Re: HP calibration resistor out of spec
- From: "carneyke" <carneyke@xxxxxxxxxxxx>
- Date: 27 Apr 2006 04:33:42 -0700
Joerg,
The HP909A is a very old termination, possibly it didn't come with the
4191 ? If it came with the 4191 it would have a 04191-85301 sticker on
it too. We had some very old 909A's that were used with the 1960's HP
tunnel diode pulsers. If I remember, they were around 52 Ohms and not
as precise as the 909C that came with the 4191 accessory kit. Take
Care, Kevin
Joerg wrote:
Hello Folks,
This was a surprise. Did the usual calibration ritual on the HP4191.
Then a sanity check with precision parts and, oops, it's off. Turned out
the 50ohm cal resistor "HP909A" is high, 52.5ohms instead of 50.
Ok, it's over 20 years old by now but considering that it is a really
expensive precision machined sealed unit with gold cover and all I
thought this ain't supposed to happen. Or is it?
Regards, Joerg
http://www.analogconsultants.com
.
- References:
- HP calibration resistor out of spec
- From: Joerg
- HP calibration resistor out of spec
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