Keithley 2701

Model 2701 User’s Manual Basic DMM Operation 3-13
Figure 3-4
ACV measurements – sine waves
AC coupled RMS:
VP
0
V
P
2
CF =
Sine
Half-Wave Rectified Sine
VP
0
RMS:
1
VAVG
VAVG = VP/π
V
RMS =
V
P
CF =
2
+V
0
-V
AC coupled RMS:
+V = VP(1 - 1/π)
-V = -V
P/π
V
P
D/2
VP
2
(VP/π)
2
VRMS =
=
(D/2) – (1/π
2
)
VP
D/2
D/2
CF =
(D/2) – (1/
π
2
)
1
VRMS =
Crest Factor:
VP
0
Full-Wave Rectified Sine
RMS:
VP
2
VRMS =
CF =
2
AC coupled RMS:
VRMS =
=
(1/2) – (4/π
2
)
VP
CF =
1
+V
0
-V
+V = V
P(1 - 2/π)
-V = -2V
P/π
2
VP
2
(2VP/π)
2
(1/2) – (4/π
2
)
-VP
where; D (duty cycle) =
t
T
t
T