Model 465A
Section V
Paragraphs 5-1 to 5-8
Figure 5-1
SECTION v
MAINTENANCE
5-1. I NTRODUCTIO N.
5-2. This section contains information necessary for
the proper maintenance of the -hp- Model 465A
Amplifier. This section provides the necessary Per
formance Checks, Adjustment and Calibration Pro
cedures, and Troubleshooting Techniques required to
accomplish the above objective.
5-3. TeST EOUiPMENT REQUIRED.
5-4. The test equipment required to perform the
operations outlined in this section is listed in Table 5-1.
This table describes the type of instrument required,
critical speCifications, type of operation to be con
ducted and the recommended model. If the speCific
model recommended is not available, equipment
which meets or exceeds the critical specifications
listed may be substituted.
5-5. PERFORMA NCE CHECKS.
5-6. The Performance Checks presented in this
section are front panel procedures designed to com
pare the Model 465A with its published specifications.
These operations may be incorporated in period1c
maintenance, post-repair, or incoming quality control
checks. These operations should be conducted before
any attempt is made to adjust or calibrate the instru
ment. During these operations, the Model 465A
power line voltage should be periodically varied±10%.
A fifteen minute warm-up period should be allowed
prior to conducting these checks.
0
0
F REQUENCY RESPONSE
TEST SET
rffj;
739AR
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IjlO 0
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0
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0
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TEST OSCILLATOR
rffj;
651A
0
50- OHM
F EED-THRU
TERMINATION
0
5-7. ACCURACY AND GAIN CHECK.
a. A Test Osciliator (-hp- Model 651A) and an
AC Voltmeter (-hp- Model 3440A/3445A) will be
required for this test.
b. Set Model 465A to 20 db.
c. Connect test oscillator OUTPUT to Model
465A INPUT. Set oscillator, frequency to 1 kc;
adjust amplitude for 1. 00 v rmg output (verify
with ac voltmeter).
d. Connect ac voltmeter to Model 465A OUT
PUT. Voltmeter should read between 9.90 and
10. 1 v. If correct, adjust oscillator output
amplitude for ac voltmet'li' reading of 1. 0 v as
measured at output of 465A. This corresponds
to an input of 100 mv.
e. Switch Model 465A to 40 db. AC voltmeter
should read between 9.90 and 10.1 v.
5-8. FREQUENCY RESPONSE CHECK.
a. Figure 5-1 describes the test arrangemen
f
·
recommended. A Test Oscillator (-hp- Model
651A), a Frequency Response Test Set ( -hp
Model 739AR) and an AC Voltmeter (-hp- Model
331A and 3440A/3445A) will be required. -hp
Model 3440A/3445A will be used for frequencies
from 50 cps to 100 kc; -hp- Model 331A will be
used at all other frequencies.
b. Connect Model 465A as shown in Figure 5-1.
Set GAIN to 20 DB.
c. Set ac voltmeter RANGE to 10 V.
rffj;
465A
AMPLIFIER
A C VOLTMETER
rffj;
3440A 13445A
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0
Figure 5-1. Frequency Response Check
01775-1
5-1
