Acquiring and Displaying Waveforms
3–22
TDS 500D, TDS 600B, & TDS 700D User Manual
When you select a channel, the horizontal POSITION knob positions all channel,
reference, and math waveforms displayed at the same time when Horizontal Lock is
set to Lock in the Zoom menu. See Zoom a Waveform on page 3–54.
To select the waveform record length and the trigger position, use the Horizontal
menu. You can also use this menu to change the horizontal position or scale
instead of using the horizontal knobs. You can select the delayed time base (see
Delayed Triggering on page 3–117) or choose the frames on the waveform that
you want to see (see Using FastFrame on page 3–67).
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:
TDS 600B Oscilloscopes have standard record lengths up to 15,000 points.
TDS 500D Oscilloscopes have standard record lengths up to 50,000 points.
TDS 700D Oscilloscopes have standard record lengths up to 500,000 points.
With Option 1M and Option 2M, TDS 500D and TDS 700D Oscilloscopes
have record and acquisition lengths of up to 8,000,000 points depending on
the model and option (see Table A–1 starting on page A–1 for more
information). Option 2M is available only at the time of original purchase.
Neither option is available for the TDS 600B models.
To Change Horizontal
Parameters
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