B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuale Utente Scaricare il pdf (Pagina 10)

6 Chapter 1 Documentation Number UD128A8D4602 Manual

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph 353-91-792444 – Fax 353-91-792445

(Specifications - Analog Inputs Continued)

Input Range: 0 to 5 volts (default internal ref. w/o external scaling)

Linear Range using built-in 5 volt reference: +0.1 to +5.0 V

A/D Reference: Internal or External

Internal Reference: +5V ± 0.5%

External Reference: Shunt type, minimum value 1.0V

Sampling Types: Hardware Timed or Software Polled

Hardware Timed sampling started/stopped by software command

Minimum Time between samples (Hardware Timed Mode): 62.5µs per

channel (16K samples per second for 1 channel, 2k/sec for all 8 channels)

Maximum Sampling Time error: ± 0.5us

Overvoltage Protection: -10 to +15 V indefinitely

Maximum current draw at maximum overvoltage: 11mA

Max DC offset: ± 3 LSB and ±0.75mV (Total for 5V internal reference is

4.41mV)

Max Gain error: ± 4 LSb and ±Vref error (Total for 5V internal reference is

±0.1% + 0.5% = 0.6%)

Integral Linearity error (offset from best linear fit. Can’t be calibrated out.):

± 2 LSB (± 2.44 mV with internal 5V reference)

Total possible calibrated FSE: ±0.05%

Total possible uncalibrated error using 5V internal reference: (Reading *

.006) + .00441 + .00244 (This is 0.03685V at 5V full scale.)

Total possible uncalibrated FSE: ± 0.737%

Note:

Analog input values are the most recently read value and may include the

desired signal plus any noise and DC offset component.

The accuracy of any measurement equipment depends on the signal

integrity entering it. To realize the full potential of the UD128A8D, pay

careful attention to signal grounding, use input line shielding and twisted

pair wires to the inputs. Analog filtering for out-of-band signals and/or digital

filtering using oversampling may be required to meet end requirements.

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B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuale Utente Pagina 10