Tektronix AFG3000 Series Function Generator Guide v1.0 Portland State University
3
3 – Waveform Characteristics
Figure 2: Characteristics of a periodic waveform (Tektronix terminology)
The amplitude of the waveform is the peak-to-peak variation
1
in voltage. The horizontal shift can be
specified as a phase angle (in degrees).
The waveform’s vertical characteristics (i.e., voltage) can be specified as an amplitude and offset, or as
high and low levels.
Some useful conversion equations are:
Frequency
Period
Period
Frequency
1
1
=
=
LowHigh
Offset
LowHighAmplitude
+
=
2
2
Amplitude
OffsetLow
Amplitude
OffsetHigh
−=
+=
Figure 3: Example sinusoidal waveform with numeric values
1
Math textbooks often define the amplitude as half the peak-to-peak variation. However, Tektronix assumes the
amplitude is the full peak-to-peak value.
Voltage V
Time t
High
Low
Amplitude
t (ms)
+0.75 V
-0.25 V
-90°
1.0 ms
V
= 1.00 V Phase = -90°
Offset = 0.25 V Period = 1.0 ms
High = 0.75 V Freq = 1 kHz
Low = -0.25 V
+0.25 V