
Measurement Tutorial 4
AC VOLTAGE AND CURRENT MEASUREMENT
measurements, for instance, cannot be made with dc coupling. Remember, however, that when the 8842A measures signals with the ac functions, the reading on the display does not include the dc component (if one exists). For example, consider Figure
Figure 4-8. Combined AC and DC Measurement
4-20. Combined AC and DC Measurements
The 8842A can be used to evaluate the true rms value of waveforms such as the one shown in Figure
V RMS = V AC | 2 +V DC | 2 |
4-21. Bandwidth
Bandwidth defines the range of frequencies to which an instrument can respond accurately. The accuracy of the 8842A is specified for sinusoidal waveforms up to 100 kHz, or for nonsinusoidal waveforms with frequency components up to 100 kHz. The
For signals with components greater than 100 kHz, the measurement accuracy is reduced because of frequency bandwidth and
4-22. Zero-Input VAC Error
If the 8842A input terminals are shorted while the VAC function is selected, the 8842A displays a