Tektronix 2247A

Performance Characteristics
Table 6-1 (cont)
Electrical Characteristics
CHARACTERISTICS
PERFORMANCE REQUIREMENTS
COUNTER/TIMER DEFINITIONS
Frequency of Input, In Hz.
Equivalent frequency (1/T).
Frequency 1.
Frequency 2.
‘B
trigger
sensitivity,
In
divisions
(see
A
and
B
TRIGGER.)
Least
significant
digit.
Number of Input events averaged.
For
non-gated
mode,
N
=
F
X
(0.320
+0.010
s)
For gated mode, N = Ng XG
(N Is always >1)
Number
of
gate
Intervals
In
one
measurement.
(gate
signal
repetition
rate)
X
(GATETIME
0.010 s) 21
GATETIME
=
0.320
s
In
AUTO
RESOLution
mode.
When
a
resolution
magnifier
Is
used,
the
gate
time
Increases
as
needed
to
obtain
the
extra resolution.
Number
of
A
trigger
perlods
averaged
(A
trigger
frequency)
X
(0.320
+0.010
s)
(N Is always 2 1)
Number
of
delta-time
intervals
averaged
in
one
measurement.
(A
sweep
repetition
rate)
X
(GATETIME
+0.010
s)
Number
of
sweeps
In
one
display
sequence
GATETIME
=
0.603
sec
In
AUTO
RESOLution
mode.
When
a
resolution
magnifier
Is
used,
the
gate
time
increases
as
needed
to
obtain
the
extra
resolution.
Number
of
sweeps
Is
found
by
counting
number
of
channels
displayed;
each
channel
with
one
intensified
zone
gets
counted
twice;
If
one
channel
has
both
zones,
this
channel
gets
counted
4
times.
Number
of
trigger
events
inside
one
gate
interval
>
1.
6-22
2247A Operators