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4.
FREQUENCY MEASUREMENT
Input;
Channel
A
Frequency
range;
9902;
DC
to
50
MHz
(direct)
9906;
HF
a.c. coupled;
10
Hz
-
30
MHz
HF
d.c. coupled; d.c.
-
20
MHz
VHF;
10
MHz
-
200
MHz
(prescaled
by
4).
Coupling;
AC
or
DC
Gate
times;
9902;
Manual;
1
ms
to
100s
in
decade
steps
Automatic;
(9902
only)
Gate
times
up
to Is
are selected automatically
to
avoid
overspill
.
A1
kHz
hysteresis
avoids un-desirable range
changing
at
small
frequency
deviations.
9906;
Manual;
HF
-
1
ms
to
100s
in
decade
steps.
VHF
-
4 ms
to
400s
in
decade
steps.
Accuracy;
+
1
count
± frequency
standard
accuracy.
SINGLE
AND
MULTIPLE PERIOD
MEASUREMENT
Input
channel
;
Channel
A
Range;
9902;
1
ps
to
Is
9906;
1
ps
to
100s
Clock
unit;
1
ps
Coupling;
AC
or
DC
Periods
averaged;
1
to
10^
in
decade
multiples
9902
&
9906
Vol
.
1
Tech. Spec.
(4)
Accuracy;
±
0.3%
+
freq. std.
accuracy
Number
of
periods
averaged
+
1
count
(at
50
mV
r.m.s.
ac
input
with
40 dB
S/N
ratio).
Bandwidth;
Automatically reduced
to
10
MHz
(3
dB)
when
on
AC
with Period selected.
6.
TIME INTERVAL
SINGLE
AND
DOUBLE
LINE
Input
channel;
Single
Line;
Channel
B
Double
Line;
Start
Channel
B;
Stop
Channel
A
4
Time
range;
9902;
100
ns to
10
s
(2.8 hours approximately)
9906;
100
ns
to
lO^s (280 hours
approximately)
Clock
100
ns to
10
ms
Coupling;
DC
on
A
channel
AC
or
DC
on
B
channel
Start/Stop
signals;
Electrical or
contact.
Manual
start/stop;
By single push button
on
front
panel.
Trigger slope selection;
Electrical.
Positive or
negative
slopes
can be
selected on both
Start
and
Stop
signals.
Accuracy;
+1
count
+
trigger error
*+
frequency
std
accuracy
.
7.
TIME INTERVAL
AVERAGING
SINGLE
AND
DOUBLE
LINE
Input
channel;
Single
Line;
Channel
B
Double
Line;
Start
Channel
B;
Stop
Channel
A
Time
range;
9902;
150
ns to
0.1s
9906;
1
50
ns to
1
Os
Dead
time
between
150
ns
minimum
intervals;
Clock
unit;
1
00
ns
Time
intervals
averaged;
1
to
10^
in
decade
multiples.
*
For trigger
error
see
page Tech. Spec.
(6).
9902
&
9906
Vol
.
1
Tech. Spec.
(5)
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