Trace Math

Use the knob to select 50 nV.

To measure the input noise, we need to use an

 

appropriate sensitivity.

4. Press [TRACE/SCAN]

Display the Trace and Scan menu.

Press <Sample Rate>

Since the time constant is 100 ms, we need a

 

sample rate greater than 1 Hz to record the output.

Use the knob to change the sample rate to

Choose 16 Hz as the sample rate.

16 Hz.

 

 

Leave the scan mode on Loop. Data will be

 

recorded indefinitely with the trace buffer storing

 

the last 16k (1000 seconds) of data.

5.Press [DISPLAY/SCALE]

Press <Format> to select Single. Press <Type>

Use the knob to select Chart. Press <± Range>

Press [5] [0] [EXP] [-] [9] [ENTER] Press <sec/Div> (the last softkey). Use the knob to select 5.0 S/Div.

6.Press [START/CONT]

Wait until the data fills the graph (50 sec) and data starts scrolling past the left edge.

Press [PAUSE/CONT]

7.Press [MATH] Press <Stats> Press <Do Stats>

Show the Display and Scale menu.

Use a full screen display.

Highlight the display type.

Math functions require a chart display.

Highlight the chart range.

Enter 50 nV for the chart range.

Highlight the horizontal time scale.

Change the scale to 5.0 S/Div so 50 seconds of data will fill the graph.

Start the scan. The X output is recorded on the chart display. The chart shows the last 50 seconds of data. The graph should be a noisy trace about 2 divisions peak to peak.

Pause the data acquisition. No new data is record- ed and the graph stops scrolling to the left.

Display the Math menu.

Choose the Statistics menu.

The mean, standard deviation, total and time span are calculated for the data between the left and right limits. The limits are shown as vertical heavy dashed lines. The limits default to the left

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Image 48
SRS Labs SR850 manual Trace Math

SR850 specifications

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