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Model A701-2 Platform Tiltmeter

The Model 701-2 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. The output is a stable ±8 DC voltage (±16 VDC differential). The D701 digital version has onboard memory, with a storage capacity of up to 22,000 samples.




Additional information

Weight 48 oz
Dimensions 6 × 6 × 4 in

• Rugged, reliable, and extremely accurate
• Weatherproof 4X version available
• Ultra-high sensitivity to <0.1 µrad with virtually zero long-term drift


• Volcano monitoring
• High-precision geotechnical engineering
• Bridge deflection monitoring
• Precision metrology
• Radar platform leveling
• High-accuracy tilt monitoring

Performance Specifications

High GainMid-Range
Linear Range (°)High Gain: ±0.046
Low Gain: ±0.25
High Gain: ±0.8
Low Gain: ±5.0
Scale FactorHigh-Gain: 0.1 µradian/mV
Mid-Range: 1µradian/mV
High-Gain: 0.1°/V
Mid-Range: 1°/V
Non-linearity (%)High-Gain: 0.2
Mid-Range: 2%
High-Gain: 0.2
Mid-Range: 1.5
Repeatability1µradian (static)2µradian (static)
Time ConstantFilter on: 7.5 sec
Filter off 0.5 sec
Filter on: 7.5 sec
Filter off 0.4 sec
Kz Temp Coefficient (°/C, typical)±3µradian ±0.001µradian
Ks Temp Coefficient (%/°C, typical)0.05
OutputSingle-ended: ±8Vdc
Differential: ±16Vdc
ChannelsX-tilt, Y-tilt, Temperature
Output Impedance (Ω)270
Temperature Output0.1°C/mV typical (single ended; 0°C = 0mV)
Power±11 to ±15 Vdc @ +11 and -6mA, 250 mV ripple max, reverse polarity protected
EnvironmentalOperational: -25 to +70°C
Storage: -30 to +100°C
MaterialsAnodized and painted aluminum
Cable3m (10 ft) multiconductor cable + overall shield, PVC jacket, connectors included


A701-2 Datasheet
Outline Drawing
A700s User Manual