Comparison Of Average And Trms Meter Readings - Keithley 199 Instruction Manual

ElASlC DMM OPERATION
The aest factor of other wavefoms will, of course, depend
on the waveform in question because the ratio of peak to
Where T = period
RMS value will vary Fbr -pie, the crest factor of a pulse
t = pulse width
is computed as follows:
This relationship holds for all pulse waveforms.
Table 2-5. Comparison of Average and TRMS Meter Readings
Waveform
%lle
AC
AVerage AC Coupled
Coupled Responding
Averaging
TRMS M&r
Peak RMS
Meter
M&T Percent
V&E
Vah
Reading
Reading
Error
+,O--
lov ZON
7.07v
47
zO7V 0%
0
Half-Wave Rectified Sine
+:m
?ull-Wave Rectified Sine
+:m
>quare
+10- -
0
%-
Rectified Square Wave
'7-
lov 3.86V
3.9ov
3.86V 1%
1ov 3.08V 2.98v 3.08V 3.2%
lov 1o.oov
11.10v
1o.ooV 11%
XIV
5.OOV
5.55v 5.Oov 11%
&tangular Pulse lov 10. JK 22x
lO'Jk----
+10--
-
x
4?fP
[ 2.y"'-K] xl00
o Y
D.W
K.D.D'
iiangular Sawtooth XIV
5.77v
5.55v 5.77v 4%