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Farringdon RCA5 Series - User Manual

Farringdon RCA5 Series
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The RCA50 Series of Tachometers
Installation and Operating Instructions
Revision 8

Questions and Answers

  • N
    Nathan TateAug 5, 2025
    What to do if Farringdon Measuring Instruments shift lights do not work?
    • G
      gonzalesbrandiAug 5, 2025
      If the shift lights on your Farringdon Measuring Instruments aren't working, first, ensure they are wired correctly, connecting black to black. Then, verify that the RPM settings for the shift lights are properly configured.
  • L
    Loretta MendezAug 9, 2025
    Why Farringdon Measuring Instruments tacho does not show correct rpm?
    • M
      michael59Aug 10, 2025
      If your Farringdon Measuring Instruments tacho is displaying an incorrect RPM, the trigger pulse setting might be off. To resolve this, reset to the factory setup (refer to the start of section 3) and begin the setup process again. If issues persist, consider contacting Farringdon for further assistance.
  • H
    Heather StaffordAug 14, 2025
    How to fix unsteady main hand on Farringdon RCA5 Measuring Instruments?
    • W
      William HarringtonAug 15, 2025
      If the main hand on your Farringdon Measuring Instruments is unsteady, it could be due to an irregular or too short trigger pulse. Try increasing the filter setting, or consider fitting a Filter Unit to stabilize the reading.
  • D
    Dr. Edwin GalvanAug 19, 2025
    What to do if Farringdon RCA5 Measuring Instruments tacho runs against stop but shows no rpm?
    • D
      Danny SmithAug 20, 2025
      If your Farringdon Measuring Instruments tacho runs against the stop upon power on but doesn't display any RPM, the issue might be a missing or incorrect trigger pulse. Ensure the trigger pulse exceeds 5 volts and drops below 0.2 volts. Setting the trigger pulse filter to 1 might also help.
  • R
    robert62Aug 25, 2025
    Why Farringdon RCA5 Measuring Instruments main hand drops to 0 above a certain rpm?
    • M
      marisawilsonAug 25, 2025
      If the main hand on your Farringdon Measuring Instruments drops to 0 above a specific RPM, the filter setting may be too high. Try reducing the filter setting to correct this issue.
  • O
    Oscar GarnerAug 29, 2025
    How to troubleshoot no tacho hands movement on Farringdon RCA5 Measuring Instruments?
    • J
      John HaysAug 29, 2025
      If the tacho hands on your Farringdon Measuring Instruments aren't moving when turned on, it could be due to a lack of power. Check for +12 volts between the red and black wires to ensure sufficient power supply.

Summary

Introduction

Outline Specification

Technical specifications for the RCA50 Series tachometers, including voltage, pulse, current, and accuracy.

Fitting Your Tachometer

Mounting the Tachometer

Instructions for physically installing the tachometer, covering diameter, depth, and clamping methods.

Connecting the Tachometer

Detailed wiring instructions for connecting the tachometer's flying leads to the vehicle's electrical system.

Push Button Installation

Guidance on mounting and using the push button for setup and reset functions.

Shift Light Installation

Instructions for fitting and positioning the shift lights.

Setting Up Your Tachometer

Using the Push Button for Setup

How to use the push button to navigate settings, increase/decrease values, and confirm choices.

Setting Number of Cylinders

Procedure to set the number of engine cylinders for accurate RPM calculation.

Configuring Operating Modes

Selecting the desired mode, including tell-tale and chronometric operation settings.

Adjusting Trigger Pulse Filter

How to set the trigger pulse filter to ensure reliable signal reception from the engine.

Setting Shift Light RPM

Configuring the RPM points at which the shift lights will illuminate.

Resetting the Tell-Tale

Steps to reset the tell-tale hand to zero or its last recorded maximum.

The Filter Unit

Purpose of the Filter Unit

Explains the function of the filter unit in cleaning ignition signals for older tachometers.

Filter Unit Fitting Instructions

Step-by-step guide for physically connecting the filter unit to the tachometer and vehicle.

Filter Unit Commissioning

Procedures for testing and verifying the correct operation of the filter unit.

Troubleshooting

Tacho Hands Not Moving

Diagnosing and fixing issues where the tachometer hands do not move on power-up.

Tacho Shows No RPM

Identifying causes and solutions for the tachometer displaying zero RPM.

Incorrect RPM Reading

Troubleshooting steps for when the tachometer displays an inaccurate RPM.

Main Hand Drops to Zero

Addressing the issue where the main tachometer hand drops to zero at higher RPMs.

Unsteady Main Hand

Solutions for an unsteady or fluctuating main tachometer needle.

Shift Lights Not Working

Checking wiring and settings to resolve issues with non-functional shift lights.

Farringdon RCA5 Series Specifications

General IconGeneral
BrandFarringdon
ModelRCA5 Series
CategoryMeasuring Instruments
LanguageEnglish