| Products > Test Equipment |
| Ready-to-use DMM analog front end module? |
| (1/1) |
| jezel123:
Hi everyone I am planning to make a 5 digit bench DMM which uses Nixies for the display. Now, I don't have a lot of experiece when it comes to analog PCB design, and I would like to avoid wasting a lot of time and money on prototypes for the analog front end, so I thought, surely there have to exist some sort of ready-to-use precision DMM modules with simple serial communication, but I cant find any. It is entirely possible that I just don't know the terminology and am searching for the wrong thing. Best thing I found is a Cyrustek ES51997 IC, but I haven't found any reference design for it. Things I want to measure: * Voltage (AC and DC) between 100uV and 240V * Current (AC and DC) between 100uA to 2A * Resistance between 1 Ohm and 10MOhm * Capacitance between few nF up to few mF * Diode Test * Frequencies between a few Hz up to 16 MHz (doesn't have to be precise) Thanks in advance! |
| iMo:
--- Quote from: jezel123 on March 14, 2024, 10:05:01 am ---Hi everyone I am planning to make a 5 digit bench DMM which uses Nixies for the display. Now, I don't have a lot of experiece when it comes to analog PCB design, and I would like to avoid wasting a lot of time and money on prototypes for the analog front end.. --- End quote --- Ready to use analog FE could be get from ADI https://www.eevblog.com/forum/metrology/adi-admx3652-6-digit-20-v-dvm/ It is just an +/-20V FE, all others has to be created by you. Mind 5-6 digits with your above reqs is a pretty difficult project, imho. |
| Kleinstein:
The DMM chip sets are usually made for lower resolution, not really 5 digits. They are build for low power, not high performance. This starts with a relatively low voltage range without a divider. The ES51997 seems to still use a dual slope ADC and would thus have a hard time to push it beyond is intended specs (60000 counts). There may be a different front end chip that could maybe be pushed to the 5 digit (99999 counts) range. I difficulty may be to get those more special chip in small quantety. There was such a board available: https://digilent.com/reference/add-ons/dmm-shield/reference-manual |
| jezel123:
--- Quote from: Kleinstein on March 14, 2024, 10:30:11 am ---There was such a board available: https://digilent.com/reference/add-ons/dmm-shield/reference-manual --- End quote --- I know, that is why I find it surprising that there isn't any alternative to this. |
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