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MoTeC Appendices 65

Appendix D: VIM Input Specifications

Analogue Inputs

VIM Analogue Input Specifications

Input

Type

Qty Update

Rate

(

)

Analogue

Filter

(

)

Digital

Filter

Bits Effective Input

Resistance

(

ohms

)

V F 6 5000 4400 8xAvg ** 12 66k

AV H 8 500 330 6.4kHz # 15 150k (Gain=1)

4.7k (Gain=64)

AV S 2 2000 720 6.4kHz # 15 150k (Gain=1)

4.7k

(

Gain=64

)

AV D 8 1000 360 6.4kHz # 15

+Sign

150k (Gain=1)

>1M (Gain>1)

AV SPD

2 100 7000 None 12 90k @

VIM Analogue Input Specifications Continued

Input

Gain

Ran

Range & Resolution

at Gain = 1

Range & Resolution

at Gain = 64

AV F 1 0 to 5V, 1.22 mV steps N/A

V H 1-64 0 to 5V, 153 uV steps 0 to 78 mV, 2.38 uV steps

V S 1-64 0 to 5V, 153 uV steps 0 to 78 mV, 2.38 uV steps

AV D 1-64 -5 to +5 V differential,

0 to 5 V absolute,

153 uV steps

***

-78 to +78 mV differential,

0 to 3 V absolute,

2.38 uV steps

AV SPD

1 0 to 10.3 V, 2.5 mV steps N/A

++ If the channel is logged at a lower rate than the update rate an optional

anti-alias filter can be applied which averages the values between each log

event. In this case the effective update rate is equal to the logging rate. The

anti-alias filter causes a phase shift equal to half the logging rate. The anti-

alias filter also affects the real time value of the channel which is filtered and

updated at the logging rate or at 50 Hz whichever is greater. If the channel is

not logged then the real time value is updated at 50 Hz.

* First order RC type. The frequency is the 3 dB point.

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