Measurement-computing PCI-DAS4020/12 Bedienungsanleitung PDF herunterladen (Seite 24)

PCI-DAS4020/12 User's Guide Specifications

Dynamics and noise

Table 6. Dynamics and noise specifications

SNR (Signal-to-noise ratio)

66.6 dB

SINAD (signal-to-noise and distortion ratio)

66.5 dB

SFDR (spurious free dynamic range)

80 dB

THD (total harmonic distortion)

80 dB

Noise distribution:

(Rate = 10 KHz-20 MHz, Average % ± 2 bins,

Average % ± 1 bin, Average # bins)

Bipolar (5V): 100% / 98% / 5 bins

Bipolar (1V): 100% / 98% / 5 bins

Trig/Ext Clk BNC

Software selectable for A/D Start Trigger (TRIG1), A/D Stop Trigger (TRIG2) or A/D Pacer Gate (AGATE);

also used as an A/D clock input 2X clock source (DAQ_CLK).

Table 7. Trig/Ext Clk BNC specifications

Input impedance

50 ohm, 1 Mohm selectable (coaxial cable termination)

Input threshold

Programmable 2.5 V threshold or 0 V threshold

Input slew rate

1 V/µsec min

Input range

±5 V

Bandwidth

40 MHz

Coupling

Analog output

Table 8. Analog output specifications

D/A converter type

AD7237

Resolution

12-bits

Number of channels

Output range

±10 V, ±5 V software selectable

D/A pacing

Software paced

Throughput

System dependent. Using the Universal Library programmed output function (cbAout) in a

loop in Visual Basic, a typical update rate of 500 Hz (± 50 Hz) can be expected. The rate

was measured on a 330 MHz Pentium II based PC.

Data transfer

Programmed I/O

Monotonicity

Guaranteed monotonic over temperature

Analog output drift

±0.11 LSB/°C max, all ranges

Settling time

(20 V step to ± ½ LSB)

5 µs max

Slew rate

5 V/µs

Current drive

±5 mA

Output short-circuit

duration

25 mA indefinite

Output coupling

Output impedance

0.5 Ohm max

Miscellaneous

 Single buffered output latch

 Update DACs individually

On power-up and reset, the inputs to both D/A output buffers are grounded and the board’s

D/A outputs will be set to 0 volts ± 6 mV. Upon writing to the D/A converters, the output

buffers will reflect the D/A outputs and achieve rated accuracy. However, upon writing a 0

to the D/A’s, a small output change may be noted (up to 10 LSB).

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