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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.
Internals.
View of the circuit boards. The board on the left sits upside down and above the board on the right when installed.
| 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. |
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.. | Weston 4440 | ..
Early Digital Test Equipment |
bhilpert |