Products > Test Equipment
Agilent U1602B DSO Teardown
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threephase:
Some pictures of the insides of U1602B Scope.

Two machine screws hold the battery pack in place and then another 6 machine screws hold the back half of the case to the front. None of these screws were found to be captive within the case. The back half of the case does not contain any electronics, even the battery connector is mounted onto the PCB and sticks through the back case.





With the back cover removed, the first PCB is held in place with four machine screws. A ribbon cable from the display unit also needs to be unplugged. The board is then connected to a number of header connectors in various places.



A small section of board with what looks like an isolation slot around it houses an ATMEGA64L-8AU 8 bit microcontroller and a TransDimension UHC124B USB controller.





threephase:
Flipping this board over reveals a lot more. I did not remove the shield as it was soldered in place.



The DMM input jacks are connected right onto this board, it may be viewed as a weak point, but I have not had any issues with them over the last years, although its use as a DMM will be quite light.



There are some selection relays plus a couple of PTCs next to the DMM input, the DSO has a 300V CAT III rating on the input DMM. I also noticed a little coin cell just above them, presumably for time clock backup?



The Samsung chip just by the coin cell I believe to be a 64MB SDRAM, just out of focus above that is an M29DW323DB Flash Memory

Opposite side of the input jacks there are a couple of BTC BM6 Chips that I haven't been able to identify yet.



threephase:
There is a second board underneath the first. This is held in place by four self tapping screws into the front half of the case. This board houses the oscilloscope input channels



Flipping this board over and you find the main processor with a label conveniently placed over it identifying the revision.



There looks to be some more RAM on this board in the form of a IC16LV12816 along with an AT89C51 8 bit microcontroller from Microchip.






threephase:
Removing this second board leaves just the PCB for the Keypad and the display in place. I decided not to go any further any remove any of these.





I'll just show a picture of the battery pack and the power supply jack that is slightly elongated. At 8 years old, it looks like the pack finally needs to be replaced as it only powers the instrument for a couple of minutes now.



edited to show missing picture

Thanks for reading

colorado.rob:
I always appreciate a good teardown.  Thank you!

But for those of us who know nothing about this product, a few pictures of the assembled device and a brief summary describing what it is would be helpful.  All I know is that it is a DSO, the name "Agilent" suggests its a decade old, and the pictures indicate it may be portable.
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