Measurement-computing CIO-DAS801 Manuel d'utilisateur télécharger pdf (Page 11)

CIO-DAS801 User's Guide Installing the CIO-DAS801

The CIO-EXP16 and CIO-EXP32 were designed to interface to a single-ended input. Failure to set the switches

to single-ended when an EXP is connected results in floating, unstable readings from the EXP.

There are two ways to configure the analog inputs:

 Set the bank of eight DIP switches on the jumper block labeled S2 located near the I/O connector.

Position the switches in the OFF position (down) to configure the input for differential mode (default).

Position the switches in the ON position (up) to configure the input for single-ended mode.

Figure 2. Input configuration jumpers

Figure 3 shows one analog input and the single-ended / differential switch.

To A/D

Circuit

CH0 HI

CH0 LO

Low Level Ground

(LLGND)Switch for

Differential = Open

Single Ended = Closed

Figure 3. Input configuration switch

 You can also install an SIP resistor pack at position RN2 to convert the inputs to single-ended.

This package of 10K resistors provides a reference to ground for each of the eight Low Input lines. This

type of input behaves like a single-ended input since there is a reference to ground and floating sources

may be measured.

Figure 4 shows one analog input line with the SIP resistor installed. When the SIP resistor package is

installed, all eight analog inputs are single-ended.

To A/D

Circuit

CH0 HI

CH0 LO

Low Level Ground

(LLGND)

Resistor SIP

Differential = RN2 Open

Single Ended = RN2 Installed

Figure 4. Analog input configuration

Note: If you are using an EXP board with the CIO-DAS801, do not install the SIP resistor. Set the input

configuration switch to single-ended for both the EXP channel and the CJC channel.

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Measurement-computing CIO-DAS801 Manuel d'utilisateur Page 11