| Products > Test Equipment |
| ET4401/4090A etc., Bench Top LCR Meters Query? |
| (1/1) |
| Chris56000:
Hi! Regarding the East Tec LCR Meters and their 4090A/4090B/4090C clones, has anyone determined exactly all the chips that are employed in these instruments? I know there's one very large QFP device that appears, from all the available pictures I can find, appears to have its number sanded off – has anyone determined what it is? Chris Williams |
| Martin72:
Hi Chris, I´ve started to make a schematic from a ET4410: https://www.eevblog.com/forum/testgear/east-tester-et4410-esr-measure/msg4331890/#msg4331890 There are lots of op-amps and cmos switches there. Pics from the inside: https://www.eevblog.com/forum/testgear/east-tester-et4410-desktop-lcr-meter/msg4002337/#msg4002337 The µC is an ARM STM32.. |
| Chris56000:
Hi! They've clearly not sanded the numbers off on the sample you've posted your pictures from! Could you email me your pictures please Martin? PM sent. Chris Williams |
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