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The
B
oat
A
nchor
M
anual
A
rchive

Path: /hp/427a/

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00readme:

Manual for HP 427A meter.  Compliments of A. B. Bonds.

Note from A. B.:

The HP427A is (gasp) sand-state, but is a very 
common general test meter that is often available for $5 or $10 and, once 
fixed up, I have found it to be a very accurate and reliable meter.  The 
analog feature is of course essential for aligning boatanchors, which is 
the tie-in if there has to be one.  Nearly every one of these that I have 
found requires replacement of R13, a 10.15 ohm resistor on the ohms range 
switch.  This is because some meathead has tried to put volts into the 
meter when it is on the ohms range.

73
A. B. Bonds

Files:

427a.pdf
(730 KB)
HP 427A Voltmeter.pdf
(3 MB)