Measurement-computing USB-1608HS-2AO Instrukcja Użytkownika Pobierz pdf (Strona 18)

USB-1608HS-2AO User's Guide Functional Details

Wire- and cable-type interconnects have some amount of associated series resistance. To calculate the total

series resistance, multiply the overall length by the manufacturer's specified resistance per unit length (Ω). If the

series resistance becomes large enough, a voltage drop error occurs along the wire when supplying current to

the load resistance. The remote sensing feature compensates for the voltage drop error that occurs along the

wire.

Connecting the USB-1608HS-2AO when using the remote sensing feature

To connect the USB-1608HS-2AO for remote sensing, connect two separate output wires—one from the

VDACn_F (force) output terminal, and one from the VDACn_S (sense) input terminal—to the high side or

positive input terminal of the field device (load). The "n" in the terminal name refers to the number of the

analog output terminal (0 or 1).

For best results, these two wires should have identical length and gauge. The use of a twisted pair is highly

recommended.

In this configuration, the sense wire detects the voltage at the end of the force wire, and compensates for the I*R

loss along the wire due to the wire resistance.

load

should not exceed the specified 1000 Ω, and the R

series

should not exceed its specified limit of 75 Ω.

compliance

= ((R

load

+ R

series

) * AOUT)/R

load

Connecting the USB-1608HS-2AO when not using the remote sensing feature

If you are not using the remote sensing feature, connect a single output wire or cable from the VDACn_F

(force) output terminal(s) to the load, and leave the VDACn_S (sense) terminals unconnected.

The voltage output range for each channel is ±10 V. The current output is a maximum of ±10 mA per channel.

Analog ground terminals

The 10 analog ground (AGND) connections provide a common ground for all analog input channels, output

channels, and the analog trigger (TRIG_IN).

Refer to the pinout diagram on page 14 for the location of the AGND terminal pins.

Digital input terminals (DI0 to DI7) and digital output terminals (DO0 to DO7)

You can connect up to eight digital input lines to screw terminals DI0 through DI7.

You can connect up to eight digital output lines to screw terminals DO0 to DO7.

Refer to the pinout diagram on page 14 for the location of these pins.

(75 max)

Series

VDAC_F

(

Force)

VDAC_S

(

Sense)

(1000 max)

Load

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 32 33

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