Measurement-computing USB-2416-4AO Uživatelský manuál stáhnout pdf (Strana 37)

USB-2416-4AO User's Guide Specifications

Analog voltage output

Unused VDACx output channels should be left disconnected.

The USB-2416-4AO output voltage level defaults to 0 V whenever the host PC is reset, shut down or

suspended, or if a reset command is issued to the device.

The duration of the output transient depends highly on the enumeration process of the host PC. Typically, the

output of the USB-2416-4AO is stable after two seconds.

Table 20. Analog voltage output specifications

Parameter Conditions Specifications

Digital-to-analog

converter

DAC8555

Number of channels 4

Resolution 16 bits

Output ranges Calibrated ±10 V

Uncalibrated ±10.05 V, software configurable

Output transient Host PC is reset, powered on, suspended or a reset

command is issued to device (refer to the output

transient discussion above)

Duration: 2 s

Amplitude: 2 V p-p

Initial power on Duration: 50 ms

Amplitude: 5 V peak

Differential

non-linearity

±0.25 LSB typical

±1 LSB maximum

Output current VDACx pins ±3.5 mA maximum

Output short-circuit

protection

VDACx connected to AGND Unlimited duration

Output coupling DC

VDACx readback Each VDACx output can be

independently measured by the onboard

A/D converter.

Software selectable

Power on and reset

state

DACs cleared to zero-scale: 0 V,

±50 mV

Output noise 30 µVrms

Settling time To rated accuracy, 10 V step 45 µs

Slew rate 1.0 V/µs

Throughput Single-channel 1000 S/s maximum, system-dependent

Multi-channel 1000 S/s / #ch maximum, system-

dependent

Table 21. Calibrated absolute accuracy specifications

Range Accuracy (±LSB)

±10 V 16.0

Table 22. Calibrated absolute accuracy components specifications

Range % of reading Offset (±mV) Temp drift (%/°C) Absolute accuracy at FS (±mV)

±10 V ±0.0183 1.831 0.00055 3.661

Table 23. Relative accuracy specifications

Range Relative accuracy (±LSB)

±10 V 4.0 typical

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 49 50

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