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@@ -44,7 +44,7 @@ PICA addresses this gap by functioning as a turnkey application rather than as a
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PICA’s architecture is designed to be highly configurable, enabling users to readily adapt it to their specific requirements and to implement user‑defined protocols in addition to the standard measurement protocols already provided. It eliminates the need for reconfiguring the measurement setup to achieve comprehensive characterisation, enabling continuous operation across the full range from Delta-mode low-resistance measurements (the current reversal technique effectively removes constant offsets and improves the signal-to-noise ratio) to high-impedance electrometric measurements, ranging from low-noise superconductors to high-band gap insulators (covering 24 orders of magnitude in resistance) using a single unified framework.
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Pyroelectric measurement performed using an electrometer enables highly sensitive characterization of ferroelectric phase transitions by detecting extremely small pyroelectric currents, with a resolution on the order of $10^{-15}$ A.The impedance analyzer enables the characterization of dielectric anomalies over the frequency range from 20 Hz to 2 MHz and is utilized for magnetodielectric and photoinduced characterization across a wide variety of multiferroic systems. Thus, the primary objective of PICA is to serve as a robust software platform that enables advanced, high‑precision characterisation of materials.
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The system is currently validated with industry-standard hardware, including the AC-DC current source (Model: 6221, Keithley), the Nanovoltmeter (Model:2182, Keithley), the Electrometer (Model:6517B, Keithley), the DC Source Measure Unit (Model:2400, Keithley), the impedance analyser (Model: E4980A, Keysight), and the temperature controller (Model: 350/340, Lakeshore). While the current implementation drives specific instruments, the underlying framework is highly customizable.Researchers using different hardware models need only replace the specific SCPI commands with their instrument equivalent commands to utilise the suite.
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The system is currently validated with industry-standard hardware, including the AC-DC current source (Model: 6221, Keithley), the Nanovoltmeter (Model:2182, Keithley), the Electrometer (Model:6517B, Keithley), the DC Source Measure Unit (Model:2400, Keithley), the impedance analyser (Model: E4980A, Keysight), and the temperature controller (Model: 350/340, Lakeshore). While the current implementation drives specific instruments, the underlying framework is highly customizable.Researchers using different hardware models need only replace the specific SCPI (Standard Commands for Programmable Instruments) commands with their instrument equivalent commands to utilise the suite.
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It differentiates itself through the following unique features:
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***Fault Tolerance:** PICA prevents hardware timeouts or driver crashes from freezing the main dashboard by isolating control logic from the user interface, which is a critical advantage over single-threaded scripts.
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***Modular CLI Architecture:** As demonstrated in the repository, measurement modules also contain CLI measurement module counterparts that allow researchers to utilise PICA's measurement protocol and logic for headless automation or integration into other workflows without GUI overhead.
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***Modular CLI Architecture:** As demonstrated in the repository, measurement modules also contain CLI (Command-line interface) measurement module counterparts that allow researchers to utilise PICA's measurement protocol and logic for headless automation or integration into other workflows without GUI overhead.
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***Operational Transparency:** Unlike a black box solution, PICA exposes real-time, time-stamped command logs for each measurement module, such as `[10:05:25] Keithley 6221: Ramping current to 10 mA`. Rejecting hidden automation and replacing the "black box" paradigm with transparent console logs that show every command sent to the instrument, thereby aiding debugging, ensuring the scientific reproducibility of experimental results, and allowing researchers to verify measurement protocols and troubleshoot hardware instantly.
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