HEIDENHAIN ERA 881 C Incremental Modular Angle Encoder
The HEIDENHAIN ERA 881 C is an incremental modular angle encoder with a segment-length steel scale tape and tension springs for the outside diameter of a machine element. Ask AMI about repair, replacement or sourcing for your exact unit; availability and the right replacement path are confirmed before quoting. This page does not claim stock. Legacy model: it is no longer listed in HEIDENHAIN's current modular angle encoder catalog.
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Representative ERA 800 series image.
Technical data
| Model | ERA 881 C |
|---|---|
| Type | Incremental modular angle encoder: scanning unit and one-piece steel scale tape (up to 30 m) |
| Version | Circle-segment version, scale tape secured with tensioning elements |
| Scale-slot diameter (outside) | 317.99 mm, 458.04 mm or 572.63 mm (indicate when ordering; other versions on request) |
| Mounting | Scale tape on the outside diameter of a machine element |
| Line count | Segments, e.g. 72°: 5,000 / 144°: 10,000 (317.99 mm); 50°: 5,000 / 100°: 10,000 / 200°: 20,000 (458.04 mm); 160°: 20,000 (572.63 mm) |
| System accuracy | See the catalog's measuring accuracy section for segment versions |
| Accuracy of the graduation | ±3 arc seconds |
| Incremental signals | 1 Vpp |
| Reference mark | Distance-coded, nominal increment of 1000 grating periods |
| Cutoff frequency | -3 dB: 180 kHz or higher |
| Recommended measuring step for position capture | 0.0002° (317.99 mm), 0.0001° (458.04 mm), 0.00005° (572.63 mm), by scale-slot diameter |
| Power supply | 5 V ±10%, max. 150 mA without load |
| Electrical connection | Cable 3 m with M23 coupling; max. cable length 150 m |
| Mechanical speed | Up to 100 rpm |
| Permissible axial motion of measured shaft | ±0.2 mm |
| Vibration / shock | 100 m/s2 (55 to 2000 Hz) / 1000 m/s2 (6 ms) |
| Operating temperature | -10 to 50 °C (14 to 122 °F) |
| Protection | IP 00 |
| Weight | Scanning unit approx. 0.35 kg; scale tape approx. 30 g/m |
Specifications from the manufacturer's July 2005 angle encoder catalog. Catalog data for the full-circle and segment versions is shared; segment versions are made to order by segment angle. Confirm the full ID number, interface and mounting dimensions from your encoder's nameplate before ordering; send the nameplate and we will confirm fit.
Catalog pages: ERO 785 and ERA 700 / ERA 800 series specifications (PDF, 8 pages).