Today’s quick visual teardown is of an 1984 vintage Keithley 197 microvolt DMM, Despite considerable age, it’s still quite alive and kicking and very useful for measuring low currents and voltages.
-
- Front
-
- Handy short manual on the back
-
- Display driver
-
- Painted transistors- some type of matching indication?
-
- A bit of a bodge?
-
- Guard traces around sensitive circuits
