# ANSI/IEEE impulse tachometric dynamo symbol

Canonical URL: https://eloragrid.ai/symbols/ansi-impulse-tachometric-transducer
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: TP
Drawing use: Schematic
Reference families: IEEE / ANSI, Manufacturer

## Symbol convention

Convention: IEEE / ANSI
Form: Autodesk IEEE-oriented Instrumentation and Sensors form: Tachometric Dynamo - Impulse
Autodesk publishes this block under its IEEE Symbol Preview. The counterpart is the matching functional concept in the library; no equivalence of every detailed standard graphic is asserted.
Related representation: [Impulse tachometric transducer](https://eloragrid.ai/symbols/iec-impulse-tachometric-transducer)

IEEE-library impulse tacho form for a speed sensor that outputs pulses at a rate set by shaft speed.

## In plain English

### What does ANSI/IEEE impulse tachometric dynamo mean?

The impulse form represents a speed device that turns a measured quantity into a signal whose output is a pulse train, for example a magnetic pickup reading gear teeth or a pulse generator on the shaft. The receiving device counts pulses, so the number of pulses per revolution is the scaling factor that must accompany the symbol.

### A simple example

Pulse transducers may be passive magnetic pickups with amplitude rising with speed, or active sensors needing a supply. The symbol does not distinguish these, so supply wiring and input type at the receiver should be checked separately.

### What the drawings help you do

Record pulses per revolution for scaling. Check whether the sensor is passive or needs a supply. An impulse device that turns a measured quantity into a signal outputs a pulse rate; a tachometric dynamo outputs an analogue voltage.

### This particular reference

IEEE-library impulse tacho form for a speed sensor that outputs pulses at a rate set by shaft speed. An impulse device that turns a measured quantity into a signal outputs a pulse rate; a tachometric dynamo outputs an analogue voltage.

### Terms

- Signal: Electrical information passed between devices, rather than necessarily the main power supply.
- Schematic: A drawing showing function and connections rather than physical appearance.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [Autodesk IEEE Symbol Preview — Instrumentation and Sensors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm)
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/)


## What it represents

The impulse form represents a speed transducer whose output is a pulse train, for example a magnetic pickup reading gear teeth or a pulse generator on the shaft. The receiving device counts pulses, so the number of pulses per revolution is the scaling factor that must accompany the symbol.
Pulse transducers may be passive magnetic pickups with amplitude rising with speed, or active sensors needing a supply. The symbol does not distinguish these, so supply wiring and input type at the receiver should be checked separately.

## How to read it

- Record pulses per revolution for scaling.
- Check whether the sensor is passive or needs a supply.

## Information to show or reference

- State pulses per revolution
- Show sensor supply if active
- Use screened cable to the counter input

## Important distinction

An impulse transducer outputs a pulse rate; a tachometric dynamo outputs an analogue voltage.

## Facts

- Convention evidence: Autodesk IEEE Symbol Preview, Instrumentation and Sensors
- Public vendor block name: HIN1B12 / VIN1B12 (Autodesk identifier; not an IEEE symbol number)
- Output: Pulse train whose rate follows shaft speed
- Artwork scope: Original functional illustration; exact standard glyph and compliance are not certified

## Public references

- [Autodesk IEEE Symbol Preview — Instrumentation and Sensors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm) — Autodesk. Public IEEE-oriented Instrumentation and Sensors preview listing the Tachometric Dynamo - Impulse block and its vendor identifier.
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Graphic-symbol standards context and official status; not a source of reproduced artwork.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.