183 & 185
Users Manual
14
Application: Using AC DC and AC+DC in Volts Mode
DC = 5 V
AC = 1V RMS
Frequency = 60 Hz
ahr09f.eps
AC voltages riding on power supplies can cause problems with electronic
circuits. If you set the meter to DC Volts mode, the display shows the DC
component of 5.000 V. However, the AC component may be missed. It is
recommended that you set the meter to AC DC dual display mode. The main
display shows the 5.000 V DC voltage and the upper display shows the 1.000
V AC voltage. AC DC mode also allows you to simultaneously make AC and
DC measurements without changing the meter settings.
Another useful measurement is AC+DC total RMS. To take this measurement,
press softkey
3
to toggle to AC+DC. In the above example, the total RMS
of 5.099 V shows on the main display and the frequency of 60.00 Hz shows on
the upper display. When calculating the power dissipated in a circuit
component, it is critical that the DC value is factored into the equation
VRMS
X
IRMS, where VRMS is AC+DC total RMS.
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