Omega Vehicle Security OMP-MODL manual MLIM-2 Frequency Input Application

Figure 3... -

21:

Frequency

icon

(MLIM-2)

3... INTERFACE MODULES

CAUTION: Note that a direct connection exists between the common (-) terminal on all four channels of the MLIM- 2 (

Figure 3... -22). When connecting to multiple event or counter signal sources sharing a common ground or reference, insure that the source’s ground or reference is connected to the terminal strip `common’ terminal to prevent shorting out of the source signal and possible damage to the MLIM-2.

For most counter and event applications, shielding is not necessary due to the relatively low input impedance of the channel and the high noise immunity of the MLIM-2 channel input.

MLIM-2; FREQUENCY INPUT APPLICATION

An MLIM-2 channel configured as a Frequency type input can measure input frequencies ranging from 5Hz to in excess of 20KHz. The channel will accurately measure frequencies of sine, square, or sine approximating input waveforms with peak to peak amplitudes of 300mVDC to 15VDC. Channel input impedance is greater than 30K ohm within the specified input range.

The MLIM-2 incorporates an AC coupled front-end amplifier for use with low amplitude signals ( see AMP inFigure 3... -22).

	V+	Current Limited Output Driver
	R1		Count / Event Signal
Connections	C		Debounce RC
	A
	B
	COM		Software Controlled
Strip			Debounce Circuit
	D	C1	Amplified Frequency
	COM
Terminal			AMP
	N/C
	N/C
2-	COM		ML059
HLIM	N/C
	N/C
	COM
	HyperLogger
	Circuit Ground

Figure 3... -22: Simplified schematic of MLIM-2 input channel (single

channel shown)

3-34 USING THE OMP-MODL