b. When measuring the resistance value with the Avo 8, possible reasons for varience include a parallax error (not looking at the reading from directly above the meter), a reading error due to less divisions when measuring resistance, or the device not being properly zeroed. When measuring current, there are also fewer division, parallax is still a potential issue, and finally, incorrect zeroing of the meter. Voltage has an additional error, the loading of the meter itself. Alongside this issue, there is also parallax, zero, and accuracy/divisions.
With the DMM220, there are fewer errors. It displays up to 4 digits, is accurate within .3% and is auto ranging. There will be minimal effect by loading when measuring voltage.
c.The value measured for …show more content…
With a sesnsitivity of 20kΩ/V and using the 10V range, it has a resistance of 200kΩ. This changes the resistance being measured, causing a change in voltage. Doing a meter loading calculation (calculated-measured)/calculated gives a loading of 8.7%. Doing the same calculation for the digital meter (which has a much higer sensitivity) gives 0.4% loading, significantly less.
dTo measure voltage, it is clear that the DMM2200 was more suitable than the Avo8 due to the meter loading. A higher meter loading percentage will increase the variance from the true answer, meaning the lower value of the digital meter is desirable.
When measuring current, a lower resistance is ideal. It would seem, then, that the analogue meter would perform better, but the digital meter won out once again due to the difficulty of reading the scale on the analogue. Ease of operation is worth considering when selecting a multimeter.
Finally, when measuring resistance it is a clear choice once again. The digital meter gave a much closer measurement to the expected value due to a better scale, no risk of parallax, and being significantly easier to
With the DMM220, there are fewer errors. It displays up to 4 digits, is accurate within .3% and is auto ranging. There will be minimal effect by loading when measuring voltage.
c.The value measured for …show more content…
With a sesnsitivity of 20kΩ/V and using the 10V range, it has a resistance of 200kΩ. This changes the resistance being measured, causing a change in voltage. Doing a meter loading calculation (calculated-measured)/calculated gives a loading of 8.7%. Doing the same calculation for the digital meter (which has a much higer sensitivity) gives 0.4% loading, significantly less.
dTo measure voltage, it is clear that the DMM2200 was more suitable than the Avo8 due to the meter loading. A higher meter loading percentage will increase the variance from the true answer, meaning the lower value of the digital meter is desirable.
When measuring current, a lower resistance is ideal. It would seem, then, that the analogue meter would perform better, but the digital meter won out once again due to the difficulty of reading the scale on the analogue. Ease of operation is worth considering when selecting a multimeter.
Finally, when measuring resistance it is a clear choice once again. The digital meter gave a much closer measurement to the expected value due to a better scale, no risk of parallax, and being significantly easier to