Table 3-3 Typical Errors For Various Pulse Waveforms As A Function Of Input Pulse Frequency - Agilent Technologies 34450A 5½ Digit Multimeter User Manual

Table 3-3 Typical errors for various pulse waveforms as a function of input pulse frequency

prf
Square wave
200
1000
2000
5000
10000
20000
34450A Users Guide
Notice that crest factor is a composite parameter, dependent
upon the pulse- width and repetition frequency; crest factor
alone is not enough to characterize the frequency content of
a signal.
Traditionally, digital multimeters include a crest factor
derating table that applies at all frequencies. The
measurement algorithm used in the 34450A multimeter is
not inherently sensitive to crest factor, so no such derating
is necessary. With this multimeter, as discussed in the
previous section, the focal issue is high- frequency signal
content which exceeds the multimeter's bandwidth.
For periodic signals, the combination of crest factor and
repetition rate can suggest the amount of high- frequency
content and associated measurement error. The first zero
crossing of a simple pulse occurs at
1
=
f
1
t
p
This gives an immediate impression of the high- frequency
content by identifying where this crossing occurs as a
function of crest factor:
Table 3- 3
waveforms as a function of input pulse frequency:
Typical error for square wave, triangular wave, and pulse trains of CF=3, 5, or 10
Triangle wave
–
0.02% 0.00%
–
0.07% 0.00%
–
0.14% 0.00%
–
0.34% 0.00%
–
0.68% 0.00%
–
1.28% 0.00%
=
f
1
below shows the typical errors for various pulse
CF=3
–
0.04%
–
0.18%
–
0.34%
–
0.84%
–
1.75%
–
3.07%
Measurement Tutorial
2
⋅
CF prf
CF=5
–
0.09%
–
0.44%
–
0.88%
–
2.29%
–
4.94%
–
8.20%
3
CF=10
–
0.34%
–
1.71%
–
3.52%
–
8.34%
–
26.00%
–
45.70%
89