Series 3700 System Switch/Multimeter User's Manual
Section 5: Basic Digital Multimeter (DMM) Operation
3700S-900-01 Rev. C / July 2008
5-13
Press a third time to select the end channel.
Press a fourth time to allow DMM configuration assignment to the
channel or range of channels.
NOTE
The ICL command
reset()
erases any channel assignments but
maintains the user-defined configurations such as
"my_dcv_conf1". Refer to the reset() command in the ICL
reference manual for additional details. Also, the default setting is
nofunction
for all channel assignments.
a. Press the
CLOSE
key.
6. Press the
TRIG
key and observe the display. If the "Overflow" message is
displayed, select a higher range until a normal reading is displayed (or press
the
AUTO
key
for autoranging). For manual ranging, use the lowest possible
range for the best resolution.
7. To measure other switching channels, repeat steps 5 and 6.
8. When finished, press the
OPENALL
key to open all channels.
AC voltage measurements and crest factor
The root-mean-square (RMS) value of any periodic voltage or current is equal to
the value of the DC voltage or current which delivers the same power to a
resistance as the periodic waveform does. Crest factor is the ratio of the peak
value to the RMS value of a particular waveform. This is represented by the
following equations:
The crest factor of various waveforms is different, because the peak-to-RMS
ratios are variable. For example, the crest factor for a pulse waveform is related
to the duty cycle; as the duty cycle decreases, the crest factor increases. The
RMS calculations and crest factor (CF) for various waveforms are shown in the
following figures.