Service Manual TNC 407 / TNC 415 - heidenhain - DR. JOHANNES ...

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11.3.1 Electrical Check of Encoders
SERVICE MANUAL TNC 407/415
Issue: 01.09.1995
Page 50
In order go give a precise statement on the electrical function of an encoder, it must be measured with a phase
angle measuring unit (PWM), an oscilloscope and an impedance tester. (see operating instructions Encoder
Diagnostic Kit)
If no phase angle measuring unit is available, the electrical state of the cable, the lamp and the photocells of
an encoder can be checked with an ohmmeter. The following resistances must be measured at the connector
of the encoder:
Encoder connector housing against machine housing (external shield) R