Photocell System
The Chadwick-Helmuth Photocell System is used to accurately measure rotational psition for determining phase relationship between elements of rotating devices such as propellers, rotor blades, fans and shafts at repetition rates of 0.2 to 830 pulses per second. The Photocell Kit No. 10252 is used with the Chadwick-Helmuth Series 8500 Balancer Analyzer, 192A Spectrum Analyzer and Velocimeter Balancers.
The Photocell System measures repetition rates for rotating devices, without affecting balance, tracking or vibration characteristics of the rotating device. The retro-reflective tape is attached to the surface of the rotating device to provide a reflective target for the optical Probe. The Optical Probe is attached to a stationary mounting near the target so that the light transmitted from the Optical Probe is reflected back to the Optical Probe each time the rotating target passes. The light that is reflected back to the Optical Probe is sent to the Photocell Processor for signal processing.
The Photocell System signals are unaffected by external light such as sunlight, strobe or pulse light, and other ordinary lighting sources.
Specifications
| Dimensions - Optical Probe | |
| Length | 2.3 in. (5.9 cm) |
| Width | 1.3 in. (3.3 cm) |
| Height | .6 in. (1.5 cm) |
| Weight | .08 lb. (36 g) |
| Dimensions - Photocell Processor | |
| Length | 5.6 in (14.0 cm) |
| Width | 3.2 in (8.1 cm) |
| Height | 1.6 in (4.1 cm) |
| Weight | .65 lb. (295 g) |
| Dimensions - Battery Pack | |
| Length | 4.0 in (10.1 cm) |
| Width | 3.2 in. (8.1 cm) |
| Height | 1.6 in. (4.1 cm) |
| Weight | .65 lb. (295 g) |
| Speed Range | 12 to 50,000 RPM |
| Operating Range | 1/2 in. to 26 in. (1.3 to 66 cm) |
| Input Power | 11 to 32 VDC at 80 MA |