Closed Loop Galvanometer Series: 6860

The 6860 series of closed loop galvanometers combines Cambridge Technology's moving magnet actuator technology and our patented moving dielectric capacitive position detector design. This combination offers superior positioning speed and higher resolution accuracy and repeatability of any moving magnet galvanometer. The 6860 family scanning systems can be designed and optimized for speed, size, cost and accuracy with typical beam diameters between 5 and 30 mm.

Model 6860 Moving Magnet Capacitive Position Detector Optical Scanner

Supports 5 mm and 10 mm apertures.

Galvanometer Specifications

All Position Detector specifications apply with Cambridge Technology servo driver after a 30 second warm-up. All angles are in mechanical degrees. Consult manual for complete operating instructions.

Mechanical Specifications

Rated Angular Excursion:		40°
Rotor Inertia:		0.6 gm*cm², +/-10%
Torque Constant:		9.3X10⁴dyne-cm/amp, +/-10%
Maximum Coil Temperature:		110°C
Thermal Resistance (Coil to Case):		1.5°C/Watt, Max

Electrical Specifications/Drive Mechanism

Coil Resistance:		1.5 Ohms, +/-10%
Coil Inductance:		160uH, +/-10%
Back EMF Voltage:		0.17mV/degree/sec, +/-10%
RMS Current:		4.6 Amperes at Tcase of 50°C, Max
Peak Current:		25 Amperes, Max
Small Angle Step Response Time:		0.5ms, with balanced inertia matched load

Position Detector

Linearity:		99.9%, Minimum, over 40 degrees
Scale Drift:		50PPM/°C, Maximum
Zero Drift:		15 microradians/°C, Maximum
Repeatability, Short Term:		8 microradians
Output Signal, Common Mode:		585 microamperes with AGC voltage of 10VDC, +/-20%
Output Signal, Differential Mode:		14.5 µA/degree, at common mode current of 585 µA, +/-20%

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