Tektronix TDS5032, Manual

Page: 41 / 248

Operating Basics
Table of Measurements and Options
Low Speed and Full Speed Measurements
Table 4. Low and Full Speed measurements
Area Option Description
Signal Quality Check Eye Diagram Checks whether the USB signal is aligned with its corresponding eye
diagram
Signal Quality Check Signal Rate Measures the inverse of the average bit-time that gives the transmission
rate of the USB signal
Signal Quality Check Paired JK Jitter Measures the jitter time for paired (JK next to KJ) differential data transition
Signal Quality Check Paired KJ Jitter Measures the jitter time for paired (KJ next to JK) differential data transition
Signal Quality Check Consecutive Jitter Measures the jitter at every consecutive data bit calculated using the signal
rate
Signal Quality Check EOP Width Measures the width of the end-of-packet of a USB signal
Signal Quality Check Cross-Over voltage Measures the voltage at which the D+ voltage crosses the D– voltage
Signal Quality Check Rising Edge Rate
Measures the Rising Edge/Slew rate in V/
μ
s and is calculated using the
Rise time as Rising Edge Rate = Amplitude / Rise Time
Where Amplitude is the peak-to-peak amplitude for the corresponding
signaling rate and the Rise time is calculated based on the high level of the
inner vertical eye height reference levels
Signal Quality Check Falling Edge Rate
Measures the Falling Edge/Slew rate in V/
μ
s and is calculated using the
Fall time as Falling Edge Rate = Amplitude / Fall Time
Where Amplitude is the peak-to-peak amplitude for the corresponding
signaling rate and the Fall time is calculated based on the lower level of the
inner vertical eye height reference levels
Inrush Current Check Inrush Current Measures the amount of electrical charge drawn by a device as soon as it
is connected to a USB network
Droop Test Droop Test Measures the difference in the VBUS voltage when the load switch is open
to the lowest value of the voltage and the load switch
High Speed Measurements
Table 5. Low and Full Speed measurements
Area Option Description
Signal Quality Check Eye Diagram Checks whether the USB signal is aligned with its corresponding eye
diagram
Signal Quality Check Signal Rate Measures the inverse of the average bit-time that gives the transmission
rate of the Test_Packet
Signal Quality Check Monotonic Property
Detects when the Signal is Monotonic if and only if data [i+1]
≥
data [i] in
case of consistently increasing (rising slope), never decreasing data [i+1]
≤
data [i] when consistently decreasing (falling slope) and never increasing in
value where i ranges from 0 to n
Signal Quality Check EOP Width Measures the width of the end-of-packet pattern of a Test_Packet
Signal Quality Check Rising Edge Rate
Measures the Rising Edge/Slew rate in V/
μ
s and is calculated using the
Rise time as Rising Edge Rate = Amplitude / Rise Time
TDSUSB2 Universal Serial Bus Measurement Package 27