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341
343A
Model 343
A:
Less
than
(3
ppm
of
setting
+0.1
ppm
of
range
+2
uv) per
°C
from +15°
to
+35°C.
Less than
(5
ppm
of
setting
+0.1
ppm
of range
+2
uv)
per
°C
from 0°
to
+50°C.
STABILITY
OF OUTPUT
The
following
stability
specifications
apply
at
the standard
reference conditions
noted under
ACCURACY OF
OUT-
PUT:
Model
341 A:
1
0V
range (whichever
is
greater)
±0.0007%
of
setting or 5
uv
per
hour
±0.003%
of
setting
or 15
uv
per
month
1
00V
range (whichever
is
greater)
±0.0007%
of
setting
or
1
0
uv
per
hour
±0.003%
of
setting or
25 uv
per
month
1
000V
range (whichever
is
greater)
±0.0007%
of
setting or
20 uv
per
hour
±0.003%
of
setting or
50 uv
per
month
Model 343
A:
10V
range (whichever
is
greater)
±0.0005%
of
setting
or
5
uv
per
hour
±0.001
5%
of
setting
or
1
5
uv
per
month
100V
range (whichever
is
greater)
±0.0005%
of
setting
or 10
uv
per
hour
±0.0015%
of
setting or
25 uv
per
month
1000V
range (whichever
is
greater)
±0.0005%
of
setting
or
20 uv
per
hour
±0.001
5%
of
setting or
50 uv
per
month
OUTPUT CURRENT
0
to
25 milliamps
at
any
output
voltage.
OVERCURRENT
PROTECTION
Automatically
limits
output
current
at
any
present
level
between
1
and
25 milliamps
via
continuously
variable front
panel
control.
Panel
lamp
illuminates
during
limiting.
SHORT-CIRCUIT PROTECTION
At output
voltage
dial settings
of
299 .99X (299.999X on
the
Model 343 A)
or
less,
normal
operation
is
restored
upon
removal of
overload.
At output
voltage
dial
settings
of
300.000 (300.0000
on
the
Model 343A)
or
above,
the
instrument
trips
to
STANDBY
when
the
output
is
short-
circuited.
RIPPLE
AND
NOISE
(all
frequencies)
Model 341A:
60
Hz
Line
-
Less
than
100 uv rms
or
1
mv
p-p.
400
Hz
Line
-
Less
than
100 uv rms
or
2
mv
p-p.
Model 343A:
60
Hz
Line
-
Less
than
50 uv rms
or
400 uv
p-p.
400
Hz
Line
-
Less
than 100 uv rms
or
2
mv
p-p.
SETTLING TIME
Model 341 A:
Within
50
ppm
of
final
output
in 5
seconds.
Model
343
A: Within 25
ppm
of
final
output
in 5
seconds.
LINE
REGULATION
0.0005%
of
setting
+ 25 uv
for a
10%
line
voltage
change
from
nominal.
LOAD REGULATION
0.0005%
of
setting
+
25 uv
for
a
full
load change.
ISOLATION
Either
output
terminal
may
be
floated
up
to
500
volts
dc
from
chassis
ground.
REMOTE
SENSE
Separate terminals
are
provided
for
sensing the
output
vol-
tage directly
at
the load,
thereby
eliminating errors
due
to
voltage
drop
in
the instrument-to-load
connecting
wires.
WARM-UP
TIME
Model 341A:
Within
50
ppm
of
final
output
at
turn-on.
Within
1
5
ppm
of
final
output
in
30
minutes.
Model 343A:
Within 25
ppm
of
final
output
at
turn-on.
Within
5
ppm
of
final
output
in
30
minutes.
INPUT
POWER
115/230
volts
ac
±10%,
50
to
440
Hz,
single
phase.
Approximately
70
volt-amperes
fully
loaded.
1-0.
ENVIRONMENTAL
SPECIFICATIONS
TEMPERATURE
RANGE
Operating:
'
0°
to
+50°C
Storage:
-40°
to
+65°C
Withstands
15
g,
11
millisecond, half
sine
wave
shock
per
MIL-T-212G0.
1-2
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