Data Sheet

LABCENTER ELECTRONICS LTD.
230
on the x-axis. The title on the status bar is removed, and will now display the cursor time (in red,
at the left) and the cursor voltage along with the name of the trace in question (at the right). It is
the U1(POS IP) trace that we want.
You can move a cursor in the X direction using the left and right cursor keys, and you can lock a
cursor to the previous or next trace using the up and down cursor keys. The LEFT and RIGHT
keys move the cursor to the left or right limits of the x-axis respectively. With the control key still
down, try pressing the left and right arrow keys on the keyboard to move the Reference cursor
along small divisions on the time axis.
Now place the Primary cursor on the OUT trace between 20u and 30u. The procedure is exactly
the same as for the Reference cursor, above, except that you do not need to hold the CTRL key
down. The time and the voltage (in green) for the primary cursor are now added to the status
bar.
Also displayed are the differences in both time and voltage between the positions of the two
cursors. The voltage difference should be a fraction under 100mV. The input pulse was 10mV
high, so the amplifier has a voltage gain of 10. Note that the value is positive because the
Primary cursor is above the Reference cursor - in delta read-outs the value is Primary minus
Reference.
We can also measure the fall time using the relative time value by positioning the cursors either
side of the falling edge of the output pulse. This may be done either by dragging with the
mouse, or by using the cursor keys (don't forget the CTRL key for the Reference cursor). The
Primary cursor should be just to the right of the curve, as it straightens out, and the Reference