HP 202A Operating And Service Manual
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Sect.
I1
Page 1
2-1 INSPECTION
After the instrument
is
unpacked, the instrument
should be carefully inspected for damage received
in transit.
If
any shipping damage
is
found, follow
the procedure outlined in the "Claim for Damage in
Shipment" page at the back of the instruction book.
2-2
CONTROLS AND TERMINALS
RANGE
This switch
is
used to select the desired frequency
range to be covered
by
the frequency dial.
FUNCTION
This switch
is
used to select any one of the three
types of output waveform.
FREQUENCY
This dial
is
calibrated directly in cycles per second
for the
X1 frequency range of the oscillator. The
knob just below the dial escutcheon
is
directly con-
nected to the frequency varying element. The lower
knob
is
a
mechanical vernier for fine adjustment
of the frequency.
AMPLITUDE
This control adjusts the amplitude
of
the oscillator
voltage admitted
to
the amplifier and, therefore,
the
output
of
.the instrument. This control
is
calibrated
from
0 to 100 in arbitrary units.
POWER
This toggle switch controls the power supplied to
the instrument from the power line.
FUSE
The fuseholder, which
is
located on the panel, con-
tains the power line fuse. Refer to the Table
of
Replaceable
Parts
for the correct fuse rating.
SECTION
II
OPERATING INSTRUCTIONS
OUTPUT
This group consists of three terminals. The one
marked "G"
is
connected directly to the instrument
chassis.
The
other two terminals, vertically aligned,
are the OUTPUT terminals. With respect to the
ground terminal each of these outputs has equal
magnitude of signal, but they are 180" out of phase
with each other. The internal impedance between
the two OUTPUT
terminals
is
appmximately
40
ohms.
SYNC OUT
The Sync Out terminals are single-ended and have
an internal impedance of about 2,000 ohms.
Power Cable
The three-conductor power cable
is
supplied with
a three-prong plug. The third prong
is
a round
off -set pin which provides
a
chassis ground. An
adapter may be obtained to permit use of this plug
with two-conductor receptacles.
2-3 230-VOLT OPERATION
This instrument
is
shipped from the factory with
the power transformer primaries connected in
parallel for
115
v operation, unless otherwise spec-
ified
on
the order.
If
230 v operation
is
desired,
the
primaries will have to be connected in series
as
shown in "Transformer Details" on the schematic
wiring diagram
of
the Power Supply Section.
2-4 OPERATION
The following step-by-step procedure should
be
used
as
a
guide when operating this instrument.
1) Turn the POWER switch
to
ON. Allow thirty
seconds for oscillations to start. The instrument
will operate nearly within specifications after
a
few minutes warm-up.
It
will
be within specifi-
cations after
30
minutes.