Racal Instruments 9901 Maintenance Manual page 16

13
.
Average Ageing
Rate:
±
1
part
in
10
per
month
three
months
after
delivery but
less
than
±
1
part
in
10^
in
the
first
year.
Frequency Standard Output:
1
MHz
t.t.l.
compatible rectangular
wave.
EXTERNAL
STANDARD
Frequency:
Input Socket:
14.
EXTERNAL SIGNALS
Data Outputs:
Other
Outputs:
1
MHz.
Applied
to
channel
B input
socket
and
provides
external standard
for
Frequency and
Period
measurement
only.
Eight
digits
with overflow
and decimal
points
in
serial
BCD
form at
standard
t.t.l. levels.
Refer
to
Table
1
on page
(7).
Function
and
timebase data. Schmitt trigger outputs
from both channels.
Inputs:
15.
POWER
REQUIREMENTS
Supply:
Voltage Ranges
(a.c.):
Reset
and
print
hold. (Also refer to
Option
01).
94V
to
265V
r.m.s.,
45
to
450
Hz
a.c.
Eight ranges selected by
transformer
connection
and
link:
94V
to
106
V
106
V
to
119V
118V
to
132V
188V
to
212V
200V
to
225V
212V
to
239V
223V
to
251V
235V
to
265V
Consumption: 20
VA
approximately.
16.
ENVIRONMENTAL
&
SAFETY SPECIFICATIONS
Operating Temperature Range:
0°C to+55°C.
Storage Temperature Range:
Humidity:
Mechanical
:
Safety:
-40°C
to
+70°C.
95%r.h. at+40°C.
In
accordance
with lEC 68.
Meets
I
EC
348 (BS4743)
9901
Vol.2
Tech. Spec.
(5)