6. There appears to be a problem with a 7-segment display on a DMM sometimes skipping certain numbers. How would you test the display?
Options
A. Remove the display unit and check each segment diode with an ohmmeter. Replace the defective segments.
B. Apply 5 V directly to each segment of the display and check for individual segment operation. Replace any segment that has voltage applied but is not lit.
C. Tie all of the segments together and connect to Vcc; the number 8 should appear on the display. Now check the display supply voltage to determine if the display is receiving the correct voltage.
D. Connect the DMM to a variable supply and very slowly increase the voltage, while observing for missing digits. Then check the segment voltage to determine whether the display or the display driver is bad.
Correct Answer: Connect the DMM to a variable supply and very slowly increase the voltage, while observing for missing digits. Then check the segment voltage to determine whether the display or the display driver is bad.
7. Why is a pull-up resistor needed for an open collector gate?
8. When performing binary addition using the 2's-complement method, an ________ can occur if ________ are of the same ________; the error is indicated by a(n) ________.
Options
A. error, both numbers, magnitude, negative sign
B. overflow, both numbers, sign, incorrect sign bit
is equal to ________.
