218 



A. M. Alekseev et al. 



is self-compensating. The instrument readings do not, therefore, depend 

 on the state of the feeding sources, and there is practically no drifting of 

 the zero point. 



At the instant when the armature of the vibro-converter is moved to the 

 right contact, the input of the amplifier is shorted and simultaneously the 

 -circuit of the secondary winding of the Tr-2 transformer is disconnected. 

 In other words, the instrument produces a half-period rectification. 



Fig. 15. The body of the GAZ-69 vehicle with the PN-145 generator. 1— PN-145 gener- 

 ator: 2 — block of contactors; 3 — gearbox; 4 — propeller shaft; 5 — sUdes. 



The main features of the instrument are as follows: 



1. The high sensitivity of the instrument, corresponding to 1.0 mV over 

 the whole width of the film, can be further increased. 



2. The record is made on a standard low sensitivity cinefilm. 



3. When processing the results of the record, a photomultiplier is used 

 which magnifies the record of up to 10 times linear. 



4. The film is moved by a spring motor with a speed of 0.25 mm/sec. 



5. The instrument has its own power supply from five 2S-KU and two 

 GB-225 dry batteries which ensure normal operation of the instrument 

 for 40-50 hours. 



