ZST Speedome­ter

Street Rodder - - Early Iron -

If you are us­ing the new Clas­sic In­stru­ments speedome­ters with ZST tech­nol­ogy and have a speed sig­nal from a com­puter, you may need to use an in­line sig­nal fil­ter. The ZST speedome­ter is made to read many sig­nals, some of which are low volt­age at slow speeds. The speedome­ter needs to be very sen­si­tive to read the low volt­age sig­nals and is there­fore sus­cep­ti­ble to in­ter­fer­ence that may be on the sig­nal wire. Sig­nals from com­put­ers are known to have in­ter­fer­ence and may cause the speedome­ter to “act” like a tachome­ter when not mov­ing. The SN79 sig­nal fil­ter will elim­i­nate in­ter­fer­ence on the sig­nal wire and still al­low the ac­tual speed sig­nal to pass through.

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