Reference
Bottom Si de Description
High N
Low N
Sets the sign al high threshold and low threshold
voltage level components of the slew rate to
value N, using the g eneral purpose knob.
Set to TTL Sets the signal threshold voltage levels to
2.0 V (high thre sh old) and 0.8 V (low threshold).
Thresholds
Set to ECL Sets the signal threshold voltage levels
to -1.1 V (high threshold) and -1.5 V (low
threshold).
Mode &
Holdoff
The table on Edge triggering includes a
description of this menu item. (See page 114.)
Key Points
Delta Time and Thresholds. The delta time and t hreshold settings
determine the calculated slew rate (volts ÷ time). Changing either value
changes the calculated slew rate.
Trigger When. The delta time component of the slew rate (time from
threshold to threshold) must be ≥5 ns in order for the oscilloscope to
detect the slew rate.
Video Trigger
Push the Trigger Menu button, and then push the Type bottom screen
button to select Video. Choo se vid eo triggering to trigger on th e odd
fields, even fields, or on all the lines of an NTS C , PAL, or SECAM
video signal. If installed, see the user manu al for the TDS3VID
Extended Video or the TDS3SDI 6 01 Digital Video application module
for more informatio n. The next table lists the menu items when the
trigger Type is set to Video.
Bottom Side Description
525/NTSC Triggers on a NTSC signal.
625/PAL
Triggers on a PAL signal.
Standard
SECAM Triggers o n a SECAM signal.
TDS3000C Series O scilloscope User Manual 131
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