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i
MANUAL CHANGES
MODEL 461A/462A
WIDEBAND AMPLIFIERS
Manual Part No. 00461-90006
• New or Revised Item
CHANGE NO.1:
For Serial Numbers:
461A - 0946A05116 and above.
462A - 0947A016Bl and above.
e. Measure the signal distortion in percentage.
The distortion must be less than 5%.
Revise Figure 5-2 as follows:
Page 64. Change 00461-00203 10 00461-00205.
CHANGE NO.2: For Serial Number 0946A05191 and
above (461A).
CHANGE NO.4 applies to Serial Numbers 0946A05341
and greater for the
Model 461A,
and Serial Numbers
0947AOl721 and greater for the Model 462A.
Page 5·14. Schamatic Note B. Add: R41 10 180 ohm.
Page 6-4. Change the Part Number of the "Insulator for
01" from 1200-0043 to 0340·0580.
Page 5·15/5·16. Change A3R41 and A3R4510 160.
Page 6·3. After A3L4 and A3L5 descriptions, add
"(462A
Only)".
Also add
L4.
L5; 00461-86006;
CoII:Variable 0.1 pH (461A Only).
Page 6·4. Change A3R41 and A3R45 to 0683-1615.160
ohms. (461A Only).
CHANGE NO.3: For All Serial Numbers.
Page 5·3. Change Paragraph 5·10 as follows:
5·10. OISTORTION CHECK (461 A).
CHANGE NO.5 applies to Serial Numbers 0946A05501
and greater for the Model 461A, and Serial Numbers
0947A01751 and greater for the Model 462A.
Page 5·15/5-16. Power Supply (A2) Assembly Schematic.
Change the value of R4 from 5600 to 5100.
Page 6-3, Reference Designator A2 R4. Change Part
Number and Description from 0686-5625, R: fxd comp
5.6 kilohm
± 5%
JhW to 0686-5125, R: fxd 5.1 kilohm
±
5% %W.
Delete the
relative
MFR and
MFR. Part Number
references.
a. Connect the 461 A as shown in Figure
5~2.
CHANGE NO.6 applies to Serial Numbers 0946A05761
and above for the Model 461A.
b. Set the 461A GAIN (DB) switch
to
40.
c. Set the 654A frequency to 500 kHz and
minimum OUTPUT AMPLlTUOE.
Page 6-15/5·16.
On
the schematic diagram change the
followlnq capacitor values:
d. Set the 331 A -to measure RMS VOLTS using
the 1 VOLT METER RANGE. Adjust the 654A
OUTPUT for a 0.5 volt Indication on the 331A
Meter.
Ref. Deslq.
CB.
Cl0
C21. C27. C32
From
2.2 pF
22pF
To
6.8 pF
2.2 pF
DISTORTION ANALYZER
hp
331A
AMPLIFIER
TEST OSCILLATOR
hp
654A
i
00
hp
461A
500 FEEO- THRU
~ I<,~'I
@0(O'
n
@
on
TERMINATION
o@@
hp
1I048C
~
~@
-s-
~©
@
,
$
e
@
CIlIIJ@
o
@
Q
ATTENUATOR. OPTION 40
t~
1KNOWN ACCURACY)
hp
8491A
Figure 5-2.
3 August 1977
Supplement A for 00461:90006
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