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Measuring modes on V ¢ (fig.20)
— Internal starting of measurements (INT START).
Measurements are continuously repetitively started by the PM2528.
The displayed value is the peak-peak {V ¢ ) value of a signal over a fixed period {400ms approx.}. tn this
mode, periodic signals with a frequency between 10Hz and 100kHz can be measured (see below).
—
External or manual starting of a measurement
The displayed value is the peak-peak value of a signal over one fixed period (400ms approx.}. The
measuring period is started via START MAN or START EXT in the MAN or EXT start mode. Periodic
signals with a frequency between. 10Hz and 100kHz can be measured.
10
8
6
4
INT START
DISPLAY :
MAN/EXT
START
START
"
START
DISPLAY :
COMMAND
&
COMMAND
6
Fig. 20. V % measurement.
Time relation of input signals
To determine the peak or peak-peak value of an input signal, a capacitor in the PM2528 has to be loaded,
which requires a certain time.
Asignal can be measured with full accuracy when its slew-rate is lower than 7 digits per Ys in normal mode or
70 digits per ps in high resolution mode. When the slew-rate of the input signal is higher, this signal must be
present for more periods (fig. 21}.
VOLTAGE ON CAPACITOR IN PM2528
MAX, SLEW RATE
"Ow
re
re
MEASURING TIME
at
START
STOP
Fig. 21. Stew-rate of input signal at Vpeak measurements.
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