Measurement-computing USB-2627 Manual do Utilizador descarregar pdf (Página 21)

USB-2627 User's Guide Specifications

Noise performance

For the peak-to-peak noise distribution test, a single-ended input channel is connected to AGND at the input

terminal block, and 32,000 samples are acquired at the maximum rate.

Table 3. Noise performance specifications

Range

Counts

LSBrms

±10 V

1.21

Settling time for Multichannel Measurements

Settling time is defined as the accuracy that can be expected after one conversion when switching from a

channel with a DC input at one extreme of full scale to another channel with a DC input at the other extreme of

full scale.

Table 4. Input settling time specifications in µS, typical

Range

1 µS settling accuracy

(% FSR)

5 µS settling accuracy

(% FSR)

10 µS settling accuracy

(% FSR)

±10 V

0.0152

0.0061

0.0015

Analog output

Table 5. Analog output specifications

Parameter

Condition

Specification

Number of channels

Resolution

16 bits

Output ranges

Calibrated

±10 V

Output transient

Host computer is reset, powered on, suspended,

or a reset command is issued to the device

Duration: 100 ms

Amplitude: 2V p-p

Powered off

Duration: 100 ms

Amplitude: 5 V peak

Differential

non-linearity

±0.25 LSB typ

±1 LSB max

Output current

XDACx pins

±3.5 mA max

Output short-circuit

protection

XDACx connected to AGND

Unlimited duration

Output coupling

Power on and

reset state

DACs cleared to zero-scale: 0 V, ±150 mV

Pacer source

Two programmable sources:

 Internal output scan clock

 External output scan clock (XDPCR),

independent of external input scan clock

(XAPCR)

Trigger sources

TTLTRIG (see External trigger on page 23)

Output update rate

1 MS/s max (Note 3)

Settling time

To rated accuracy, 10 V step

2 µs

Slew rate

20 V/µs

Throughput

Software paced

33 S/s to 4,000 S/s typ, system-dependent

Hardware paced

1 MS/s max, system-dependent

Note 1: Leave unused XDACx output channels disconnected.

Note 2: XDACx defaults to 0 V whenever the host computer is reset, powered on, suspended, or a reset

command is issued to the device.

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