Section V
Paragraphs 5-12 to 5-17
Figure 5-3
STD-8-0089
No.
1
2
3
4
5
6
7
8
Model 465A
Description
-hp- Part No.
Connector, male
1251-0174
Connector, male,
W
/insulator
1251-0175
Lug, terminal, 900
0360-0042
Resistor, 1 M
n ,
1/2 w, 1%
0757-0059
metal film
Washer, into lock
2190-0007
Spacer, 6-32 threaded
0380-0058
Shield
1251-0173
Screw, bind. head, 6-32 x
2470-0001
1/4 inches
Figure 5-3. Shielded Load for Residual Noise Check
5-12. NOISE CHECK.
a. An AC Voltmeter (-hp- Model 33lA) and a
1 megohm shielded resistor (refer to Figure
5-3) will be required for this test.
b. Connect ac voltmeter to Model 465A OUT
PUT; RANGE to .003 V.
c. Set Model 465A GAIN to 40 db.
d. Connect 1 megohm shielded resistor across
Model 465A INPUT.
e . AC voltmeter must read less than 2.5
nw
(or 25 microvolts referred to input).
5-13. ADJUSTMENT AND CALIBRATION
PROCEDURE.
5-14. The following is a complete Adjustment and
Calibration Procedure for the -hp- Model 465A
Amplifier. These operations should be conducted
only if it has previously been established by the
Performance Checks, Paragraph 5-5, that the Model
465A is out of adjustment. Indescriminate adjustment
of the internal controls to "refine" readings may
actually cause more difficulty. If the procedures
outlined below do not rectify any discrepancies
which may exist, and all connections and settings have
been rechecked, refer to Paragraph 5-21, Trouble
shooting Techniques, for possible cause and recom
mended corrective action.
5-15. POWER SUPPLY ADJUST (+45 V).
5-4
a. A DC Voltmeter (-hp- Model 3440A/3445A)
will be required for this test.
b. Set voltmeter FUNCTION to DC; RANGE
to 100.
c. Connect positive lead to + side of C20;
common lead to common. DC voltmeter
should read +45 v (±l v).
d. If not, adjust R32 for proper reading.
5-16. BIAS ADJUST (R15).
a. A DC Voltmeter (-hp- Model 3440A/3445A)
will be required for this test.
b. Set dc voltmeter FUNCTION to DC; RANGE
to 100 V.
c. Connect positive lead to + side of C15;
common lead to common. DC voltmeter
should read +23 v (± O . 5 v).
d. If not, adjust R15 to obtain proper reading.
5-17. 1 MC ADJUST (C5).
a. A Test Oscillator (-hp- Model 651A) and
an AC Voltmeter (-hp- Model 331A) will be
required for this test.
b. Set Model 465A GAIN to 20 db.
c. Connect oscillator OUTPUT to Model 465A
INPUT. Set oscillator frequency to 1 Mc;
adjust output to 1. 0 v rms (use ac voltmeter to
verify).
d. Connect ac voltmeter to Model 465A OUT
PUT.
e. Adjust C5 for ac voltmeter reading of
B.
5 v.
5-18. SERVICING ETCHED CIRCUIT BOARD.
5-19. The -hp- Model 465A has one etched circuit
board. Use caution when removing it to avoid
damaging mounted components. The -hp- part
01775-1
