Measurement-computing USB-7202 Bedienungsanleitung PDF herunterladen (Seite 20)

USB-7202 User's Guide Specifications

Table 4 summarizes the noise performance for the USB-7202. Noise distribution is determined by gathering

50 K samples with inputs tied to ground at the user connector. Samples are gathered at the maximum specified

sampling rate of 50 kS/s.

Table 4. Noise performance

Range Typical counts LSBrms

±10 V 10 1.52

±5 V 10 1.52

±2 V 11 1.67

±1 V 14 2.12

Digital input/output

Table 5. Digital I/O specifications

Parameter Specification

Digital type CMOS

Number of I/O 8 (DIO0 through DIO7)

Configuration Independently configured for input or output

Pull-up/pull-down

configuration

All pins configurable via jumper (JP1) to Vs or ground via 47 kΩ resistors.

Input high voltage 2.0 V min, 5.5 V absolute max

Input low voltage 0.8 V max, –0.5 V absolute min

Output high voltage

(IOH = –2.5 mA)

3.8 V min

Output low voltage

(IOL = 2.5 mA)

0.7 V max

Power on and reset state Input

External trigger

Table 6. External trigger specifications

Parameter Conditions Specification

Trigger source (Note 2) External digital TRIG_IN

Trigger mode Software-selectable Edge sensitive: user configurable for CMOS compatible rising or

falling edge.

Trigger latency 10 µs max

Trigger pulse width 1µs min

Input high voltage 4.0 V min, 5.5 V absolute max

Input low voltage 1.0 V max, –0.5 V absolute min

Input leakage current ±1.0µA

Note 2: TRIG_IN is a Schmitt trigger input protected with a 1.5K Ohm series resistor.

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Measurement-computing USB-7202 Bedienungsanleitung Seite 20