[R-390] Ramblings on Calibration - was: HP 8640B

[Cecil Acuff]

Sounds Traceable to me...

Cecil..
----- Original Message ----- 
From: <DJED1 at aol.com>
To: <r-390 at mailman.qth.net>
Sent: Thursday, April 07, 2005 2:29 PM
Subject: Re: [R-390] Ramblings on Calibration - was: HP 8640B


> Boy, you guys put me to shame.   I was going along, setting the R-390A to
> WWV, and thought 100 HZ was close enough.   Then I got the 8660 signal 
> generator
> and figured out how to measure the beat note so I could read frequency to 
> 1 or
> 2 Hz.   Now you tell me that 0.1 Hz is only OK accuracy!   And frequency 
> was
> the one thing I was doing good on- accurate to 1 part in 10^7.   On my
> voltmeters, I was going by the consensus method: if two of them read the 
> same then it
> must be correct.   The trouble was that the two that agreed were a 
> precision
> power supply that I got from a garage sale for $5, and a Radio Shack 
> digital
> VOM from a similar source.   I finally borrowed a calibrated Fluke (0.025%
> accuracy on DC) from my son's shop and verified the the power supply and 
> VOM were
> indeed correct to 0.1%.   Also verified that my H-P 400E was still good to 
> 1%
> on AC volts.   Fortunately, I calibrated my scope to the power supply, so 
> it's
> good.   And I used the scope to set up the URM-25, so it's good.   Now if 
> I
> could only get some precision caps and resistors to calibrate the rest of 
> the
> VOM I'd be all set.
> Ed
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