AT / ATH Tachometers

Improved quality New, easy one-button calibration procedure Every model will accept all signal sources: alternator, magnetic pickup or ignition Easy ring clamp for installation LED backlight

The AT Series tachometer is a rugged instrument with solid-state circuitry for indication of engine RPM. It is equipped with a ring nut for mounting into a standard 3-3/8 in. (86 mm) dash mounting hole. A full 240° sweep of the pointer gives an accurate indication on a large easy–to–read scale, and the dial can be illuminated for night reading. The ATH Series model is also equipped with hourmeter to record the elapsed running time of an engine.

These instruments are designed to function with Alternator, Magnetic Pickup or Ignition signals from:

• pulses generated by an alternator with 4, 8, 12, 14 or 16 poles on the rotor (3 - 52 PPR);
• pulses obtained from the ring gear of an engine by means of an electromagnetic sensor (magnetic pickup). The instrument is designed to function with flywheels having anywhere from 50 to 300 teeth;
• 2 - 10 cylinder, 4 cycle spark-ignited engines. Not intended for use with Capacitive Discharge (CD) ignitions or magnetos, only for inductive, automotive-type ignitions.

The tachometers are powered by a 12- or 24-volt battery and are reverse polarity protected. These units are for negative ground or isolated electrical systems. They are specially designed for use on truck, marine, industrial or stationary engines.

Specifications

• Power Input: 10-32 VDC (100 mA max at 32 VDC, does not include backlight)
• Backlight: LED, Red (75 mA max at 32 VDC)
• Accuracy:
  • Tachometer: +2% full scale
  • Hourmeter: +/- 0.02%

• Temperature Range: -40 to 185° F (-40 to 85° C)
• Dial (Face Plate): 240° sweep with white numerals
• Bezel: 304 stainless steel
• Scale: 0-3000 RPM
• Case Material: Nylon, 12% glass filled
• Hourmeter Range: 99999.9 hours in 0.1 increments.
• Electromagnetic Compatibility: 2004/108/EC
• IP66 front and IP32 back (vented case)
• RoHS Compliant

For more information about this product, you can download the related literature here:

• Sales Bulletin (1511813)
• Installation Manual (00020986)
• Manufacturing Change Notice (00-02-0790)
  • UK Manufacturing Change Notice - Supplement for 3000RPM EMEA Models (yi6514)
• Supplement: Magnetic Pickup Installation Instructions (00-02-0181)

Archived Literature

• Discontinued ATA/ATS/ATHA/ATHS/ATHI Models (2011 - 2016):
  • Sales Bulletin (American Markets) [OLD VERSION] (97026)
  • Sales Bulletin (EMEA Markets) [OLD VERSION] (ys6473)
  • Installation Instructions [OLD VERSION] (00-02-0260)
  • Application note: transition to 2012 models (EMEA markets) (yi6474)
• Discontinued ATA/ATS/ATHA/ATHS/ATHI Models (Pre-2011):
  • Installation Instructions [OLD VERSION] (00-02-0258)
  • Advisory note for 24 to 12V voltage convertors, sleeved resistor type (EMEA markets) (yi6434)