Operation
Frequency Measurement
with
External Reference
(Option
1E)
1.
Connect a precision frequency standard signal (must have an accuracy better
than 10 ppm) to BNC connector EXT REF IN, located on rear panel. The
reference signal must be greater than 2 V peak-to-peak into a 50
Q
or 75
Q
load with frequency of
1
MHz, 3.579545 MHz, 4.4336188 MHz, 5 MHz, or
10 MHz.
2.
Select FREQUENCY as described above.
3. After 100 measurements (approximately
1
minute), the frequency readout will
display the applied input signal frequency in 8 digits.
Delay Sweeps by Event
Counts
The Counter/Timer/Trigger (Option 09 or 06) includes delay-by-events for either the
A Sweep or the B Sweep. Event counting begins at a starting event on a vertical
input, defined by the A Trigger. Delay-counting events are defined by the B Trigger. In
addition,
the available Word Recognizer
(WR) can
define either start or delay-counting
events. The combinations available are shown in Table 2-3.
Which
Sweep to
Delay
When the A Sweep is delayed by events, the event count can accumulate
for unlimited time. Then the B Sweep can be delayed by time to magnify
waveform details.
When the B Sweep is delayed by events, the event count must accumulate
during the A Sweep. Then the intensified A Sweep can show the timing
between the start event and the delay count.
2-28 2465B/2455B/2445B Operators
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