Fluke CombiScope PM3370B User Manual page 212

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VOLT MEASUREMENTS
Description:
Voltage measurements can be made using the cursors or using automated,
calculated measurement routines. Cursors operate in the analog mode as well as
in the digital mode.
Calculated volt measurements are available in the digital mode only.
Using the cursors, three voltage readouts can be selected:
- V gives the voltage difference between the cursors.
- V1&V2 gives the absolute voltage with respect to ground for each cursor.
- V-ratio gives a percentage that can be reset by using the V=100% softkey.
For more details refer to the section CURSOR READOUT.
In the digital mode, the MEASURE menu provides automatic voltage
measurements.
This menu is reached via the key sequence 'MEASURE >> MEAS 1(2) >> volt'.
The TRACK control is used to select the type of measurement, and the
is used to select the waveform.
The result of the measurement is displayed in the top left corner of the screen.
1
- dc (DC VOLTAGE)
Measures the absolute dc level, related to the ground level of the signal. This
is the average voltage of all samples in one period. If no full period is present,
all input samples in the signal are included in the calculation.
1
------------------ -
dc =
k j –
+ 1
where: j = 1st mesial crossing [first sample if no full period]
k = 3rd mesial crossing [last sample if no full period]
S(n) = nth sample (j<=n<=k)
S n
FUNCTION REFERENCE
PRESHOOT
OVERSHOOT
MAX
HIGH
The following
measurements are possible:
RMS
PKPK
(Refer to section MEASURE
DC
MENU for details of signal
parameters).
LOW
MIN
UNDERSHOOT
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