User`s guide

90 34450A User’s Guide
3 Measurement Tutorial
The table above gives an additional error for each waveform,
to be added to the value from the accuracy table provided in
Chapter 4, “Specifications”.
Example : A pulse train with level 1 V
rms
, is measured on the
1 V range. It has pulse heights of 3 V (that is, a Crest Factor
of 3) and duration 111
µs. The prf can be calculated to be
1000 Hz, as follows:
Thus, from the table above, this AC waveform can be
measured with 0.18 percent additional error.
AC Filter
The multimeter’s AC voltage and AC current functions
implement three low- frequency comb filters. These filters
allow you to trade- off minimum measured frequency for
faster reading speed. The “SLOW” mode filter notch at 2 Hz
and useful for frequencies above 20 Hz. The “MEDIUM” filter
notch at 20 Hz and useful for frequencies above 200 Hz. The
“FAST” filter notch at 200 Hz and useful for frequencies
above 1 kHz.
20000 –1.28% 0.00% –3.07% –8.20% –45.70%
50000
–3.41% –0.04% –6.75% –32.0% –65.30%
100000 –5.10% –0.12% –21.8% –50.6% –75.40%
Tab le 3-3 Typical errors for various pulse waveforms as a function of input pulse frequency (continued)
(continued)
prf
Typical error for square wave, triangular wave, and pulse trains of CF=3, 5, or 10
Square wave Triangle wave CF=3 CF=5 CF=10