Has everyone seen what is needed for performing the Auto Zero on METWEB. I just came out today. It has the parts list and some of the findings from the report submitted to AFMETCAL from DHI. I surely hope that this works for my units.
It should help. You may need, (or want) to optimize the cal on the unit after it's properly zeroed, but it should hold through several intervals.
Once again this is AFMETCAL bending over backwards to please a manufacturer who sold the junk in the first place. Soo, if the manufacturer says you have to do the autozero with the lights turned off, while standing on one foot while holding a duck, thats what will be in the next IOS.
Sick of getting gear from the lowest bidder
Quote from: YodaOnce again this is AFMETCAL bending over backwards to please a manufacturer who sold the junk in the first place. Soo, if the manufacturer says you have to do the autozero with the lights turned off, while standing on one foot while holding a duck, thats what will be in the next IOS.
Sick of getting gear from the lowest bidder
Not sure I follow that one. It has been proven that the autozero performed properly works.....also it has been shown that not doing it works. As I did for two years with approval. Not one adjustment in those two years. The vacuum auto zero wasn't from DHI....it was a spec AFMETCAL wanted.
Yeah, I'm not sure I follow it either, but I have had good success with the autozero using the TO method...before, it was just too vague.
And yes, the autozero at vacuum was in the original AFMETCAL requirements; does not seem like a good idea now, especially with all of our troubles.
I was a K5/K6 technician at Luke AFB for over six years. I now work in repair/calibration department at DH Instruments, Phoenix, AZ. I can say that the reason the PPC2AF Low ranges have to be AutoZeroed (PAZNet) and (PAZTare) with a Vacuum is because AFMETCAL wanted EVERY PMEL to be able to perform the AutoZero. Since every lab does not have a Ruska 2465, but does have a vacuum pump and some sort of manometer or vacuum sensor, that seemed like the best way to AutoZero. The 60 day AutoZero (PAZnet) will work great, ONLY if the PAZT was establised properly for each subrange at the time of calibration adjustment.
I have been using the autozero as per the Afmetcal requirements in TO for over 5 years at 2 different bases, it works great when done this way. I go to 30 microns with large diameter vac tubing and it always works well.