Applications; Rms Value Of Ac Signals With Dc Component; Rms Current; Rms Ac-To-Dc Converter - HP 3400A Operating And Service Manual

b. Set RANGE switch (5) to 300 VOLTS position.
When measuring an ac signal superimposed on a DC level, always
set the range switch to the 300 volt position. A high voltage tran-
sient due to the application of a DC voltage will damage the input
circuitry.
c. Connect test lead to point to be measured.
d. Rotate RANGE switch counterclockwise until meter (1) indicates on upper two thirds
of scale.
3-9. APPLICATIONS
3-11. RMS Value Of AC Signals With DC Component
mms =/ Sacer + Sae-
3-13. RMS Current
3-14. To measure rms current, use an -hp- Model 456A AC Current Probe. This probe clips
around the current conductor and provides an output voltage that is proportional to the cur-
rent being measured. Using this method, rms.currents of one milliampere to one ampere can
be measured.
3-15. RMS AC-To-DC Converter
3-2