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Inspection and adjustment of output waveform of MR encoder
● When the MR head is disassembled and replaced, be sure to make an adjustment.
1. Device:
・Single-output rated voltage power-supply 1 unit: 5V 100mA
・ Oscilloscope 1 unit
・ Self-made tool
Caution:
If there is a problem with continuity between the contacts of the self-made tool and the relay FPC,
the contacting surface of the relay FPC may be dirty, eroded, or oxidized. So polish the contacts and
connect them.
2. Preparation of the lens for measurement
・ Assemble the MR-head-attached zoom index ring unit, the SWM, and the MF ring into the lens body.
Then connect the assembled lens to each measuring machines as follows:
【Attachment diagram】
・
PCB (Front)
To back side
Caution:
The connector of the back of
the PCB is not used.
MF coupling ring
A part
・How to inspect and adjust:
① Confirm that the electric current and voltage of the connected rated voltage power-supply are set values, then
Confirm that the electric current and voltage of the connected rated voltage power-supply are set values, then
turn it ON.
② Set the oscilloscope. �old "A" part of the SWM unit at three places firmly, and rotate the MR coupling ring
Set the oscilloscope. �old "A" part of the SWM unit at three places firmly, and rotate the MR coupling ring
with fingers.
Note: The waveform varies according to the rotational speed of the focus ring. So change "Time/Div"
setting accordingly.
1 unit
PCB (Back)
Oscilloscope (2ch)
Oscilloscope (1ch)
Rated voltage power-supply (+)
Rated voltage power-supply (-)
Metal area
GMR sensor FPC
"A" part of the SWM unit at three places firmly, and rotate the MR coupling ring
- Ａ ・AF-S VR 70-300/4.5-5.6G -
Rated voltage power-supply
(GND)
Self-made tool
Be careful NOT to touch the metal area of
the SWM unit.
INC
JAA79551-R.3690.A
Set value
( ＋ )
5.0 V
100 mA
Oscilloscope
(2ch type)
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