User`s guide

Cascade command (View menu) - Arranges windows so they overlap starting in the upper left-hand corner with the
active tool screen being displayed. The title bar of each window tool remains visible allowing easy selection of
any window.
Center Mask Horizontally - This button will center the mask horizontally in the view.
Channel - Select any channel for single channel functions. The default is Chan 1 or Ref 1.
Channel 1 - Select from which channel of the DSM, connected to any Channel In of the instrument, to acquire
measurements.
Channel 2 - Select from which channel of the DSM, connected to any Channel In of the instrument, to acquire
measurements.
Channel Edge - Select Rising or Falling edge for channel-to-channel measurements.
Channel Setup Options button - Configure a particular channel (as chosen by Channel View). You can set Delay
(time), Offset (voltage), and Volts/division.
Channels to Optimize - Select the data channel(s) for the automatic pattern marker placement.
Channel View - Use this pull-down menu to select the channel of the desired signal. This allows you to view
measurements from a specific channel as well as change that channel’s settings.
Channel Voltage - Enter channel voltage trigger level. When Threshold Voltage is set to AUTO, you can use the
channel control to view the threshold voltages derived from PULSEFIND to be used by that channel for a
measurement. Voltages are displayed under Start Voltage, Stop Voltage and Arm Voltage.
When Threshold Voltage is set to USER VOLTS, use the channel control to select a channel and specify or fix the
threshold voltages to be used for the measurement on that channel.
Clear Button - Clears active window of data.
Clear Command (Edit menu) - Clears active tool of any measurements or plots. Toolbar symbol:
Clock Histogram Arm Violation - If the arm mode is 'Arm on Stop' or 'Arm on Start' (Auto Arm) then the software
automatically picks an edge transition, after its internal delay of 4 to 5µs (See Measurement Theory), on the same
signal that it is going to measure as its arm event. If external arm is selected, a transition on another channel
(other than the measurement channel) is used as the Arm for a measurement. Then, after the input delay (19 to
21ns), a measurement is made. If the delay value is very close to an edge that is being measured, misalignment
can occur when jitter on the signal moves the first edge back and forth across the delay interval. The result will be
that the hardware will sometimes see the edge and sometimes it won't.
One example of this situation occurs when a period measurement of a clock is being made and 2 histograms
appear, one of negative values and one of positive values. Another example is when measuring data the dataCOM
software may give an error "Failed DDJ measure – Bad pattern or Signal". In either of these cases, the Arm Delay
can be moved to eliminate this problem.
Clock Recovery Tool Option - The clock recovery option enables signal integrity compliance and diagnostics
measurements when access to a bit clock is not available. The clock recovery option also removes the need for
awkward setups to obtain accurate and repeatable compliant signal integrity measurements - simply plug in your
test signal to make eye diagram and jitter measurements. For more information, see Appendix E or Clock
Recovery Configuration Dialog Box.
Glossary © WAVECREST Corporation 2005
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