The ALCTE is a low cost version of the ALCT, available only to academic customers and designed especially for them. This version of the ALC provides many features not available to industrial customers, such as a versatile function generator and data acquisition module along with optional photo detector support. The ALCTE is a USB based instrument which can be connected conveniently to both desktop and laptop computers. The ALCTE's easy-to-use software allows for the measurement of both positive and negative dielectric nematic liquid crystal materials. The ALCTE offers the measurement of material parameters for ferroelectric liquid crystals as well. The range of material parameters measured by the ALCTE includes:
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For NLC (Positive Dielectric Anisotropic Material): · Threshold Voltage · Splay and Bend Elastic Constants · ε⊥ and ε|| Dielectric Constants · Ion Density and Mobility* · Electrical Resistivity* · Rotational Viscosity |
For Negative Dielectric Anisotropic Nematic Material: · Threshold Voltage · Splay and Bend Elastic Constants · ε⊥ and ε|| Dielectric Constants · Ion Density and Mobility* · Electrical Resistivity* |
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For FLC: · Spontaneous Polarization · Electrical Switching Time · Optical Switching Time · Rotational Viscosity · Ion Density and Mobility* · Electrical Resistivity* · Dielectric Constant |
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* Resistivity and ion density measurement of ALCTE are designed for academic use only. The minimum current measurement is 1nA. For current measurement down to 10pA, please refer to the IV1.
The ALCTE can also be integrated with Instec's microscope thermal stages and temperature controllers. This enables the user to analyze the temperature dependence of the above parameters.
Technical Specifications
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Output Wave
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DC to 10KHz, voltage 0 to ±100V
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Output Update Rate
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500KHz
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Output Resolution
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16 bit
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Input Resolution
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16 bit
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Input Sample Rate
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500KHz
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Current Measurement Range
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1nA ~ 1mA
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Current Sensing Resistance
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10K, 100K, 1M, and 10MΩ
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Current Resolution
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100pA
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Post Gain in the ALCT Box
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1, 10, 100, 1000
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Capacitance Measurement
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2pF to 100nF
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