48 FieldFox User’s Guide
Sweep Time
The fastest possible sweep time is always used as the default setting. Use the Min
Swp Time setting to slow the sweep time when measuring long lengths of cable.
Learn more at the FieldFox Supplemental Online Help:
http://na.tm.agilent.com/fieldfox/help/FieldFox.htm
The actual sweep time is shown on the FieldFox screen. See the Screen Tour on
page 18. To increase the sweep time, enter a value that is higher than the actual
sweep time. The increase will not be exactly the amount that you enter, as the
actual sweep time is the composite of many factors.
NOTE Measurement speed specifications do NOT apply in Temperature Control Mode.
Learn more on page 13.
How to set Sweep Time
Press Sweep 3.
Then Min Swp Time.
Enter a value using the numeric keypad.
Press a multiplier key. Learn about multiplier abbreviations on page 19.
Triggering
External triggering (NA and SA modes ONLY) allows you to initiate a sweep
when an external DC voltage is sensed at the Ref In/Trig In connector on the
FieldFox top panel. See External Triggering for SA Mode on page 94.
Trigger Source
Press Sweep 3
Then Trigger
Then Trig Source
Then choose from the following:
o Internal Sweeps are initiated by the FieldFox internal circuitry. When
Sweep is set to Continuous, a new sweep begins automatically when the
previous sweep ends.
o External A sweep is initiated on the rising or falling edge of an external TTL
signal at the Ref In/Trig In connector on the FieldFox top panel.
o When the FieldFox is armed for an external trigger signal, Wait is
annotated on the display.
o A sweep can NOT be initiated by an external signal while a sweep is in
progress.
o A sweep can NOT be initiated by an external signal when in HOLD mode.
Learn more about HOLD mode on page 47.
Trigger Slope
Determines which edge of an External trigger signal initiates a sweep.
Press Sweep 3
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