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Acquiring and Displaying Waveforms
TDS 500C, TDS 600B, & TDS 700C User Manual
3–21
Trigger Position. The trigger point marks time zero in a waveform or acquisition
(in Extended Acquisition mode) record. All record points before the trigger event
make up the pretrigger portion of the record. Every record point after the trigger
event is part of the posttrigger portion. All timing measurements in the record are
made relative to the trigger event. To define the trigger point position:
Press HORIZONTAL MENU ➞ Trigger Position (main) ➞ Set to 10%, Set
to 50%, or Set to 90% (side), or use the general purpose knob or the keypad to
change the value.
Record Length. The number of points that make up the waveform record is
defined by the record length. To set the waveform record length:
1. Press HORIZONTAL MENU ➞ Record Length (main). Select the record
length desired from the side menu. Press –more– to see additional choices:
H All TDS 500C, TDS 600B, and TDS 700C Oscilloscopes provide
standard record lengths of 500, 1000, 2500, 5000, and 15000 points.
H For instruments shipped with Option 1M, the TDS 500C and TDS 700C
Oscilloscopes provide additional extended record lengths up to 500,000
points, depending on the model. For specific record lengths available,
see the 1M option in the Table A–1 on page A–2. Option 1M is available
only at the time of original purchase and is not available for the
TDS 600B models.
NOTE. TDS 500C and TDS 700C Models: Hi Res acquisition mode requires
twice the acquisition memory of other acquisition modes. Therefore, the
maximum record length available is 15,000 points without option 1M and 50,000
points with option 1M. Turning Hi Res on switches the setting for record length
accordingly, thereby keeping the oscilloscope from running out of memory.
H For instruments with Option 2M, the oscilloscopes provide extended
acquisition lengths up to 8 M points, depending on the model. For
specific Acquisition lengths available, see the 2M option in Table A–1
on page 0–1. Option 2M is available only at the time of original
purchase and is not available for the TDS 600B models.