HP 3458A - Why is this 31 year old Multimeter UNRIVALLED?

Participate in PCBWays 4th Design Contest https://www.pcbway.com/activity/4th-p...
Subscribe to ExtraSolar    / @pitushi  
My desoldering station https://www.banggood.com/custlink/vDm...
PCB holders from Welectron https://www.welectron.com/PCB-Holder

HP Journal about 3458A https://www.hpl.hp.com/hpjournal/pdfs...
xDevs on 3458A https://xdevs.com/fix/hp3458a/
Fluke 732A over 1 Month http://reps.feste-ip.net:42545/dashbo...
Simulation: Dual slope integrating ADC https://tinyurl.com/yhcdn78z
Simulation: 3458A Multisloper https://tinyurl.com/ye9xuu69
Simulation: AD637 RMS Converter https://tinyurl.com/ye572teb
Simulation: Sample&Hold Frequency https://tinyurl.com/ydrxrovo

00:00 PCBway
01:27 Intro
03:34 First power on
05:08 History
06:55 Teardown
08:15 A1 Bboard
10:05 ADC theory
14:45 ADC in practice
16:20 ADC repair?
21:39 ADC error speculation
23:03 ADC success
24:34 AC error
25:35 AC basics
28:44 AC repair
32:37 Cable cap
33:19 Outgard PSU
33:47 Cooling fans
35:13 Mains filter
36:13 Plastic parts
36:44 Voltage reference
38:04 Digital board
39:29 Calibration
43:28 Results