Tektronix TDS2000C series User Manual page 136

Appendix A: Specifications
Table 5: Trigger Specifications (cont.)
Characteristic Description
Video Trigger Sensitivity, A 2 division composite video signal will have a 0.6 division sync tip.
typical
The typical sensitivities are as follows:
Source
Input Channels
EXT
EXT/5
Video Trigger Formats Field rates:
and Field Rates
Line rates:
Trigger Hold Off Range 500 ns minimum to 10 s maximum
Pulse Width Trigger < (Less than), > (Greater than), = (Equal), ≠ (Not Equal)
Modes
Pulse Width Trigger Equal: The oscilloscope triggers when the trailing edge of the pulse crosses the trigger level.
Point
Not Equal: If the pulse is narrower than the specified width, the trigger point is the trailing edge. Otherwise, the oscilloscope triggers when
a pulse continues longer than the time specified as the Pulse Width.
Less than: The trigger point is the trailing edge.
Greater than (also called time-out trigger): The oscilloscope triggers when a pulse continues longer than the time specified as the
Pulse Width.
Pulse Width Range 33 ns ≤ width ≤ 10 sec
Pulse Width Resolution 16.5 ns or 1 part per thousand, whichever is larger
Equal Guardband t > 330 ns: ±5% ≤ guardband < ±(5.1% + 16.5 ns)
t ≤ 330 ns: guardband = ±16.5 ns
All pulses, even from the most stable sources, have some amount of jitter. To avoid disqualifying pulses that are intended to qualify but
are not absolutely correct values, we provide an arbitrary guardband. Any measured pulse width within the guardband will qualify. If
looking for pulse width differences that are smaller than the guardband width, offsetting the center should allow discriminating differences
down to the guardband accuracy.
Not Equal Guardband t > 330 ns: ±5% ≤ guardband < ±(5.1% + 16.5 ns)
165 ns < t ≤ 330 ns: guardband = -16.5 ns/+33 ns
t ≤ 165 ns: guardband = ±16.5 ns
All pulses, even from the most stable sources, have some amount of jitter. To avoid disqualifying pulses that are intended to qualify but are
not absolutely correct values, we provide an arbitrary guardband. Any measured pulse width outside the guardband will qualify. If looking
for pulse width differences that are smaller than the guardband width, offsetting the center should allow discriminating differences down to
the guardband accuracy. Not equal has slightly better ability to deal with small pulse widths than equal. The accuracy is not better.
Trigger Frequency Counter
Frequency Counter 6 digits
Resolution
Frequency Counter ±51 parts per million including all frequency reference errors and ±1 count errors
Accuracy (typical)
Frequency Counter AC coupled, 10 Hz minimum to rated bandwidth
Frequency Range
Frequency Counter Pulse width or edge selected trigger source
Signal Source
Frequency counter measures selected trigger source at all times in pulse width and edge mode, including when oscilloscope acquisition is
halted due to changes in run status, or acquisition of a single shot event has completed.
The frequency counter does not measure pulses that do not qualify as legitimate trigger events.
Pulse Width mode: Counts pulses of sufficient magnitude inside the 250 ms measurement window that qualify as triggerable events (e.g.
all narrow pulses in a PWM pulse train if set to < mode and the limit is set to a relatively small number).
Edge Trigger mode: Counts all pulses of sufficient magnitude.
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Typical Sensitivity
2 divisions of composite video
400 mV of composite video
2 V of composite video
50 Hz to 60 Hz
15 kHz to 20 kHz (NTSC, PAL, SECAM)
TDS2000C and TDS1000C-EDU Series Oscilloscope User Manual