"LIGHT SOURCE-LIGHT EMITTING DIODE;THREE CHANNEL-SINE,COSINE,AND INDEX;OUTPUT TYPE-BALANCE LINE DRIVER,FAIRCHILD 9614;RATED SPEED-5000 RPM;TIMING-COSINE CHANNEL LEADS SIN BY 90 DEGREES PLUSORMINUS 45 DEGREES FOR CW ROTATION,SINE CHANNEL LEADS COSINE BY 90 DEGREES PLUSORMINUS 45 DEGREES FOR CCW ROTATION; TEMPERATURE RANGE - OPERATION -54 DEG C TO +52 DEG C AND STORAGE -54 DEGR C TO +70 DEG C;FREQUENCY RANGE,EACH CHANNEL-0 TO 20 KHZ"