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HP 203A - Controls and Indicators; Operation; Calibration for 60 Cycle Line; Calibration for Line Frequencies

HP 203A
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Model
203A
Section
Ш
Paragraphs
3-1
to
3-10
SECTION
HI
OPERATION
3-1.
INTRODUCTION.
3-2.
The
Model
203A
generates
two
sine
wave
and
two
square
wave
signals
which
are
available
simul-
tancously
at
the
front
panel
OUTPUT
connectors.
The
output
Signal
frequency
is
determined
by
the
position
of
the
FREQUENCY
dial
and
FREQUENCY
MULTI-
PLIER
switch.
By
the
use
of
the
PHASE
LAG
con-
trol,
the
phase
of
the
VARIABLE
PHASE
OUTPUT
signals
(one
sine
wave
and
one
square
wave)
can
be
continuously
adjusted
from
0°
to
360°
with
respect
to
the
RE
FERENCE
PHASE
OUTPUT
signals.
The
OUT-
РГ
terminals
provide
an
open-circuit
signal
level
of
30
volts
peak-to-peak.
The
individual
AMPLITUDE
controls
provide
40
db
of
attenuation
for
each
output
Signal,
The
CAL
ADJ
control
provides
a
means
of
cali-
brating
the
FREQUENCY
dial
with
the
line
frequency.
3-3.
CONTROLS
AND
INDICATORS.
3-4.
Figure
3-1
describes
the
function
of
all
front
panel
controls,
connectors,
and
indicators.
The
des-
cription
of
each
component
is
keyed
to
a
drawing
which
is
included
within
the
figure.
3-5.
OPERATING
INSTRUCTIONS.
3-6,
Figure
3-2
contains
operating
procedures
keyed
to
a
drawing
included
in
the
figure.
Refer
to
figure
3-1forthe
function
of
each
control
and
paragraph
2-3
for
setting
the
line
voltage
switch.
01760-2
3-7.
CALIBRATION
FOR
60
CYCLE
LINE
FREQUENCY.
3-8.
A
quick
procedure
for
checking
the
calibration
of
the
frequency
dial
is
as
follows:
a.
Set
the
FREQUENCY
dial
to
6
(CAL).
b.
Set
the
FREQUENCY
MULTIPLIER
to
CAL,
(Тһе
pilot
light
will
flicker.
)
с.
Adjustthe
CAL
ADJ
for
minimum
rate
of
flicker.
Note
If
the
flicker
rate
is
not
close
to
mini-
mum,
use
the
Frequency
Calibration
check
paragraph
5-5.
When
the
FREQUENCY
MULTIPLIER
switch
is
in
the
CAL
position,
there
is
no
output
at
the
REFERENCE
PHASE
Л.
OUTPUT
connector.
3-9.
CALIBRATION
FOR
LINE
FREQUENCIES
OTHER
THAN
60
CYCLES.
3-10.
Forline
frequencies
otherthan
60
cps
the
FRE-
QUENCY
dial
is
set
to
1/10
of
the
line
frequency
(40
to
400
eps
line
frequency)
Again
the
calibration
is
made
with
the
front
panel
CAL
ADJ
control,
which
is
-
_
adjusted
for
а
minimum
flicker
rate
of
the
pilot
lamp.
`
For
line
frequencies
above
600
cps
the
FREQUENCY
dial
is
set
to
1/30
of
the
line
frequency
(33.
3
for
a-
1000
cps
line
frequency).
Atthe
higher
line
frequen-
ciesthe
flicker
intensity
decreases
and
the
CAL
ADJ
control
sensitivity
increases.
3-1

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