Download Mark the ( ) and ( ) answer:

Mark the ( ) and ( ) answer:
Q1) Refer to VOM AC voltage measurement:
1. AC voltage is applied to input jacks A1J2 and A1J3.
2. On low range scales (.015 Vac and 1.5 Vac), the input voltage is
applied directly to buffer A3U1.
3. Operational amplifier (buffer circuit) A3U1 prevents the divider
network A3R13 ~ A3R22 from loading the input signal.
4. A3R49 and A3R50 are series dropping resistors which supply the
meter with the proper voltage for full scale deflection.
5. A1RT1 is a thermistor which compensates for changes in ambient
temperature to maintain a relatively constant meter response.
6. Protection diodes A1CR1 and A1CR2 limit the voltage across the
meter.
Q2) Refer to DC voltage measurement:
(higher/ divider network / input / AC / dropping / F.S.D.)
1. A3U1 prevents the divider network from loading the ………. signal.
2. A3S2A determines whether the input voltage is applied directly
or to ………………...
3. Resistors A3R21 and A3R22 used at ……… operation.
4. A3R34 and A3R35 are dropper resistors, produce …………….
5. A3R25 is a dropping ……………….resistor.
6. At ………… ranges the input voltage is divided by a divider network
before applying to A3U1.
Q3) Refer to AC current measurement:
(A1S1 / A3U2A / A3R58 / Vac / Aac)
1. ………….. selects the resistor in the divider.
2. ………….. amplifies the divider voltage by a factor of 1.6.
3. …………. is adjusted for a zero output on meter A1M1 with
output of A3U3 shorted.
4. …………. is adjusted when switch A3S1 is set to the ………….
function and should not be adjusted in the ………… mode.
Q3) Refer to OHMS measurement:
-Ve +Ve
1) A3VR3 is ………. Voltage regulation Circuit
2. A2VR1 ………. Voltage regulation Circuit
3. A2VR1 output is applied to the divider network (A3R69 ~
A3R75)
4. A3R69 ~ A3R75, A2R1, and the unknown resistance
create a voltage divider with a voltage drop proportional to the
unknown resistance.
5. A1R1 cancels any offset voltage that cause an untrue
reading.
6. A3U2A establishes a voltage across resistors A3R37 and
A1RT1 to produce full scale deflection.
7. At LPΩ, A3R79 is replaced by A3R80 and A3R81 LPΩ
ADJ.
8. At LPΩ, A3R37 replaced by A3R36, determines the voltage
applied to A1M1.
1) Ohms scales are relatively linear.