Model 120B Section I1
Paragraphs 2-1 to 2-9
SECTION II
INSTALLATION
2-1. INCOMING INSPECTION.
2-2. MECHANICAL INSPECTION. Unpack and in- I
spect the Model 120B the in presence of the carrier. T302
Be careful when unpacking the instrument, for all
electron tubes including the cathode ray tube remain
installed during shipment. Save all packing materials
until inspection is complete. These materials may 2
be required for reshipment in the event shipping dam-
age is discovered. 230
VOLTS AC
2-3. Inspect instrument the for signs of possible dam- 3
age in shipment such as scratched panel, broken
knobs, etc. If possible, energize the equipment and
check it operationally paragraph (see 2- 5).
4
2-4. If there are any indications of damage, file a 1L
claim with the carrier. Refer to the Hewlett-Packard 230 VOLT CONNECTION
Warranty sheet at the front of this manual.
2-5. PERFORMANCE CHECK. Paragraph 5-52 con-
tains performance check procedures for verifying
operation within listed specifications. The perform-
ance check is recommended for inclusion receiv- in
ing quality-control inspection. following The proce- I T 302
dure is offered, however, as a means to check basic
operation.
2-6. INITIAL TURN ON. Energize the 120B as
follows: 2
a. Turn INTENSITY control OFF to and plug in
power cable. 115
b. Set SWEEP MAGNIFIER switch to X1 position. VOLTS AC
c. Set HORIZONTAL DISPLAY switch to 0.5 MIL- 3
LISECONDS/CM position.
d. Center HORIZONTAL POSITION and VERTICAL
POSITION controls.
e. Turn 120B on and allow two minutes warmup. 4 :41 LO-S-529
f . Set TRIGGER LEVEL to AUTO.
g. Rotate INTENSITY clockwise until trace appears. 115 VOLT CONNECTION
If crt remains blank, press BEAM FINDER and re-
adjust position controls as necessary.
h. Adjust FOCUS for thin, -well-defined trace, and
adjust HORIZONTAL POSITION to place end left of
sweep on left-end graticule line.
Figure 2- 1. Primary-Power Connections
2-7. POWER REQUIREMENTS.
2-8. The Model 120B requires a power source of 115 2-9. For the protection of operating personnel, the
or 230 volts ?lo%, single phase, 50 to 1000 cps, which National Electrical Manufacturers' Assn (NEMA)
can deliver approximately 95 watts. The oscilloscope recommends that instrument the panel and cabinet
is normally shipped from the factory wired for use be grounded. This instrument is equipped with a
with a 115-volts power source. To convert the in- three-conductor power cable which, when plugged into
strument for use with a 230-volt source, change the an appropriate receptacle, grounds the instrument.
dual primary windings of transformer T302 from a The offset pin on the power cable three-prong con-
parallel combination to a series combination. Figure nector is the ground pin. To preserve the protection
2-1 illustrates the connection for 115- and 230-volt feature when operating the instrument from a two-
operation. At the time of the change, replace the contact outlet, use a three-prong to two-prong adap-
1.5-ampere slow-blow line fuse with 1-ampere slow- ter and connect the green pigtail on the adapter to
blow fuse. ground. |
ACEC
