MoTeC ACL VIM - Manual (Page 69)

MoTeC Appendices 65
Appendix D: VIM Input Specifications
Analogue Inputs
VIM Analogue Input Specifications
Input
Type Qty Update
Rate
(Hz) ++
Analogue
Filter
(Hz) * Digital
Filter Bits Effective Input
Resistance
(ohms)
AV 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
Type Gain
Range Range & Resolution
at Gain = 1 Range & Resolution
at Gain = 64
AV F 1 0 to 5V, 1.22 mV steps N/A
AV H 1-64 0 to 5V, 153 uV steps 0 to 78 mV, 2.38 uV steps
AV 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.