Motec ACL VIM Manual do Utilizador descarregar pdf (Página 70)

66 Appendices

** Inputs are sampled at 40 kHz, 8 samples are averaged to give a 5 kHz

update rate.

*** This specification only applies if the gains of a group of four inputs are all

set to 1 otherwise the differential range is -3 V to 3 V and the common mode

range is 0 V to 3 V absolute. There are two groups of four inputs; AVD1-4 and

AVD5-8.

# 5th order digital sync filter. The frequency specifies the 3 dB point.

## These inputs are not intended for precision measurements, they are

intended for checking the voltage levels of the speed sensors.

@ Input set to magnetic type.

VIM Pull-up Resistor Pins

The Pull-up Resistor pins R1 to R4 have a 1000 ohms resistor internally

connected to the 5 V sensor supply.

VIM Analogue Input Sampling Times

This table shows the time at which each input is sampled relative to an

arbitrary zero point.

Where multiple VIMs are used, all VIMs are precisely synchronised so that the

same inputs on each VIM sample at exactly the same time.

Input Sample

Time

(usec)

Update

Rate

(Hz)

AV F1 100 5000

AV F2 100 5000

AV F3 100 5000

AV F4 100 5000

AV F5 100 5000

AV F6 100 5000

AV H1 1550 500

AV H2 1800 500

AV H3 50 500

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 98 99

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Motec ACL VIM Manual do Utilizador Página 70