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6. Operation
6.6.2.1 Supply Voltage Inputs
With these inputs the AS-probe adapter is connected to the power supply.
The adapter can be supplied with a DC voltage between 9 V and 36 V.
Since the adapter internally uses a DC/DC converter the current
consumption depends on the supply voltage. The higher the supply voltage,
the lower the current which is drawn by the adapter.
The input is equipped with a inverse polarity protection diode. Furthermore
besides an overvoltage suppressor the input has a protection circuit which
shortens the input in case of permanent overvoltage to protect the circuit. In
this case the also integrated resettable fuse will trigger after a few moments.
The threshold of the protection circuit is ~39 V. To reset the triggered
protection circuit the adapter has to be disconnected from the power supply.
6.6.2.2 Power LED
This LED lights up if the adapter is correctly supplied with power. If the LED
does not light up even though the adapter is connected to power supply
maybe the overvoltage protection circuit has triggered.
6.6.2.3 Probe Supply
At these outputs, the AS-active probes required for supply are ± 3 V highly
accurate. The outputs deliver a maximum current of 20 mA per AS-active
probe.
The supply for the probes and the inputs for the probe signals use the same
GND connection.
6.6.2.4 Probe Signal Input
At this input the measurement signal delivered from the probe is connected.
The maximal converted input voltage range is ±2 V with gain x5 and ±0.2 V
with x50.
The supply of the probe and the input of the probe signal use the same GND
connection.
6.6.2.5 Measurement Signal Output
At this output the amplified measurement signal is available. At maximum
amplitude the maximal output current is 2 mA. Correspondingly the load has
to be at least 5 kΩ. For smaller amplitudes the output can deliver even
higher currents.
Projekt Elektronik
MESS - UND REGELUNGSTECHNIK GMBH
Figure 63 Structure AS-Adapter 3
Page 78
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