Operating Instructions; Inspection; Controls And Terminals; 230-Volt Operation - HP 202A Operating And Service Manual

Sect. I1 Page 1
2-1 INSPECTION
After the instrument
is
unpacked, the instrument
should be carefully inspected for damage received
in transit. I f any shipping damage
is
found, follow
the procedure outlined in the "Claim for Damage in
Shipment" page a t the back of the instruction book.
2-2
CONTROLS A N D 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 f o r 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,
a r e the OUTPUT terminals. With respect to the
ground terminal each of these outputs has equal
magnitude of signal, but they a r e 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 a r e 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 2 3 0 - V O L T O P E R A T I O N
This instrument is shipped from the factory with
the power transformer p r i m a r i e s 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 s e r i e s
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 a f t e r 30 minutes.