Feature #1138
Support #816: Schematics recovery for analog board Keithley 2001
Support #818: Schematics for analog board (Keithley 2001-102-04L)
Восстановление источника тока и диапазонов измерения сопротивления
10%
Updated by Izerg about 7 years ago
- Subject changed from Восстановление схемы ИОН to Восстановление источника тока и диапазонов измерения сопротивления
Updated by Izerg about 7 years ago
- % Done changed from 0 to 10
Проверить цепь AMPIN, U 317, не совсем понятно - зачем она туда подключается.
Updated by tin about 7 years ago
Suggest to draw schematics without functional analysis first, and then do function check, net naming and signal definition on schematics verification stage.
Предлагаю для начала срисовать схему без лишних затрат времени, а в функциональных назначениях и принципе работы разбираться во время проверок/переноса в чистовик.
Connection of U317.7, U317.11 to U323.6 confirmed on board Keithley #2.
According to repair manual U323.8 (/ACAL) which is sourced from U307.5 is used for current calibration(?).
U307 also controls U317 mux:
| U307.6 | /200uA signal | 0 = U317 closed (1kohm shunt) |
| U307.7 | /2mA signal | 0 = U317 closed (100ohm shunt) |
| U307.14 | /20mA signal | 0 = Q311 on (10 ohm shunt) |
| U307.13 | /200mA signal | 0 = Q309 and Q307 on (1 ohm shunt) |
| U307.12 | /2A signal | 0 = Q310 and Q305 on (0.1 ohm shunt) |
As this is used for current measurement function, not only ohms.