Digital Test
Weston 4440

Manufacturer: Weston
Model: 4440
Year: 1972
Schematic: MF
Functions: DCV, ACV, 200uA-DC/AC, Ohms
Display: LED
Digits: 3.5
Logic: LSI digital, discrete & SSI analog

Early battery-powered portable DVM.

To operate without batteries, connect 5.5-6V power supply to pins at rear, + on smaller right pin, - on larger left pin, as viewed from rear.

Rear view with the battery compartment removed and cover for 2 of the 4 cell C positions removed. Note power or recharger connector pins at lower center of battery compartment.


View of the circuit boards. The board on the left sits upside down and above the board on the right when installed.

- Unit Log -

Serial Number: 91589
Year of Manufacture: 1972 (IC date code of 7220).
Date of Receipt: 29 Apr 2012
State upon Receipt: Good physical condition. Some corrosion on battery contacts.

Date: 29 Apr 2012
Procedure: Powered up with external power supply. Functional, might do with some calibration. Cleaned.

Date: 01 May 2012
Procedure: Calibration checked. Quite good in comparison to HP bench DVM. Tweaked slightly.

  .. | Weston 4440 | ..
Early Digital Test Equipment