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5 - 92 FUNCTION REFERENCE
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 ∆ control
is used to select the waveform.
The result of the measurement is displayed in the top left corner of the screen.
The following
measurements are possible:
(Refer to section MEASURE
MENU for details of signal
parameters).
- 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.
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)
ST6670
1−
MAX
HIGH
RMS
DC
LOW
MIN
PKPK
PRESHOOT
OVERSHOOT
UNDERSHOOT
dc
1
kj–1+
-------------------
Sn()×=