SRS Labs SR850 - Manual (Page 36)

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3. Press [AUTO PHASE]
4. Press [DISPLAY/SCALE]
Press <Format> to select Single display.
Press <Type>
Use the knob to adjust the display type to
Chart.
5. Press [TRACE/SCAN]
Press <Scan Length>
Press [1] [0] [0] [ENTER]
Press <1 Shot/Loop> to select 1 Shot.
6. Press [REF/PHASE]
Press [START/CONT]
Press <Rotate 90 deg.> a few times during the
scan to generate some changes in the data.
7. Put a blank double-sided, double density
(DS/DD)3.5" disk into the drive.
ence set at 1.000 kHz. The reference mode (Intrnl)
and frequency are displayed at the bottom of the
screen. In this mode, the lock-in generates a syn-
chronous sine output at the internal reference
frequency.
The sine amplitude is 1.000 Vrms and the
sensitivity is 1 V(rms). Since the phase shift of the
sine output is very close to zero, the upper display
(X) should read close to 1.000 V and the lower dis-
play (Y) should read close to 0.000 V.
Automatically adjust the phase shift so that Y is
zero and X is equal to the magnitude.
Show the Display and Scale menu.
Change the screen to a full screen display.
Highlight the display type.
With the chart display, we can see the data stored
in the trace buffers.
Display the Trace and Scan menu.
Highlight the scan length.
Set the scan length to 100 seconds. At the default
sample rate of 1 Hz, this represents 100 points in
the scan.
Take one scan and then stop.
Display the Reference and Phase menu.
Start the scan. The quantity X is sampled and
stored at a rate of 1 Hz. The trace buffer is
graphed on the chart display as the data is taken.
Each time the phase is shifted by 90°, the value of
X changes from (plus or minus) the signal ampli-
tude to zero and back.
After 100 seconds, the scan will finish and we can
save the graph on disk.
Use a blank if disk if possible, otherwise any disk
that you don't mind formatting will do. Make sure
the write protect tab is off.
The Disk Drive