On Mar 30, 2005, at 1:34 PM, Rolf Moberg, OH6KXL wrote:
My own (SN 4759) measurements with external DMM were as follows:
- U2 pint 5 max 3.79 V
- U4 OUT 7.9 V
I understand there is no big difference between 3.80V and 3.79V.
However, when manual asks (page 47) to adjust "R1 for a reading of
3.80V volts" it seems peculiar not to have enough adjustment scale to
achieve or exceed the required voltage.
that was exactly why I was somewhat concerned. I was ALMOST there, but
not quite. It was disconcerting to me that to get almost there, I had
to fully crank the pot to its end stop.
When a manual tells me to adjust to a voltage, I like to be somewhere
in the middle with my pot...otherwise it makes me wonder what I did
wrong. I am still wondering :)
As for the alleged 5-10% tolerance of DMMs that one poster suggested,
I'm skeptical. If they are that bad, then why doesn't the manual say to
adjust to 3.8 volts since the hundredths digit must be totally
meaningless.
In fact, I see that Fluke claims a .3% DC voltage accuracy of their
basic 73/77 multimeters, so thinking the problem lies with my meter
doesn't really cut it for me.
PB
K2 SN 4818
Just getting to the toroids and loving every minute
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