Turntable encoder calibration – ETS-Lindgren 2087 Electric Powered Turntable 2 & 3 Meter Models (Archived) User Manual

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MODEL 2087 TURNTABLE SERIES

Operation

REV C – PN 399233

toggle into edit mode. The lowest adjustable digit will flash on
and off. Pressing the LOCAL key for that device will switch the
flashing digit to the next higher digit. In this way, it is possible to
rapidly adjust any digit of a multi-digit parameter or limit.

TURNTABLE ENCODER CALIBRATION

C Refers to the encoder calibration parameter. This setting is used
to convert the encoder count values returned from a motor base
into the corresponding centimeter or degree position reading. For
turntables, this represents the number of encoder counts per
revolution. Using this parameter, a variety of standard, retrofit,
and custom devices can be used. The setting for the Model 2087
Turntable Series is:

3600

If the given value does not appear to work correctly, the encoder
calibration value can be determined using the following procedure:

1. Set the encoder calibration value to 3600.

2. Insure that the turntable is positioned to allow more than a full

revolution of travel in the clockwise direction and use the
STEP keys to run the turntable clockwise a few degrees to
remove any play in the table.

3. Mark the current location of the turntable against the ground

ring (masking tape works well), and set the current position
reading to 000.0.

4. Using the STEP keys, rotate the turntable clockwise until it is

again aligned with the mark on the ground ring. For best
results, the last motion should always be in the clockwise
direction to insure that any play in the gearing between the
motor and encoder is accounted for.

5. Record the reading of the display, ignoring the decimal point

(i.e. 360.0 would be 3600). This is the encoder calibration
value.

NOTE: If the value is below 3600, the resolution of the
encoder is low and thus the 2090 will not provide 0.1 degree
resolution, even though the display shows that digit. If the
value has gone past 9999, the encoder has too many counts per

Archived 3/18/10