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Frequency Response Check; Performance Checks; Accuracy And Gain Check - HP 465A Operating And Service Manual

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Model 465A
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.
F REQUENCY RESPONSE
TEST SET
rffj;
739AR
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TEST OSCILLATOR
rffj;
651A
01775-1
SECTION
MAINTENANCE
0
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0
F EED-THRU
TERMINATION
0
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Figure 5-1.
v
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
recommended.
651A), a Frequency Response Test Set ( -hp­
Model 739AR) and an AC Voltmeter (-hp- Model
331A and 3440A/3445A) will be required.
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
50- OHM
Frequency Response Check
Section V
Paragraphs 5-1 to 5-8
Figure 5-1
A Test Oscillator (-hp- Model
A C VOLTMETER
rffj;
3440A 13445A
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5-1

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