SRS Labs SR850 - Manual (Page 20)

2-8
Displays and Traces
Highlight the internal oscillator frequency.
By setting the lock-in reference 0.2 Hz away from
the signal frequency, the X and Y outputs are
0.2 Hz sine waves (difference between reference
and signal frequency). The X and Y output dis-
plays should now oscillate at about 0.2 Hz (the
accuracy is determined by the crystals of the gen-
erator and the lock-in).
Display the Display and Scale menu.
The SR850 collects data in the form of traces.
There are 4 definable traces and only these trace
quantities may be displayed. The default definition
of these traces is X, Y, R and
θ
for traces 1, 2, 3
and 4.
The Display Scale menu box shows the display
parameters for the Full (screen), Top or Bottom
(split screen) displays. In this case, the Top dis-
play parameters are shown.
Each display shows one of the data traces. The
Top display defaults to showing trace 1 which has
a default definition of X. Thus the top bar graph
shows the X output.
Trace 3 has a default definition of R so showing
trace 3 on the top graph will display the quantity R.
R is phase independent so it shows a steady value
(close to 0.500 V).
[AUTO SCALE] automatically scales the active
display. The top display is the active display (as
indicated by the inverse trace identifier at the
upper left of the display).
To modify the bottom graph, you must display the
bottom graph's parameters in the Display Scale
menu box. This also makes the bottom display the
active display (for autoscaling). The trace indicator
(at the upper left of each display) is highlighted on
the active display.
The bottom display defaults to trace 2 (Y).
Trace 4 is
θ
. The phase between the reference
and the signal changes by 360° every 5 sec
(0.2 Hz difference frequency).
Press <Ref. Frequency>
Use the knob to change the frequency to
999.80 Hz.
4. Press [DISPLAY/SCALE]
Press <Type/Trace> twice to highlight the dis-
played trace number.
Use the knob to change the trace number to 3.
Press [AUTO SCALE]
5. Press <Full, Top or Bottom> to select Bottom.
Press <Type/Trace> twice to highlight the dis-
played trace number.
Use the knob to change the trace number to 4.