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Accuracy:
8.
RATIO
+
Frequency
standard
accuracy
+
system
error
+
averaging
error
System
error:
10
ns
maximum
per input channel.
This
is
the difference
in
delays
between
start
and
stop signals
and
can be minimised by matching
externally.
Signal
under
measurement
must
not
be harmonically
related
to
the internal
clock.
Averaging
Error:
Trigger
error
+
100
ns
(In ns)
Trigger
Error:
1^
(in ns)
2
X
Signal
Slope
at trigger
point
(V/us)
'(Intervals
Averaged)
Higher frequency
input:
Channel
A
Lower
frequency
input:
Channel
B
Frequency range
9902:
DC
to
50
MHz
(Channel
A);
9906:
DC
to
30
MHz
Reads:
Number
of input
events
+
1
count
n
-
0
Manual
start/stop:
Single push button
on
front
panel
.
Delay
IN:
With Delay
switch
at
IN, both channels are
delayed by approximately
10
ms
from
triggering
(useful for
contact operation).
Electrical start/stop:
By
electrical signal
applied
to
Channel
B.
FREQUENCY STANDARD
Frequency:
5
MHz
Type:
Refer
to
Options 04A,
04B and
04C
on
page
Tech. Spec.
(9).
Normally
04C
will
be
fitted.
Frequency
standard
output:
1
MHz
rectangular
waveform
at rear
panel
BNC
socket.
When
using
internal
standard the output
level
is
TTL compatible (approximately 600
mV
p-p
into
50
Q
Frequency
range
(Channel
B):
DC
to
10
MHz
EXTERNAL
STANDARD
Frequen
cy:
1
MHz
Accuracy;
±
1
count
±
trigger error
on channel
B (see
above)
Input
socket:
Applied
to
channel
B input
socket
and
provides
Reads:
Frequency
A
x
n
external standard
for
Frequency and
Period
Frequency
B
measurement
only.
Multiplier
n;
5
1
to
10
In
decade
multiples.
EXTERNAL SIGNALS
TOTALIZING
Data
outputs:
Eight
digits
with overflow
and decimal
points
in
serial
BCD
form
at
standard
TTL
levels.
Refer
Input
channel
:
Channel
A
(DC
to
10
MHz)
to
Table
1
.
Maximum
rate:
10^
events per second.
Other
outputs:
Function
and
timebase
data.
Refer
to
Tables
2
and
3.
Pulse width:
50
ns
minimum
at trigger
points.
Inputs:
Reset
and
print
hold.
Prescaling:
Events
can be
prescaled
in
decade
multiples
(n)
from
1
to
1
0^.
Accessories:
See Option
01
.
9902
&
9906 Vol
.
1
Tech. Spec.
(6)
9902
&
9906 Vol
.
1
Tech. Spec.
(7)
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