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| Black Star 4503 GPIB DMM Firmware Question |
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| edpalmer42:
I just picked up a Black Star 4503 DMM. I noticed that the EPROM is labelled "R114-50Hz". Since I live in the land of 60 Hz, is there a "R114-60Hz" firmware version? This unit looks like it was factory-modified for 120 VAC so if a 60 Hz version exists they would have swapped the EPROM, wouldn't they? :-// FYI, I've attached a few pictures. Ed |
| Isad:
I doubt the eprom is even gona make any differenc. Have you ever powerd that thing up. |
| dom0:
--- Quote from: Isad on June 02, 2015, 07:16:59 pm ---I doubt the eprom is even gona make any differenc. Have you ever powerd that thing up. --- End quote --- Not necessarily. The ADC is a MAX134 (3.75 digit DMM chip), which is an integrating ADC, thus it can't really reject 50 and 60 Hz at the same time (which some S/D modulators can, but rejecting just one will always give a deeper notch). The MCU can set a control bit to select which one to reject with the MAX134 (see datasheet). |
| edpalmer42:
--- Quote from: Isad on June 02, 2015, 07:16:59 pm ---I doubt the eprom is even gona make any differenc. Have you ever powerd that thing up. --- End quote --- Yes, I have. It needs to be recalibrated because the Ni-MH battery died, but even so, the DC voltage and resistance readings are quite good. I've also confirmed that GPIB is working. Your comment sounds rather negative. Any experience with this DMM that you'd care to share? Ed |
| santiniuk:
Ed, These meters were used in our lab at work. I have the full manual if you need a copy scanned. |
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