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14
Getting Started
3.
Use the <Frequency> knob to carefully adjust
the frequency to 99.9998 kHz. That's 0.2 Hz
below 100 kHz.
4.
Press [Screen Layout] once to change the display
to the full screen strip chart.
5.
Touch the orange scale tile {θ} at the bottom to
display the vertical scale palette.
SR865A DSP Lock-in Amplifier
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 f
and f
). The X and Y displays should now
sig
oscillate at about 0.2 Hz (the accuracy is
determined by the timebases of the generator
and the lock-in).
The most common way to visualize the lock-in
outputs is to use the strip chart display. New
data is plotted at the right edge and older data
scrolls left. The scroll rate is determined by the
horizontal scale (time per division). The fastest
rate is 0.5 s/div and the shows 5 s of history.
The info bar is at the top of the screen. Touch a
tile to change a parameter using a keypad.
The numeric and bar graph displays shrink to fit
above the chart.
The scale bar is shown below the strip chart.
This bar shows tiles indicating the vertical scale
per division for the 4 data channels (green, blue,
yellow and orange) and the horizontal time
scale per division (white).
Use the palette functions to adjust the vertical
scale of the selected data channel's trace. Touch
the scale tile again to dismiss the palette.
The trace may be moved up and down, auto
scaled, zoomed in and out and dismissed
entirely.
Chapter 1
ref
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