FLUKE 8050A

[lionelkjh]

Hi there! I am trying to identify the following integrated circuit: SL62516, it is mounted on the RMS converter of the FLUKE 8050A (see photo).... Thank you for your precious help

[coromonadalix]

maybe  the 8860a  used the same rms converter    search for the service manual

https://elektrotanya.com/fluke_8860a_sm.zip/download.html#dl

[MikeK]

And the schematic for the 8050A doesn't show that individual IC, but shows the entire module as "U32 Hybrid RMS Converter":

https://xdevs.com/doc/Fluke/8050A/

[Andy Watson]

The logo is National Semiconductor, but nothing appears by that part number in their databooks. Probably a specially selected piece labelled with a house part number?

Conssensus seems to be that it's a dual op-amp.

https://www.eevblog.com/forum/chat/fluke-8050a-473777/msg456624/#msg456624

https://www.eevblog.com/forum/chat/fluke-8050a-473777/msg80651/#msg80651

https://www.eevblog.com/forum/repair/fluke-8050a-true-rms-u32/msg626439/#msg626439

[lionelkjh]

Good evening; thanks for your feedback everyone!

[Andy Watson]

I have just cracked-open a 8010A. It contains a similar RMS hybrid (possibly an earlier version) with a 473777, however, it has a Signetics logo.

Looking at the service manual for the 8860A, moduel A4 AC/DC Scaling PCB Assembly BOM (page 5-18 on my copy, but YMMV), it gives U19 as:
U19 IC, LIN, SELECTED  473777 89536 473777

Looking at the service manual for the 732A voltage standard (module A5 Reference PCB Assembly BOM, page 5-20, but again YMMV), lists U3:
U3 IC, LIN, OP-AMP, DUAL COMPENSATED 473777 12040 LM358N

I conclude that it's an LM358 - possibly selected for tolerence.

[MikeK]

That's some good sleuthing there.  OP never did say what was wrong with his module.