Innalabs has two testing laboratories: a testing laboratory located in the city and a special nonmagnetic testing laboratory located 100 km away from the city. The second laboratory is located in a rural area far away from industrial areas, transport communications and electric mains.

The special testing equipment is used for system and sensor calibration. Below you can find a brief description of the Innalabs testing equipment.

The Optical Dividing Head (ODH) is a high-accuracy angle-setting device with an angular positioning accuracy of ±5 angular seconds over the full range of 0 to ± 360°. The ODH (see Fig. 1) is used for accelerometer and AHRS testing.

Figure 1. The Optical Dividing Head ODHE-5

The temperature chamber TIRA mini TCC 4016 is used for conducting temperature tests. The temperature setting error of the chamber is ±0.3°C over the whole -40°C to +140°C range. The chamber with ODH (see Fig. 2) allows conducting temperature calibration of accelerometers and AHRSs.

Figure 2. The temperature chamber TIRA mini TCC 4016 with Optical Dividing Head ODH-5E

Our Ideal Aerosmith temperature chamber 1291TC with a 1291BR single axis positioning and rate table has an effective interior volume of approximately 130 litres and allows working in the temperature range of -75°C to +180°C with a temperature setting accuracy of ±0.5°C. The rotating table allows setting angular rates up to 2000 deg/sec with an accuracy of 0.01% (per 1 revolution). Its payload capacity is 23 kg and its tabletop diameter is 203 mm. This equipment is used for gyro and AHRS tests and is shown in figure 3.

Figure 3. The Ideal Aerosmith temperature chamber 1291TS with a table 1291BR

The temperature chamber VTM7004 with an Acutronic AC120-S single axis positioning and rate table has an effective interior volume of approximately 37 litres and allows working in the temperature range of -70°C to +180°C with a temperature setting accuracy of ±0.5°C. The rotating table allows setting angular rates up to 3000 deg/sec with an accuracy of 0.001% (per 1 revolution). Its payload capacity is 20 kg and its tabletop diameter is 250 mm. This equipment is used for gyro and accelerometer testing and shown in figure 4.

Figure 4. The temperature chamber VTM7004 with a rotating table AC120-S

Special Nonmagnetic Equipment
(located in the nonmagnetic laboratory shown in figure 5)

The non-magnetic theodolite 3T2KP-NM (see Fig. 6) is an angular positioning device with two mutually orthogonal (vertical and horizontal) axes which allows positioning at fixed heading angles with an accuracy of ±2 angular seconds over the 0 to 360° range. The range of setting the inclination is from -45 to +45°C.

The theodolite is used to test the AHRS heading accuracy in real Earth magnetic field environment under normal conditions.

Figure 6. The nonmagnetic theodolite 3T2KP-NM

The 3-axes Helmholtz coils system from Billingsley Aerospace & Defense, Inc. (USA) with a non-magnetic temperature chamber inside (see Fig. 7) is a one-meter 3-axes Helmholtz coils system which can remove all the outer magnetic fields and apply its own magnetic field with any value and direction you need. Closed loop servo amplifiers maintain the set field values stable to <0.1 nT with 0.1% gradient in a centrally located 10 cm sphere. The coils orthogonality is better than ±0.1°C.

The Helmholtz coils are used to simulate the Earth magnetic field in various directions. This is a commonly-used alternative method for heading tests instead of positioning an AHRS in various directions relatively to the Earth magnetic field.

Figure 7. The 3-axes Helmholtz coils with a nonmagnetic temperature chamber

The non-magnetic temperature chamber inside the coils is used to test AHRS in the temperature range from -40°C to +70°C.