22 



5. Chart Speeds 



Chart speed is changed from 1 inch per minute to 1/2 inch per minute 

 by means of a locking lever arm located at the lower left front end of the 

 recorder frame. The "down" position corresponds to a 1 inch per minute speed 

 and the "up" position corresponds to a 1/2 inch per minute speed. 



6. Sensitivity Adjustment 



The maximum travel of the recorder transformer cores is ±0.010 inch. 

 This corresponds to full-scale deflection of the pen. For full-scale deflec- 

 tion, it is necessary therefore to make the output of the recorder transformer 

 equal to that of the transducer transformer at the desired full-scale trans- 

 ducer output. This can be accomplished by limiting the output of either the 

 transducer transformer or the balance transformer by placing a shunt resist- 

 ance across the secondaries or by tapping off a portion of the voltage with a 

 resistance divider network. 



7. List of Controls 



The various controls are listed below for convenience. 



Name 



Instrument power 



Chart drive 



Timing selector 



2-hr timer 



Start 2-hr cycle 



Range selectors 



1 -hr timer 



Channel 1 range adjustment 



Channel 2, 3, ^ , 5 range 

 adjustment 



Zero adjustment 



Amplifier power 



Amplifier gain 



Calibration 



Labeled 



"Inst. Power On-Off" 



"Chart Drive On-Off" 



"Chart Drive Contin-Timed" 



"Manual Set Timer" 



"Automatic 2 Hr. Cycle-Push" 



"Sensitivity X3-X1" 



"One Hr. Timer" 



"Chan 1 Adj. Range" 



"Chan 2, 3, 4 , 5 Ad j . 

 Range" 



None 



"Power On-Off" 



"Gain" 



"Cal-Off" 



Located 



Control panel, front 



Control panel, front 



Control panel, front 



Control panel, front 



Control panel, front 



Control panel, front 



Control panel, rear 



Rear of case 



Panel (top rear of re- 

 corder frame) 



Control panel, rear 



Amplifier panel 



Amplifier panel 



Amplifier panel 



B. SCHAEVITZ BALANCE AMPLIFIER TYPE 60 AD 



1 . Description 



The balance amplifier is a specialized amplifier designed for use 

 with linear variable differential transformers and two-winding, two-phase 



