Basic battery-powered portable DVM.
To operate without batteries, apply 5-6VDC tip+ to rear jack.
Upper board containing LSI chip, display and power supply.
Lower board containing range switching and analog circuitry.
|Serial Number: ||71-06046|
|Year of Manufacture: ||1978 (IC date code of 7814, copyright on case 1977).|
|Date of Receipt: ||29 Apr 2012|
|State upon Receipt: ||Fair physical condition. Battery leakage pooled at bottom of case. Some corrosion to battery contacts, input contact and LM307 IC leads. Some components had been replaced previously.|
|Date: ||30 Apr 2012|
|Procedure: ||Cleaned, powered up with 6V at battery contacts, ohms functional. Battery and input contacts cleaned.|
|Date: ||02 May 2012|
|Procedure: ||Partial schematic produced. Soldering of previous repairs cleaned up. DCV and ohms functional. AC not yet tested, nor connections around LM307.|
.. | B & K 2810 | ..
Early Digital Test Equipment