Measurement-computing USB-2527 Bedienungsanleitung PDF herunterladen (Seite 56)

USB-2527 User's Guide Specifications

Input sequencer

Analog, digital, and counter inputs can be scanned based on either an internal programmable timer or an

external clock source.

Table 7. Input sequencer specifications

Scan clock sources: two (see Note 4)

Internal:

 Analog channels from 1 µs to 1 sec in 20.83 ns steps.

 Digital channels and counters from 250 ns to 1 sec in 20.83 ns steps.

External. TTL level input (XAPCR):

 Analog channels down to 1 µs minimum

 Digital channels and counters down to 250 ns minimum

Programmable parameters per scan:

Programmable channels (random order), programmable gain

Depth

512 locations

Onboard channel to channel scan rate

Analog: 1 MHz maximum

Digital: 4 MHz if no analog channels are enabled, 1 MHz with analog

channels enabled

External input scan clock (XAPCR)

maximum rate

Analog: 1.0 MHz

Digital: 4 MHz if no analog channels are enabled, 1 MHz with analog

channels enabled

Clock signal range:

Logical zero: 0 V to 0.8 V

Logical one: 2.4 V to 5.0 V

Minimum pulse width

50 ns high, 50 ns low

Note 4: The maximum scan clock rate is the inverse of the minimum scan period. The minimum scan

period is equal to 1 µs times the number of analog channels. If a scan contains only digital

channels, then the minimum scan period is 250 ns.

Some platforms can sustain scan rates up to 83.33 ns for digital-only scans.

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Measurement-computing USB-2527 Bedienungsanleitung Seite 56