Tektronix WFM2200A, User Manual, Page: 199 / 276

Alarm Description
Cable Length Based on the Cable Type setting in the CONFIG menu, indicates that the length of the cable (in
meters) connecting the signal source to the instrument exceeds the threshold for acceptable signal
loss (cable loss) for the type of signal connected to the instrument (SD, HD, or 3G).
NOTE. Most serial receivers and cable equalizers are specified in terms of cable length for Belden
8281 or 1694A. To evaluate the margin to those specifications, use 8281 or 1694A as the cable
type and the measured cable attenuation will be scaled as if it was 8281 or 1694A. This allows
direct comparison to the specification. You will need to set the cable type to one that is close to
your actual cable only to measure the physical length of the cable.
Cable Loss Indicates that the signal loss (in dB) due to the cable connecting the signal source to the
instrument exceeds the threshold for acceptable signal loss (cable loss) for the type of signal
connected to the instrument (SD, HD, or 3G).
The threshold is 160 Hz minus the loss at 18 MHz. Cable loss is typically low at low frequencies
and higher at high frequencies. Most SDI receivers have equalization circuits that add high
frequency data to the SDI signal. In equalized eye mode, the instrument allows you to see how the
equalized eye signal of the receiver might appear.
Source Level Indicates that the signal level has exceeded the Source Level Max or Source Level Min amplitude
thresholds as set in the CONFIG menu.
Eye Unlocked Indicates that the Eye circuit cannot lock to the SDI signal input. There is no configurable threshold
for this alarm.
Eye Amplitude Indicates that the Eye waveform amplitude has exceeded the Eye Amplitude Max or Eye
Amplitude Min thresholds (in millivolts) as set in the CONFIG menu for the type of signal
connected to the instrument (SD, HD, or 3G).
Eye Rise Time Indicates that the Eye waveform rise time has exceeded the Eye Risetime Max or Eye Risetime
Min thresholds (in picoseconds) as set in the CONFIG menu for the type of signal connected to
the instrument (SD, HD, or 3G).
Eye Fall Time Indicates that the Eye waveform fall time has exceeded the Eye Falltime Max or Eye Falltime Min
thresholds (in picoseconds) as set in the CONFIG menu for the type of signal connected to the
instrument (SD, HD, or 3G).
Eye Rise Overshoot Indicates that the Eye waveform rise time overshoot has exceeded the Eye Rise Overshoot
threshold (in percentage of Eye waveform amplitude) as set in the CONFIG menu for the type of
signal connected to the instrument (SD, HD, or 3G).
Eye Fall Overshoot Indicates that the Eye waveform fall time overshoot has exceeded the Eye Fall Overshoot
threshold (in percentage of Eye waveform amplitude) as set in the CONFIG menu for the type of
signal connected to the instrument (SD, HD, or 3G).
Eye Rise-Fall Delta Indicates that the delta between the Eye waveform rise time and fall time has exceeded the Eye
Rise-Fall Delta threshold (in picoseconds) as set in the CONFIG menu for the type of signal
connected to the instrument (SD, HD, or 3G).
Table 29: System and diagnostics alarms
Alarm Description
Hardware Fault Indicates that there has been a hardware failure with the instrument and service is required. If this
alarm occurs, power down the instrument and contact your local Tektronix service representative.
Functions
WFM2300 and WFM2200A Waveform Monitors User Manual 177