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DEWE-ORION-0824-20x
ARMED
SOURCE
GATE
AUX (UP / DOWN)
Start / stop trigger
Selected source input
Selected gate input
Selected aux input
OUT
Main Counter
Main Counter Value
SOURCE
Selected source input
OUT
Sub Counter
Sub Counter Value
Figure 3: Counter functions
The sub counter is automatically switched on in the background if the measurement result needs principal
two counters. For example measuring the duty cycle of an input signal needs the information of the period
time and the pulse width for the calculation. Also for precise measurement the frequency of a signal synchro-
nized to analog samples two counters are needed.
SOURCE / SOURCE PAIR
GATE / GATE PAIR
AUX / AUX PAIR
Additional
Inputs
Filter
Main
Counter
Main counter out
Sub counter out
Sub counter out
Main counter out
Decoder
Decoder
Filter
Sub Counter
Sub Counter
Main
Counter
Figure 4: Basic counter organization
All the counter functions are triggered with the rising edge of the input signal. If falling edge trigger is required
the inputs can be simple inverted by software settings. To remove glitches at the input a digital filter between
100 nsec and 5 µsec within 7 steps in the filter block can be selected. The following block selects if the
encoder mode is used or not. The pair counter offers an especially selection: It can measure also the input
frequency of the neighbor counter.
Summary of Contents for DEWE-ORION-0824-20 Series
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