Reference
Bottom Side Description
Positive
Negative
Polarity
Either
Sets the source signal slew rate polarity on which to trigger.
Slew Rate < N
Slew Rate > N
Triggers the
oscilloscope when the signal slew rate is less than or greater
than the specified slew rate N.
Slew Rate = N
Slew Rate ≠ N
Triggers th
e oscilloscope when the signal slew rate is equal to or not
equal to the specified slew rate N within a ±5% tolerance.
Trigger When
Delta Time
N
Shows the delta time component N of the slew rate, as set using the
general purpose knob.
High N
Low N
Sets the signal high threshold and low threshold voltage level components
of the sl
ew rate to v a lue N, using the general purpose knob.
Set to TT
L
Sets the
signal threshold voltage levels to 2.0 V (high threshold) 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 p
age 94.)
Key Points
Delta Time and Thresholds. The delta time and threshold 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. Choose video triggering to trigger on the odd fields, even fields, or
on all the lines of an NTSC, PAL, or SECAM video signal. If installed, see the
user manual for the TDS3VID Extended Video or the TDS3SDI 601 D igital Video
application module for more informa tion. 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 on a SECAM signal.
TDS3000C Series Oscilloscope User Manual 107
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