Model A603 High-Precision Platform-Mount Tiltmeter The model A603 platform mount tiltmeter is our new model designed to fill the gap left by the obsoleted 520M. Units come with the same leveling worm-gear feet that were on the 520M. The A603 also includes two switchable gains and two low-pass filter settings. Using an absolute gravity referenced electrolytic sensor, the A603 delivers ultra-high sensitivity to <2.5 nrad with virtually zero long-term drift. Output is a stable ±8 DC voltage (±16 VDC differential). Rugged, reliable, and extremely accurate, the A603 is the preferred choice for volcano monitoring, high-precision geotechnical engineering, precision metrology, radar platform leveling, and high-accuracy tilt monitoring applications worldwide. Angular Range Scale Factor High-Gain: Low-Gain: High-Gain: Low-Gain:: Model A603-A (High Gain) ±200 μradians (±0.0115°) ±2000 μradians (±0.115°) 25 nradian/mV 250 nradian/mV Model A603-C (Ultra High Gain) ± 20 μradians (±0.00115°) ± 200 μradians (±0.0115°) 2.5 nradian/mV 25 nradian/mV Non-Linearity 2.0% Resolution <25 nradians <2.5 nradians Time Constant Filter on: 7.5 sec; Filter off 0.5 sec Kz Temp Coefficient (deg/C) ±3 μradians/°C (typical) Ks Temp Coefficient (%/°C) 0.05%/°C (typical) Output ±8VDC (single ended); ±16VDC (differential) Channels X-tilt, Y-tilt, Temperature Output Impedance 270 ohms Temperature Output 0.1°C/mV typical (single ended; 0°C = 0mV) Power ±11 to ±15 VDC @ +11 and -6mA, 250 mV ripple max, reverse polarity protected Environmental -25 to +70°C operational; -30 to +100°C storage; IP50 Seal Dimensions 9.25 x 9.25 x 5 inches (24 x 24 x 12.7 cm), Weight: (estimated) 10.5 lbs (2.7 kg) Materials Anodized and painted aluminum dome, Stainless Steel base and hardware Specifications subject to change without notice on account of continued product development Ordering Code: A603-A “High gain” with 5 meter tethered cable A603-C “Ultra High Gain”, with 5m tethered cable Jewell Instruments LLC 850 Perimeter Road, Manchester, NH 03103 [email protected] • www.jewellinstruments.co

Model A603 High-Precision Platform-Mount Tiltmeter Side view Jewell Instruments LLC 850 Perimeter Road, Manchester, NH 03103 [email protected] • www.jewellinstruments.com • Tel (800) 227-5955 8/25/16