Measurement-computing USB-1602HS-2AO Manual de usuario descargar pdf (Pagina 41)

USB-1602HS-2AO User's Guide Specifications

Trigger sources

Table 11. External trigger specifications

Parameter

Specification

Available trigger sources

 Analog input hardware

 Analog software trigger

 External digital input

 Digital pattern

 Counter/totalizer

Trigger source details

Analog input (hardware) trigger

(CH0 – CH1)

Input signal range: entire span of selected voltage range

Channel selectable

Trigger level: Programmable (12-bit resolution)

Hysteresis: Programmable (12-bit resolution)

Latency: 1.25 uS typical

Accuracy: ±2% of reading, ±10 mV offset maximum

Analog software trigger

(CH0 – CH1)

Trigger range: Anywhere within range of the trigger channel

Trigger level: Programmable (16-bit resolution)

Latency: one sample period (maximum)

External digital:

 (EXT TRIG — BNC

 DIG TRIG — SCSI

Input signal range: –15 V to +15 V maximum

Trigger level: TTL level sensitive

Minimum pulse width: 50 ns high, 50 ns low

Latency: 100ns maximum

Digital pattern triggering

DIN0-15

 16-bit pattern triggering on the digital port, DIN0-DIN15

 Programmable for trigger on equal, not equal, above, or below a value.

 Individual bits can be masked for "don’t care" condition.

 Latency: One sample period, maximum

Counter/totalizer triggering:

(CTR0-3)

Counter/totalizer inputs (CTR0-3) can trigger an acquisition. User can select to

trigger on a frequency or on total counts that are equal, not equal, above, or

below a value, or within/outside of a window rising/falling edge.

Latency: One sample period, maximum

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