[Elecraft] Initial test - resistance check in KPA100 contradicting measureme

Mon Aug 12 17:14:00 2002

Hi

In circuit resistance measurements will vary somewhat with different bran=
d of meters. The semiconductors in the circuit will modify the resistance=
 measurements and will depend on the driving current the meter using and =
the range selected. You should look for readings way off before any conce=
rn. I would not worry about it. The voltage measurements are more critica=
l and should agree with the manual within a few percent.

Don Brown
KD5NDB =20

----- Original Message -----
From: [email protected]
Sent: Monday, August 12, 2002 3:49 PM
To: [email protected]
Subject: [Elecraft] Initial test - resistance check in KPA100 contradicti=
ng measurement results

Hi,
while measuring the resistances according to page 20 of the KPA 100 manua=
l, I =20
found the following:
while measuring in th 20k range, all resistances that should have been >1=
0k =20
were around 8.3k: U1 pin 2, 3, 13, 14, 27, 28, or U4 pins 1 and 8(too low=
)
When measuring in the 200k range all resistances were in the 35k range, =20
measuring in the 2M range produced measurements of about 250k or, to be m=
ore =20
specific:
DVM range:  20k    2M      20M
U1 pin1         3,7k  3,9k     3,8k
U1 pin2         8k     34k      255k
U1 pin3         8,3k  34,7k    260k
More values upon request but pattern is the same for the rest of the pins=
 of =20
the ICs. Measuring between banded end of D10 and ground as well as measur=
ing =20
between AF pad and gound showed infinite resistance. I am using a Metex =20
M4640A DVM and have replaced the battery of the DVM just ten minutes ago.=
 =20
(thought it might have been a weak battery. Any ideas?
-- =20
Best Regards
Mit freundlichen Gr=FC=DFen
Rolf Schr=F6der

They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety. =20
- Benjamin Franklin, 1759 - =20
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