HP 83480A User Manual

Increasing Measurement Accuracy
and Time-Interval Measurement
Time-Interval Measurements
Figure 9-2 shows how vertical dc errors aect time-interval accuracy. The
linearity of the instrument is typically better than 1/2 LSB, so the error is
dominated by the oset and gain errors.
Figure
9-2.
Eect
of
vertical
dc
errors
on
measurement
accuracy
.
Time-interval errors
due
to
voltage
errors
cancel
when
you
measure
the
time
between two
edges having
the
same
polarity
,
amplitude
,
oset,
and
slew
rate
at the
same dc
level
on
the
same
channel.
Note
that
this
rule
applies
only
to
single-channel measurements
.F
or
channel-to-channel
measurements
,
the
dc
errors
on
each
channel
could
be
dierent, so
the errors
may not
cancel.
If
the
slew
rates
of
the
edges are
dierent as
in Figure
9-2,
there
may
still
be a time error introduced by the dc level error, though both times are
referenced to the same dc level and both edges have the same amplitude and
polarity.
9-10

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English