Tektronix 2247A

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Re
Operators Familiarization
X10
RESOL—When
selected,
the
C/T
will
make
one
trial
measurement
using
the
fixed
measurement
time
Interval,
and
calculate
and
display
as
many
fully-resolved
digits
as
possible.
Based
on
the
results
of
this
measurement,
it
Is
determined
whether
or
not
another
digit
of
reso-
lution
is
possible.
It
Is
possible
if:
1.
The
number
of
digits
displayed
after
the
trial
measurement
Is
at
least
1
less
than
the
maximum
number
of
digits
displayable
for
that
measurement,
and:
2.
If
PERIOD
measurement,
the units
of
the
least-significant
digit
(LSD)
are
larger
than
100
attoseconds
(100
X
10-"'®sec),
or
if
any
other
time-interval
measurement,
the
units
of
the
LSD
are
larger
than
1 picosecond
(10~'?
sec).
If
It
ls
not
possible,
the
message
“NOT
POSSIBLE
--->"
is
displayed
to
the
left
of
the
X10
RESOL
menu
label
for
approximately
one
second,
then
the
X10
RESOL
label
is
deselected
and
the
AUTO
RESOL
label
Is
selected
(underlined),
and
the
measurement
proceeds
In
auto
reso-
fution
mode.
If the selected mode Is possible, the measurement time Interval
required to get one more fully-resolved digit Is calculated. If this time Is
greater
than
5
seconds,
the
message
“MEASMT
TIME
XXXXs"
Is
displayed
to
the
left
of
the
X10
RESOL
label,
where
XXXxX
Is
this
measurement time Interval in seconds. If this time Interval is greater
than 9999 seconds, the message “MEASMT TIME >9999s" Is displayed
Instead. The measurement then proceeds using this new measurement
time interval.
X100 RESOL—When selected, the C/T will make one trial measure-
ment using the fixed measurement time Interval, and calculate and
display as many fully-resolved digits as possible. Based on the results
of this measurement, It is determined whether or not two more digits
of resolution are possible. It Is possible if:
1. The number of digits displayed after the trial measurement Is at
least 2 less than the maximum number of digits displayable for that
measurement, and:
2. If PERIOD measurement, the units of the least-significant digit
(LSD) are larger than 1 femtosecond (1 X 107 'Ssec), or If any other
time-interval measurement, the units of the LSD are larger than 10
plcoseconds (10 X10~'*sec).
If It ls not possible, the message “NOT POSSIBLE —» " Is displayed
to the left of the X100 RESOL menu label for approximately one
second, then the X100 RESOL label Is deselected and the X10 RESOL
2247A
Operators
3-29