Keithley 2701, User Manual

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Model 2701 User’s Manual Basic DMM Operation 3-13
Figure 3-4
ACV measurements – sine waves
AC coupled RMS:
V
P
0
V
P
2
CF =
Sine
Half-Wave Rectified Sine
V
P
0
RMS:
1
V
AVG
V
AVG
= V
P
/
π
V
RMS
= V
P
CF =
2
+V
0
-V
AC coupled RMS:
+V = V
P
(1 - 1/
π
)
-V = -V
P
/
π
V
P
D/2
V
P
2
(V
P
/
π
)
2
V
RMS
=
=
(D/2) – (1/
π
2
)
V
P
D/2
D/2
CF =
(D/2) – (1/
π
2
)
1
V
RMS
=
Crest Factor:
V
P
0
Full-Wave Rectified Sine
RMS:
V
P
2
V
RMS
= CF = 2
AC coupled RMS:
V
RMS
=
=
(1/2) – (4/
π
2
)
V
P
CF =
1
+V
0
-V
+V = V
P
(1 - 2/
π
)
-V = -2V
P
/
π
2 V
P
2
(2V
P
/
π
)
2
(1/2) – (4/
π
2
)
-V
P
where; D (duty cycle) =
t
T
t
T
2701-900-01.book Page 13 Wednesday, August 3, 2011 9:43 AM