Measurement-computing USB-2627 Manual de usuario descargar pdf (Pagina 22)

USB-2627 User's Guide Specifications

Note 3: The DAC update rate is not affected by the number of channels in the scan.

Table 6. Calibrated absolute accuracy specifications

Range

Absolute accuracy (±LSB)

±10 V

16.0

Table 7. Calibrated absolute accuracy components specifications

Range

% of reading

Offset

(±mV)

Offset tempco

(µV/°C)

Gain tempco

(ppm of range/°C)

±10 V

±0.0183

1.831

12.7

Table 8. Relative accuracy specifications (±LSB)

Range

Relative accuracy (INL)

±10 V

4.0 typ

Analog input/output calibration

Table 9. Analog input/output calibration specifications

Parameter

Specification

Recommended warm-up time

15 minutes min

Calibration method

Self-calibration (firmware)

Calibration interval

1 year (factory calibration)

AI calibration reference

+5 V, ±2.5 mV max. Actual measured values stored in EEPROM.

Tempco: 5 ppm/°C max

Long term stability: 15 ppm/1,000 hours

AO calibration procedure

The analog output pins are internally routed to the analog input circuit.

For best calibration results, disconnect any XDACx connections at the I/O connectors

prior to performing AOUT calibration.

Digital input/output

Table 10. Digital input/output specifications

Parameter

Specification

Digital type

TTL

Number of I/O

Configuration

Three banks of 8. Each bit may be configured as input (power on default) or output.

Pull-up configuration

Each port has 47 kΩ resistors that are configurable as pull-up or pull-down (default)

using an onboard jumper (W5, W6, W7).

Digital I/O transfer rate

(system-paced, asynchronous)

33 to 4,000 port reads/writes or single bit reads/writes per second typ;

system dependent.

Input high voltage

2.0 V min

5.0 V absolute max

Input low voltage

0.8 V max

0 V recommended min

Output high voltage

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –24 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Output current

60 mA max, not to exceed 24 mA for one bit, resulting in 2.5 mA max when all 24 bits

are enabled.

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