German multimeter Nr.241118

 


 

UKA9 Nr.241118 Multimeter Black Bakelite 3300 mirror scale in felt lined leatherette covered wood box. AC/DC ten ranges 3/12/60/300/600V and .012/.06/.3/1.2/6A As can be seen I have had to replace some of the resistors as the wire wound originals had gone open circuit, the rectifier was also replaced with a copper oxide one from a scrap meter. The toggle switch was making intermittent contact but now works well after cleaning and reassembling. The meter works on all ranges and is reasonably accurate.  Made by Theodor Horn of Leipzig Germany 1943?

I have traced out the circuit diagram:


This is the trade mark which is on the scale plate. I am indebted to Henk van der Meij for identifying the manufacturer


   

I have recently (June 2014) received these pictures of an ohmmeter which has many similar constructional similarities but it would seem from a different manufacturer as the works was demolished in 1945. Production resumed after the war firstly for the Americans and then the Russians. for details see : http://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=14902.  A pencilled date indicates that it may have been made or calibrated in 1947.