Instructions

Time accuracy for pulse
width triggering
± 2 ns
Pulse-Width trigger modes < (Less than), > (Greater than), = (Equal), ≠ (Not
equal)
Pulse width trigger edge
Falling edge for positive polarity pulse.
Rising edge for negative polarity pulse.
Pulse width range 33 ns ≤ width ≤ 10 seconds
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, Tektronix provides an arbitrary
guardband. Any measured pulse width within the
guardband will qualify. If you are 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
330 ns < 1: ±5% ≤ guardband < ±(5.1% + 16.5 ns)
165 ns < 1 < 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, Tektronix provides an arbitrary
guardband. Any measured pulse width outside the
guardband will qualify. If you are 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.
Pulse-Width trigger point Equal: The oscilloscope triggers when the trailing
edge of the pulse crosses the trigger level.
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 the time out trigger): The
oscilloscope triggers when a pulse continues longer
than the time specified as the Pulse Width.
Specifications
TBS1000 Series Oscilloscopes Series Digital Storage Oscilloscope Technical Reference 9