided by the

 

square root of 1.2 Hz.

 

The lock-in can measure noise directly in V/Hz,

 

this measurement is meant to illustrate the statisti-

 

cal functions.

Press <Return> twice.

Return to the main Math menu.

8. Press <Smooth>

Choose the Smoothing menu.

Press <17 point>

Perform 17 point smoothing on the noisy data. The

 

data should become less noisy and smoother.

 

Smoothing reduces narrow variations in the data.

Press [CURSOR]

Use the knob to move the cursor past the left edge of the graph. The data will scroll to the right to display unsmoothed portions of the trace.

Press <Return>

8.Press <Calc> Press <Operation>

Use the knob to select x2. Press <Do Calc.>

Let the knob move the cursor.

The smoothing operation changed the data within the time window of the graph. Data which was not displayed was not smoothed. This trace now con- tains a region which has been smoothed and a region which is untouched.

Smoothing changes the data in the buffer and the original unsmoothed points are lost.

Return to the main Math menu.

Choose the Calculator menu.

Highlight the operation.

Let's square the data.

Calculations are performed on all of the data within the time window of the graph. Let the calcu- lation finish.

Press [AUTO SCALE]

X squared is a positive quantity. The magnitude of

 

the data is now 10-18so auto scale is required to

 

view the data.

Use the knob to select .

Select square root.

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Image 49
SRS Labs SR850 manual Right edge of the graph display. In this case

SR850 specifications

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