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| U1272A update |
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| Floyo:
I just got my cable in the post this morning, DHL high priority air mail. I sent the email June 11th, package was sent the 17th. and it got here today. Not bad especially becouse I'm used to waiting a month or more for stuff to arrive from Asia. Updating the firmware was a piece of cake, so now the hunt for new bugs is on :P |
| Kiriakos-GR:
Floyo did you use the first software updater utility ? or the latest ? and what windows do you use ? ( The truth are that both versions was identical , the latest for some reason it uses an older driver than the first, but comes uncompressed , and you can see the driver uninstaller as separate file) I did not had to use the update, my DMM came all ready updated from the factory. Welcome on the data logging club ;) |
| Floyo:
I think its the latest one, it has to separate folders with the drivers one normal and one for 64 bit vista. But I didn't install the drivers because I already have an usb-rs232 converter for µC projects that uses the same chip. I use win7. |
| saturation:
Accuracy tests on the 1272a are summarized on these graphs. The test 1272a unit meets or exceeds the Fluke 87V in all functions except capacitance. The minimum capacitance it reads accurately is 1nF despite what the manual says; beyond it the accuracy drops markedly and one 1272a , refuses to read below 1nF. For comparison, other known DMM of equal or lesser accuracy are also co-measured to show the tests accuracy is expected of each DMM's published specification. 1272aC is factory calibrated. 1272a was shipped off cal, and was adjusted by me in DC ranges. However, further tests show its also off in AC ranges compared to the factory calibrated unit. This chart is a rank scale of accuracy for each basic DMM function, smaller bars are better. The Agilent 1252a is surprisingly the most accurate of all the DMMs tested, in all ranges ~ almost a factor of 2, see the raw data chart. The 1252a's one weakness is noise in high megaohms scale reduces accuracy reading. The 'busy' chart is a cumulative error for every tested scale; shorter bars are better. The lines follow 2 primary sources of inaccuracy, the capacitance scale on the 1272a and the Vac scale for all DMMs. |
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