Tektronix TDSUSB2 User Manual

Reference Rising Edge Rate
Rising Edge Rate
The Rising Edge R ate in V/us is calculated using the following equation:
Rising Edge Rate = Amplitude/Rise Time
Where:
Amplitude is the difference between the positive and negative thresholds that vary for each of the signaling
rates.
Rise time is calculated using the higher level of th e inner vertical eye height reference levels and is
~80% of the signal amplitude.
This is applicable both to differential and single-ended waveforms.
Signaling Rates
Positive Threshold Negative Threshold
LS 2.8 V/μs0.4V/μs
FS 2.5 V/μs0.8V/μs
HS 0.175 V/μs –0.175 V/μs
xxx
Falling Edge Rate
The Falling Edge Rate in V/us is calculated using the following equation:
Falling Edge Rate = Amplitude/Fall Time
Where:
Amp
litude is the difference between the positive and negative thresholds that vary for each of the signaling
rates.
Fa
ll time is calculated using the Lower level of the inner vertical eye height reference levels and is ~20%
of the signal amplitude.
T
his is applicable both to differential and single-ended waveforms.
S
ignaling Rates
Positive Threshold Negative Threshold
L
S
2
.8 V/μs
0
.4 V/μs
FS 2.5 V/μs0.8V/μs
HS 0.175 V/μs –0.175 V/μs
xxx
186 TDSUSB2 Universal Serial Bus Measurements Package

Tektronix TDSUSB2 Specifications

General

Brand	Tektronix
Model	TDSUSB2
Category	Measuring Instruments
Language	English