Originally bought as spares or repair. Now fixed up and working - mostly just a matter of using known voltages and other meters to get the references, zero point and turn over settings correct. Repaired a fault on the sample/hold digital board as well.
Options:
30 GP-IB
40 Sample/Hold
50 50Hz mains supply (logic clocked at different frequency to maximise 50Hz rejection).
Readings now accurate by comparison with 6.5 digit meter, but not formally calibrated.
This beast is accurate and FAST - on DC will sample every 240mS. It is also built to a standard which makes modern kit look totally shabby by comparison, and is repairable!
I've not tested the GP-IB as I don't have a GP-IB card.
Based in near Warwick in UK.
If interested, please contact me offline at david dot partridge at dsl dot pipex dot com.
I have hard and soft copy of the operations and service manual which will come with it.