User manual

PicoScope and oscilloscope primer24
Copyright © 2007-2013 Pico Technology Ltd. All rights reserved.psw.en r32
5.16
Ruler legend
The ruler legend is a box that displays the positions of all the rulers you have placed
on the view. It appears automatically whenever you position a ruler on the view:
Editing
You can adjust the position of a ruler by editing any value in the first two columns. To
insert a Greek µ (the micro symbol, meaning one millionth or x 10
-6
), type the letter
'u'.
Tracking rulers
When two rulers have been positioned on one channel, the Lock button appears
next to that ruler in the ruler legend. Clicking this button causes the two rulers to
track each other: dragging one causes the other one to follow it, maintaining a fixed
separation. The button changes to when the rulers are locked.
TIP: To set up a pair of tracking rulers with a known distance between them, first
click the Lock button, then edit the two values in the ruler legend so that the rulers
are the desired distance apart.
See also: frequency legend.
5.17
Frequency legend
The frequency legend appears when you have placed two time rulers on a scope
view. It shows 1/ in hertz (the SI unit of frequency, equal to cycles per second),
where is the time difference between the two rulers. You can use this to estimate
the frequency of a periodic waveform, but you will get more accurate results by
creating a frequency measurement using the Add Measurements button on the
Measurements toolbar.
For frequencies up to 1.666 kHz, the frequency legend can also show the frequency in
RPM (revolutions per minute). The RPM display can be enabled or disabled in the
Preferences > Options dialog.