Omega Vehicle Security OMP-MODL manual Shielded Twisted Pair Lead, Frequency Signal Connection

3... INTERFACE MODULES

Frequency Signal Connection:

To utilize an MLIM-2 channel as a Frequency input, connect the input signal positive lead to one of the four Input terminals (Chan A, B, C, or D) and the negative lead to one of the four Common terminals on the module terminal strip (Figure 3... -23). Note that all of the four Common terminals are interconnected and connect directly to the OMP-MODL circuit ground.. Refer to Chapter 7 for steps to generate a Terminal Strip Wiring printout for use in making field wiring connections.

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 frequency 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 frequency signal and possible damage to the MLIM-2.

For Frequency recording applications with small signal amplitude, high frequencies, long lead length and/or in noisy environments, twisted pair wire will provide extra noise immunity. In extremely noisy applications, shielded wire may be required. If shielded wire is used, the shield at the OMP-MODL end should be connected to an external earth ground (Figure 3... -23) or if available, a grounded Shield connection provided on another type installed interface module (such as the MLIM-1).

NOTE: Do not ground the shield wire at the end away from the OMP-MODL.

Terminal Strip

Shielded Twisted Pair Lead

	A B	C	D
ChannelChannelCommonChannelChannel

Frequency	1	2	3	4	5	6
	+
Source A
	-
						ML060
Frequency	+
Source B
	-
	Shield
		Earth Ground

Figure 3... -23: Frequency input terminal strip connections (two inputs shown)

USING THE OMP-MODL 3-35