User`s guide

Triggering 4
InfiniiVision Oscilloscopes User’s Guide 127
• Decreasing value — similar to the description above except the trigger occurs on a
descreasing data word value, and the “Armed” value is the value to which the data
must rise in order to re-arm the trigger.
21 Press the Base softkey and select a number base for entering data values:
• Binary (2’s complement).
When Binary is selected, the Bits softkey appears. This softkey opens the I
2
S Bits
Menu for entering data values.
When the trigger qualifier requires a pair of values (as with In Range, Out of Range,
Increasing value, or Decreasing value), the first softkey in the I
2
S Bits Menu lets
you select which value of the pair.
In the I
2
S Bits Menu, press the Bit softkey and rotate the Entry knob to select each
bit; then, use the 01X softkey to set each bit value to zero, one, or don’t care. You
can use the Set all Bits softkey to set all bits to the value chosen on the 01X
softkey.
• Signed decimal.
When Decimal is selected, the softkey(s) to the right let you enter decimal values
with the Entry knob. These softkeys can be Data, <, >, or Threshold depending on
the selected trigger qualifier.
22 If the setup does not produce a stable trigger, the I²S signal may be slow enough that
the oscilloscope is AutoTriggering. Press the [Mode/Coupling] key, then press the
Mode softkey to set the trigger mode from Auto to Normal.
NOTE
To display I
2
S serial decode, see page 310.