Measurement-computing PCI-DAS6023 Manuale Utente Scaricare il pdf (Pagina 35)

PCI-DAS6023 and PCI-DAS6025 User's Guide Specifications

Analog output pacing and triggering

Table 13. Analog output pacing and triggering specifications

DAC pacing

(software programmable)

Internal counter – ASIC. Selectable time base:

 Internal 40 MHz, 50 ppm stability.

 External source via AUXIN<5:0>, SW selectable.

External convert strobe: D/A UPDATE

Software paced

DAC gate source

(software programmable)

External digital: D/A START TRIGGER

Software gated

DAC gating modes

External digital: Programmable, active high or active low, level or edge

DAC trigger sources

External digital: D/A START TRIGGER

Software triggered

DAC triggering modes

External digital: Software-configurable for rising or falling edge.

DAC pacer out

Available at user connector: D/A PACER OUT

RAM buffer size

16 K samples

Data transfer

DMA

Programmed I/O

Update DACs individually or simultaneously, software selectable.

DMA modes

Demand or non-demand using scatter gather.

Waveform generation throughput

10 kS/s max per channel, 2 channels simultaneous

Analog input/output calibration

Table 14. Analog I/O calibration specifications

Recommended warm-up time

15 minutes

Calibration

Auto-calibration, calibration factors for each range stored on board in non-volatile

RAM.

Onboard calibration reference

DC Level: 10.000 V ± 5 mV. Actual measured values stored in EEPROM.

Tempco: 5 ppm/°C max, 2 ppm/°C typical

Long-term stability: 15 ppm, T = 1000 hrs, non-cumulative

Calibration interval

1 year

Digital input/output

Discrete

Table 15. Discrete DIO specifications

Digital type

Discrete, 5V/TTL compatible

Number of I/O

Configuration

8 bits, independently programmable for input or output. All pins pulled up to +5 V

via 47 K resistors (default). Positions available for pull-down to ground (factory

configured option).

Input high voltage

2.0 V min, 7.0 V absolute max

Input low voltage

0.8 V max, –0.5 V absolute min

Output high voltage

(IOH = -32 mA)

3.80 V min, 4.20 V typ

Output low voltage (IOL = 32 mA)

0.55 V max, 0.22 V typ

Data transfer

Programmed I/O

Power-up / reset state

Input mode (high impedance)

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 43 44

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