Tektronix 2465A

Operation
Measure Frequency with Cursors
1. Turn on the 1/~t cursors and readout by pressing the ~V and ~t
buttons together.
2. Align the cursors with identical pOints, such as zero crossings, on
adjacent cycles of the waveform, using the ~ REF and ~ knobs.
3. The readout shows the frequency of the signal.
4. Press ~ V and ~t together or press either ~ button twice to turn off the
1 / ~ t cursors and readout.
Measure Voltage Ratio, Time Ratio (such as Duty Factor), or
Phase
1. Set VOL TS/DIV or SEC/DIV so a feature of the waveform which you
consider the 100% reference covers more than five divisions of the
graticule.
2. Turn the VOL TS/DIV VAR or SEC/DIV VAR counterclockwise from the
detent
until the 100% reference feature covers exactly five divisions.
You can use one signal as a reference and compare others to it. For
phase, set one
cycle, which is the 360 degree reference, to five
divisions.
3. Press ~ V to measure vOltage ratio, At for time ratio, or ~ V and At
together for phase. The VAR must be counterclockwise from the detent
position to turn on the RATIO or PHASE readout.
4. Turn ~ REF and ~ to align the cursors with the portion of the waveform
to
be compared to the reference portion. Phase is usually a two-channel
measurement between zero crossings. (Se sure zero crossings for
phase measurements are positioned at the graticule center.)
5. The readout shows the ratio or phase shift.
6. Press the same AV or ~t button, or both, to turn off the cursors and
readout.
Choosing Tracking or Independent Delta Mode
Use the INDEP mode for most measurements, with each cursor
independently adjustable. Use TRACK mode, where the A REF knob moves
both cursors as a pair, to compare waveform features. The A control moves
only the ~ cursor.
2465A/2455A/2445A Operators
2-11