Measurement-computing USB-1602HS-2AO Uživatelský manuál stáhnout pdf (Strana 31)

USB-1602HS-2AO User's Guide Functional Details

The setpoint conditions (criteria) and update modes are summarized below.

Setpoint criteria

Inside window

The signal is below the 16-bit high limit (limit A) and above the 16-bit low limit (limit B).

Outside window

The signal is above the 16-bit high limit (limit A), or below the 16-bit low limit (limit B).

Greater than value

The signal is above the 16-bit low limit. The 16-bit high limit (limit A) is not used.

Less than value

The signal is below the 16-bit high limit. The 16-bit low limit (limit B) is not used.

Equal to value

The signal is equal to the 16-bit high limit. The 16-bit low limit (limit B) is not used.

This mode is intended for use when the counter or digital input channels are the source channel.

Only use this mode with counter or digital input channels as the channel source. To have similar

functionality for analog channels, use the inside window mode.

Hysteresis mode

Outside the window high forces output 2 until an outside the window low condition exists, then

output 1 is forced. Output 1 continues until an outside the window high condition exists. This

cycle repeats as long as the acquisition is running in hysteresis mode.

Setpoint output channel

 None

 Update the upper 8-bits of the digital output port

 Update the analog output channels (DAC0, DAC1)

Update modes

 Update on True only

 Update on True and False

 None – Do not update

Setpoint values for output

 16-bit DAC value or the most significant byte (MSB) of the digital output port when the input does meets

criteria.

 16-bit DAC value or the most significant byte (MSB) of the digital output port when the input does not

meet criteria.

Note: When using setpoints with triggers other than immediate, hardware analog, or TLL, the setpoint criteria

evaluation begins immediately upon triggering the acquisition.

Examples of control outputs

Detection on analog input, DAC, and digital port MSB updates

Example 1:

Update mode: Update on True and False

Criteria: Channel 1 — below limit

In this example, channel 1 is programmed with reference to one setpoint (limit A), defining a low limit.

Channel

Condition

State of

detect signal

Action

Below limit A

(for channel 1)

True

When the channel 1 analog input voltage is below limit A, update

DAC1 with the output value 0.0 V.

False

When the above condition is false, update DAC1 with the output value

of minus 1.0 V.

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