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Farringdon Instruments Limited .Unit 9 Oriel Court . Omega Park . ALTON .
Hampshire GU34 2YT. Telephone 01420 541591.
www.farringdoninstruments.co.uk
Farringdon Instruments Limited .Unit 9 Oriel Court . Omega Park . ALTON .
Hampshire GU34 2YT. Telephone 01420 541591.
www.farringdoninstruments.co.uk
The RCA50 Series of Tachometers
Installation and Operating Instructions
The RCA50 Series of Tachometers
Installation and Operating Instructions
Revision 6
Revision 6
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Summary of Contents for Farringdon RCA50 Series
- Page 1 The RCA50 Series of Tachometers Installation and Operating Instructions Farringdon Instruments Limited .Unit 9 Oriel Court . Omega Park . ALTON . Hampshire GU34 2YT. Telephone 01420 541591. Revision 6 www.farringdoninstruments.co.uk The RCA50 Series of Tachometers Installation and Operating Instructions Farringdon Instruments Limited .Unit 9 Oriel Court .
- Page 2 Contents Introduction and Outline Specification Fitting Your Tacho Mounting the Tacho Connecting the Tacho The Push Button Shift Lights Setting Up Your Tacho Using the Push Button Number of Cylinders Tell-Tale and Other Modes Ignition Pulse Filter Shift Light Settings Resetting the tell-tale.
- Page 3 Introduction Notes The Farringdon RCA50 Series of tachometers are believed to be the first available with stepper motor driven main and tell-tale hands. The tell-tale hand is a very useful feature especially when used in its auto-reset mode and not just an extra hand to make it look more like historic chronometric types.
- Page 4 Fitting Your Tachometer Mounting the Tachometer The RCA50 tachometer is 80 mm in diameter and the hole in your dash should accept this diameter. It will require 60 mm behind the dash to accommodate the depth of the in- strument and the clamping studs. An ‘O’...
- Page 5 Connecting the Tachometer The tachometer is supplied with flying leads so that you can fit the connector of your choice to the car loom. The table lists the functions of the five free wires. Wire Colour Function Connect To Black Ground or Earth Ground or Chassis 12 volt Supply...
- Page 6 Check set up. Set to factory maximum rpm recorded since it was last reset. correct rpm incorrect setup (start of section 3) and start again. Call Farringdon for help. Violet Wire Main hand drops to 0 Filter setting is too high...
- Page 7 Farringdon for advice on sensors that you can fit to your engine is held at a steady 3000 rpm. If the needle is steady, engine for this purpose. When the engine is running faster than try at full speed under load.
- Page 8 switches to 12 volts when the lights are on. mounted in the engine bay. The Push Button Connect the violet wire of the filter unit to the violet wire of the tacho. The push button should be mounted where you can reach it while being able to read the tacho.
- Page 9 These are The Tacho Filter Unit is a simple filter contained in a small plastic box that may be required when using a Farringdon the number of cylinders or pulses form the engine for RCA5x Tacho with contact points ignition systems. It may every two turns of the engine be of use with some electronic systems as well.
- Page 10 Shift Light Settings (tell-tale at 4 and 5) Using the push button The next two settings are for the shift lights. Use the push button to set the rpm at which you would like the first and Having the tell-tale hand makes setting up very easy as the second shift lights to illuminate.
- Page 11 In order to allow for uneven firing engines, Farringdon uses ner of the original mechanical chronometric movements. the number of trigger pulses in two full turns of the engine This action is switched off after reaching 5000 rpm for 0 to to calculate the rpm.
- Page 12 Mode (tell-tale at 2) Tell-Tale Modes The following table shows the value to set for the mode: The tell-tale needle on original chronometric tachometers was mechanically pushed to the highest reading reached by the main hand. The tell-tale could be reset by pushing a Mode Tell-Tale Trigger Pulse...