Model A701-2A/B High-precision Platform Tiltmeter The model A701-2 Platform mount tiltmeter is our most popular design for high precision tilt measurements. Units come with built in invar leveling legs, for easy installation on any horizontal surface. The A701-2 also includes two switchable gains and two low-pass filter settings. Using an absolute gravity referenced electrolytic sensor, the A701 delivers ultra-high sensitivity to <0.1 μrad with virtually zero long-term drift. Output is a stable ±8 DC voltage (±16 VDC differential). Rugged, reliable, and extremely accurate, the A701-2 is the preferred choice for volcano monitoring, high-precision geotechnical engineering, bridge deflection monitoring, precision metrology, radar platform leveling, and high-accuracy tilt monitoring applications worldwide. Model A701-2A (High-gain) Model A701-2B (Mid-Range) ±800 μradians (+/-0.046°) ±0.8° ±8000 μradians (±0.46°) ±8.0° 0.1 μradian/mV 0.1°/V Scale Factor 1 μradian/mV 1°/V 0.2% 0.2% Non-Linearity 2% 1.5% Resolution 0.1 μradians 1.0 μradians Repeatability 1 μradians (static) 2 μradians (static) Time Constant Filter on: 7.5 sec; Filter off 0.5 sec Filter on: 7.5 sec; Filter off 0.4 sec Kz Temp Coefficient (deg/C) ±3 μradians/°C (typical) ±0.001°/°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 operation; -30 to +100°C storage Dimensions 6 x 6 x 4 inches (15 x 15 x 10 cm), 3 lb (1.4 kg) Materials Anodized and painted aluminum Cable 3m (10 ft) multiconductor cable + overall shield, PVC jacket, connectors included Specifications subject to change without notice on account of continued product development Angular Range High-Gain: Low-Gain: High-Gain: Low-Gain:: High-Gain: Low-Gain: Ordering Code Description Power/signal cable, 10-conductor (specify total length on order) Female panel receptacle (mates to 62302 connector included with tiltmeter) Extra female in-line receptacle (one included with tiltmeter) Jewell Instruments LLC 850 Perimeter Road, Manchester, NH 03103 [email protected] • www.jewellinstruments.c

High-precision Platform Tiltmeter sensor well eveling screw (invar) tilt sensor well, pigtail with tinned filter gain switch switch base plate Jewell Instruments LLC 850 Perimeter Road, Manchester, NH 03103