GRATTEN GA1022CAL, Руководство пользователя

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 A signal with DC component or offset will cause error or offset of an FFT waveform
component. An AC coupling mode can be selected to reduce DC components.

DBVrms vertical scale can be used for displaying the FFT waveform within a large dynamic
range, and this scale displays the vertical amplitude at a logarithm mode.

Nyquist Function: Reconstruction of the waveform needs to adopt a sampling rate that is
double of the input frequency.
2.5.4 Implementation of REF function
During actual measurement, the waveform can be compared with the reference
waveform so as to judge failure causes. This method is particularly applicable at a
condition that detailed circuit working point reference waveforms are provided.
Table 2-11: REF function menu:
Option Setup Description
Signal source
CH1
CH2 Select the waveform for saving
REF A
REF B Select the reference of the saved or recalled
waveform
SAVE
Save the signal source waveform in a selected
reference position
REF A/REF B
RUN
STOP Display the standard waveform
Stop the standard waveform
Press [REF] to display the reference waveform menu, as shown in figure 2-22:
Figure 2-22 Reference waveform menu Figure 2-23 Reference waveform
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