Which of the statements below best describes the basic operation of a dual-slope A/D converter?
A) The input voltage is used to set the frequency of a voltage-controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading.
B) A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter.
C) Two ramps are generated: one by the input voltage and the other by a reference voltage. The input voltage ramp charges the integrating capacitor, while the reference voltage discharges the capacitor and enables the counter until the capacitor is discharged, at which time the counter value is loaded into the output latches.
D) A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate.
C
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A) 300 lb/ft3. B) 450 lb/ft. C) 300 lb. D) 300 lb/ft. E) 350 lb/ft.
What important information must the service consultant write on the technician’s hard copy?
A. Vehicle and customer information B. When the customer’s vehicle problem occurs C. What the customer’s vehicle problem is D. All of above
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Answer the following statement true (T) or false (F)
One of the most important factors leading to an increased divorce rate in the late 19th century was the
A. women's growing economic independence as a result of the widespread entry into the professional world. B. stresses of urban life. C. emerging feminist movement. D. passage of more liberal divorce laws. E. decline of religious organizations.