SFRA45 User Manual
12-2
Selecting ‘falling edge’, sets the oscilloscope to start the
sweep when the trigger voltage goes negative.
Pre-trigger –
Has four options: ‘
none
’, ‘
25%’, ‘50%
’ and
‘
75%
’. This determines the amount of pre-trigger or
waveform display delay based on the mark/space ratio
time of the waveform. ‘None’ has no pre-triggering and
therefore the waveform starts at the beginning of the
trace. ‘25%’ has a pre-trigger time of a quarter of the
mark/space ratio time, so the triggering edge of the
waveform is displayed after the trace starts by 25% of the
mark/space ratio time. This is also applicable for 50% and
75% depending on the pre-trigger time required.
Traces –
Traces has three options: ‘
single
’,
“dual” and
“ch2 current”.
This selects either single or dual trace input
voltage operation. However, in ch2, this will show the
current waveform developed across the generator shunt.
