ATI Technologies SmartTachSmartTach, User Manual

Page: 46 / 110

PARAMETERS
Page 4-16 SmartTach Operating Manual
22 - Trigger Input Attenuator
Parameter Group:
TrgInp
Options:
AtOff
- Attenuator disabled
AtOn
- Attenuator enabled
Default:
AtOff
- Attenuator disabled
Purpose: This parameter is used to optionally increase the dynamic range of
the Trigger input signal conditioning circuit to increase noise
immunity with strong signals. When this parameter is enabled, the
SmartTach effectively applies a divide-by-five Attenuator to the
input signal. This also places approximately a 12Kohm resistive load
across the input.
How to Set: For most applications, this parameter should be left in the disabled
setting. This parameter should be enabled only when the input
signal level exceeds 5 volts peak (and never drops below 3 volts
peak). The signal source should also have a relatively low output
impedance (under 1000 ohms).
NOTE: When parameter 20 is set to TS1, this parameter will be set to
Auto and cannot be changed.