Magnetic Instrumentation 942B, Instruction Manual

4 

Voltage Control 
 

This 10 turn potentiometer is used to control the voltage to which the energy storage 
capacitor bank is charged.  Voltage may be increased by turning the knob clockwise.  
Voltage may be decreased by turning off the power-on switch (circuit breaker) or by 
initiating the Magnetize function, thereby discharging the capacitor bank through the 
fixture.  NOTE: When initially setting the voltage it is best to start with the voltage 
control knob at minimum and slowly adjust this control clockwise so as not to overshoot 
the desired level. 
 

Function Select Switch 

 
Manual (Center Position) 
In this mode of operation, manual initiation of both the Charge and Magnetize function is 
required.  Press the Charge push-button when the white ready-to-charge light is on.  The 
magnetizer will charge to the voltage level set by the Voltage Control knob and the green 
ready-to-magnetize light will turn on. Voltage may be increased by turning the Voltage 
Control knob clockwise, or the magnetizer may be discharged by pressing the Magnetize 
push-button, provided the green ready-to-magnetize light is illuminated. 
 
Auto Magnetize (Down Position) 
In this mode of operation the charge function must be initiated by pressing the Charge 
push-button.  Upon reaching the voltage level set by the Voltage Control knob the 
magnetizer will automatically discharge. 
 
Auto Charge (Up Position) 
In this mode of operation the magnetizer will automatically charge to the voltage level set 
by the Voltage Control knob and maintain this level until the Magnetize push-button is 
pressed.  After a period of “off time” the magnetizer will recharge automatically and be 
ready for the next cycle. 
 

Charge Light

 
Illumination of the white light indicates that the magnetizer is ready-to-charge. 
 

Charge Push-Button

 
The Charge push-button is active only when the magnetizer is ready-to-charge as 
indicated by the white light. Pressing the Charge push-button will cause the machine to 
charge to the level set by the Voltage Control knob. 

 
External Charge 

Directly beneath the Charge push-button is the external charge socket. A dry contact 
closure between the 2 terminals will provide a Charge input. (The same as pressing the 
Charge push-button.)