Measurement-computing miniLAB-1008 Bedienungsanleitung PDF herunterladen (Seite 20)

miniLAB 1008 User's Guide Functional Details

Table 3-3. Sample inputs and differential results

CHHI CHLO Result

-20 V 0 V Invalid

-15 V +5 V Invalid

-10 V 0 V -10 V

-10 V +10 V -20 V

0 V +10 V -10 V

0 V +20 V -20 V

+10 V -10 V +20 V

+10 V 0 V +10 V

+15 V -5 V +20 V

+20 V 0 +20 V

Additional information on analog signal connections

For general information regarding single-ended and differential inputs, refer to the Guide to Signal Connections

(available on our web site at www.mccdaq.com/signals/signals.pdf).

Digital I/O terminals (DIO0 - DIO3)

Connect up to four digital I/O lines to the screw terminals containing pins DIO0 to DIO3. Refer to the pinout

diagrams on page 3-5 for the location of these pins. You can configure each digital channel independently for

either input or output.

Overvoltage/short circuit protection is provided with a 1.5 kΩ series resistor on each I/O pin. Use of the resistor

may limit the value of the output current, however. For example, if the output current is 1 mA, the resistor drops

1.5 V, resulting in an output of 3.5 V.

You can use the digital I/O terminals to detect the state of any TTL level input. In Figure 3-8, if the switch is set

to the +5 V input, and the DIO0 reads TRUE (1). If the switch is moved to GND, the DIO0 reads FALSE.

+5V+GND

DIO0

Figure 3-8. Digital connection DIO0 detecting the state of a switch

Additional information on digital signal connections

For general information regarding digital signal connections and digital I/O techniques, refer to the Guide to

Signal Connections (available on our web site at www.mccdaq.com/signals/signals.pdf).

Power terminals

The PC +5V connections on the screw terminal draw power from the USB connector. The +5 V screw terminal

is a 5 volt output that is supplied by the computer.

Caution! The PC +5V terminals are outputs. Do not connect an external power supply to a +5 V screw

terminal, or you may damage the device and possibly the computer.

The maximum total output current that can be drawn from all miniLAB 1008 connections (power, analog and

digital outputs) is 500 mA. This maximum applies to most personal computers and self-powered USB hubs.

Bus-powered hubs and notebook computers may limit the available output current to 100 mA.

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Measurement-computing miniLAB-1008 Bedienungsanleitung Seite 20