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E-1608 User's Guide Functional Details

Leave unused input channels either floating or tied to an AGND terminal. Source impedances should be kept as

small as possible to avoid settling time and accuracy errors.

Figure 4 shows DIFF channels 0-3 connected to a ground path resistor.

Figure 4. DIFF connections with ground path resistor

Channel-Gain queue

The channel-gain queue feature allows you to configure a list of channels, modes, and gains for each scan. The

settings are stored in a channel-gain queue list that is written to local memory on the device.

The channel-gain queue list contains one or more channel numbers, modes, and range settings. You can

configure up to 8 elements. The channels can be listed in any order, and can include duplicate channels for

sampling at different ranges.

An example of a 4-element list is shown in the table below.

Sample channel gain queue list (SE mode)

Element

Channel

Range

CH5

BIP5V

CH1

BIP10V

CH3

BIP1V

CH5

BIP5V

Carefully match the gain to the expected voltage range on the associated channel or an over range condition

may occur. Although this condition does not damage the device, it does produce a useless full-scale reading,

and can introduce a long recovery time due to saturation of the input channel.

For more information about analog signal connections

For more information about analog input connections, refer to the Guide to DAQ Signal Connections (this

document is available on our website at www.mccdaq.com/signals/signals.pdf).

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Measurement-computing E-1608 Manuale Utente Pagina 14