HP 54710A - Page 396

Sample rate
The rate at which
the acquisition system samples a
waveform. In the real-time mode, all
samples in a given waveform record
are taken from one trigger event and
are evenly spaced in time at a
distance of 1/sample rate. In the
equivalent-time mode, a waveform
record is built up by interleaving
samples taken from multiple trigger
events. This process allows samples
in the waveform record to be spaced
more closely together for repetitive
waveforms. As a result, the
waveforms appear to have been
sampled at a much higher rate,
sometimes referred to as an effective
sample rate. The effective sample
rate is record length/time length of
the record. This is the same as
1/(time between the sample points).
Scale (channel)
Channel scale
controls the vertical scaling of
displayed waveforms.
Scale (time base)
Time base
scale controls the horizontal scaling
of displayed waveforms. Time base
scale is often referred to as sweep
speed in other oscilloscopes.
Skew
Skew changes the horizontal
position of a waveform on the
display independent of any other
waveforms on the display. The time
base position control moves all of the
waveforms on the display at the
same time, whereas skew moves
individual waveforms. Skew is
typically used for overlaying
waveforms, or eliminating timing
difference caused by diverse cable
and probe lengths.
Slot
There are four slots on the
front of the oscilloscope used for
plug-ins. At the back of each slot is
a channel connector, a trigger
connector, and a 25-pin connector.
State triggering
State triggering
is an edge qualified, pattern trigger.
A trigger event occurs if a 3-bit
pattern is present when an edge
occurs on the designated clock
waveform.
Text verbose
An ASCII text file
format that uses alphanumeric
characters to represent a waveform.
This format includes header
information about the waveform and
when it was acquired. The text file
formats are a convenient method for
transferring waveforms to desktop
publishing programs.
Text Y values
Similar to the text
verbose file format, except that the
header information is deleted from
the beginning of the file.
Glossary
Glossary-5