Agilent Technologies InfiniiVision 5000 Series User Manual page 126

4
Triggering
126
20 Press the Trigger softkey and choose a qualifier:
• Equal — triggers on the specified audio channel's data word when it equals the
specified word.
• Not equal — triggers on any word other than the specified word.
• Less than — triggers when the channel's data word is less than the specified
value.
• Greater than — triggers when the channel's data word is greater than the
specified value.
• In Range — enter upper and lower values to specify the range in which to trigger.
• Out of Range — enter upper and lower values to specify range in which trigger will
not occur.
• Increasing value — triggers when the data value is increasing over time and the
specified value is met or exceeded. Use the Trigger softkey in this menu to set the
data value that must be reached. Use the Armed softkey to set the value to which
the data value must fall before the trigger circuit is re-armed (ready to trigger
again). The Armed control reduces triggers due to noise.
This trigger condition is best understood when the digital data transferred over the
2
I S bus is considered in terms of representing an analog waveform. The figure
below shows a plot of sample data transmitted over an I
this example, the oscilloscope will trigger at the 2 points shown since there are two
instances in which the data increases from a value below (or at) the "Armed" value
to a value greater than (or equal to) the specified "Trigger" value.
If you select an "Armed" value that is equal to or greater than the "Trigger" value,
the "Trigger" value will be increased so that it is always greater than the "Armed"
value.
"Trigger" value
"Armed" value
Trigger Trigger
InfiniiVision Oscilloscopes User's Guide
2
S bus for one channel. In
No trigger