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Display Time:
Gate
time
plusO.lSs
in
Frequency,
Period
and
Ratio
modes.
1
.5s in
other
modes.
A
switched hold
position
is
provided
.
Measurement Check:
Counter
reads
1
MHz.
Segment
Check;
Sets display
1
.e.d
.
's
to
8
when Check
and
Reset selected.
Reset;
Manual by
push-button,
or
automatic.
CHANNELA
INPUT
-
A.C.
COUPLED
Frequency
range;
9902:
10
Hzto50Mhz
9906:
10
Hz
to
200
MHz
Sensitivity;
9902:
lOmV
r.m.s.
(variable
by
sensitivity
control).
9906:
lOmV
r.m.s.
to
150
MHz, 50mV
r.m.s
to
200
MHz
(variable
by
sensitivity
control).
Maximum
signal level
250V
r.m.s.
up
to
10
kHz
50V
r.m.s. up
to
100
kHz
lOV
r.m.s.
above
100
kHz
Maximum
input
level:
The
d.c.
level
+
peak
signal level
must not
exceed
400V
over
the
full
frequency
range.
Input
impedance:
IMO
in
parallel
with
approximately 25pF
falling to
lOOkQ
at
4V
r.m.s.
with
sensitivity
control
in
lOmV
position.
CHANNEL
B
INPUT
-
AC
COUPLED
Frequency
range:
9902:
lOOHz
-
10
MHz
9906:
10
Hz
-10
MHz
Sensitivity:
lOOmV
r.m.s.
9902
&
9906
Vol
.
1
Tech. Spec.
(2)
CHANNEL
B
INPUT
-
AC
COUPLED
(Continued)
Maximum
Signal Level:
9902:
70V
r.m.s. up
to
8MHz,
decreasing
to
60V
r.m.s.
at
lOMHz.
9906;
lOOV
r.m.s. up
to
IMHz,
decreasing
to
36V
r.m.s.
at
lOMHz.
Maximum
Input Level;
The
d.c.
level
+peak
signal level
must not
exceed
1
OOV
(9902) or
200V
(9906)
over
the
full
frequency range.
Input
Impedance:
9902:
lOkQ
in parallel
with 25pF, approx.
9906;
lMf2
in
parallel
with 25pF, approx.
Pulse duration:
25
ns
minimum
at
trigger points.
Delay
IN:
The
Stop
channel
is
delayed
from
triggering
by
approximately
10 ms
after triggering
by
the
Start signal
.
(DELAY
switch
set to
IN).
CHANNELS A
&
B
-
D.C.
COUPLED
Frequency
range:
DC
to
20MHz
on
A
channel
.
DC
to
lOMHr
on
B
channel
.
Sensitivity:
Maximum
input level
Delay
IN:
Pulse duration;
Input
impedance;
±
0.15V
about -t0.8V nominal
.
9902:
±
lOOV
up
to
8MHz,
decreasing
to
443Vat
20MHz
(signal plus
d.c.
level
=
lOOV
maximum
over
full
frequency
range).
9906:
±
140V
up
to
IMHz,
decreasing
to
+28V
at
20MHz
(signal
plus
d.c.
level
=
140V
maximum
over
full
frequency
range).
The
Stop
channel
is
delayed
from triggering
by
approximately 10 ms
after triggering
by
the
Start
signal.
(DELAY
switch
set
to
IN).
25
ns
minimum
at trigger points.
9902:
lOkn
in parallel
with
25pF
approximately.
9906:
1
MQ
in
parallel
with
25pF
approximately,
falling to
lOOkO
at
± 5V.
9902
&
9906
Vol
.
1
Tech
.Spec.
(3)
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