Measurement-computing USB-3101FS Instrukcja Użytkownika Pobierz pdf (Strona 12)

USB-3101FS User's Guide Functional Details

Analog outputs (AO 0 to AO 3)

The voltage output range for each channel is set at ±10 V. The channel outputs may be updated individually or

simultaneously.

USB connector

The USB connector provides +5 V power and communication. The voltage supplied through the USB connector

is system-dependent, and may be less than 5 V. No external power supply is required.

LED

The LED indicates the device status. It uses up to 5 mA of current and cannot be disabled. Refer to the

following table for the possible LED states.

LED States

LED State

Device status

Not lit

The device is not connected to a USB port or hub.

Continuous single-blink

The device is operating normally.

Continuous double-blink

The device is connected to a USB 1.1 Full-Speed port or hub, which may affect

performance.

Optimum performance requires connections to a USB 2.0 Hi-Speed host controller

(480 Mbps) and USB 2.0 high-speed hubs.

Strain relief slot for USB cable

Use the strain relief slot to keep the USB cable from disconnecting from the device inadvertently. Feed a tie

wrap through the slot and secure to the USB cable when it is connected to the device.

High-voltage applications

For high voltage applications, we recommend using the ACC-107 backshell with ten-position connector block

to ensure that the terminals are not accessible. The backshell also provides strain relief to protect the screw

terminals.

Figure 4. ACC-107 backshell with ten-position connector block

Additional details on this product are available on our web site at

www.mccdaq.com/cbicatalog/cbiproduct.asp?dept_id=586&pf_id=1871.

Connecting a load

Connect the positive lead of the load to the AO terminal, and the ground of the load to the COM terminal.

Figure 5. Connecting a load to the device

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