Measuring Waveforms
3- 154
CSA7000B Series & TDS7000B Series Instruments User Manual
Note that a vertical cursor readout includes and varies directly with the Time-to-
First-Point component, which varies directly with the horizontal position set for
the timebase. To see the amount of time to the first point, set Horizontal DELAY
to 0.0 and set Horizontal Ref to 0%. Now the Horizontal position readout shows
the time following the first point, and adding this value to the cursor readout
yields the cursor position on screen relative to first point. (You can find the
horizontal readout both in the control window and in the readout at the bottom of
the screen.) The following relationships hold:
Time from First Point = Horiz. Position (when Horiz. Delay and Ref Position are
zero)
T1 readout = Time to First Point + Additional Time t o Cursor
Cursor Units Depend on Sources. A cursor that measures amplitude or time will
read out in the units of its source as indicated in Table 3--10. Note mixed sources
require Delta--Cursor readouts to follow units of the cursor 1 source.
Table 3- 10: Cursor units
Cursors Standard units
1
Readout names
Horizontal volts, watts
V1, V2, ΔV
Vertical seconds, bits
T1, Τ2, ΔT, F1, F2, ΔF
Waveform, Screen volts, watts, seconds, bits
V1, V2, ΔV, T1, T2, ΔT
1
If the V1 and V2 units do not match, the ΔV readout defaults to the units used by the
V1 readout.
Multipurpose knobs. You can change cursor position using the position controls
in the Cursor setup window, dragging the cursor into position using the touch
screen or mouse, or by turning the front-panel multipurpose knobs.
The multipurpose knobs also work with other controls. If a setup window item
has an adjustable value, you can adjust it with the multipurpose knob or keypad
after touching the setup control.
NOTE. To make small changes with the multipurpose knobs, push the FINE
button before turning the knob. When a FINE button is illuminated, its multipur-
pose knob makes smaller adjustments.
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