Philips PM3350A - Page 82

4 • 48 4 APPLICATIONS
RMS Root mean square voltage
The RMS measurement Is calculated between the MAIN CURSORS and related to
the absolute zero level. This zero level Is Indicated as a horizontal dotted line and
Is related to the grounded Y position. The correct way to use this function Is:
- activate the RMS function,
. ground the trace and adjust the zero level anywhere on the screen by means
of the Y POS rotary knob,
- press the GND key once again (the signal Is now connected to the channel).
Do not re-adjust the Y POS rotary knob anymore.
The measuring result Is shown in the top text area.
If the VAR rotary knob of the channel Is in CAL position, the result will be
displayed in Volts. If the VAR rotary knob Is in UNCAL position, the result will be
displayed in Divisions:
RMS = ... mV, or RMS = ... DIV
MEAN Mean voltage
The MEAN measurement is calculated between the MAIN CURSORS and related
to the absolute zero level. This zero level Is indicated as a horizontal dotted line
and is related to the grounded Y position. The correct way to use this function is
- activate the MEAN function,
- ground the trace and adjust the zero level anywhere on the screen by means
of the Y POS rotary knob,
- press the GND key once again (the signal is now connected to the channel).
Do not re-adjust the Y POS rotary knob anymore.
The measuring result Is shown in the top text area.
if the VAR rotary knob of the channel is in CAL position, the result will be
displayed in Volts. If the VAR rotary knob is in UNCAL position, the result will be
displayed in Divisions:
MEAN = ,,, mV, or MEAN = ... DIV
4.3 MENUS AND MEASUREMENTS