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N1411A Datasheet(PDF) 6 Page - Keysight Technologies |
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N1411A Datasheet(HTML) 6 Page - Keysight Technologies |
6 / 16 page 06 | Keysight | B2980A Series Femto/Picoammeter and Electrometer/High Resistance Meter - Data Sheet Solution 4. Optional software and dedicated accessories help mitigate cabling complexities When performing sensitive measurements making appropriate cabling connections is often one of the more difficult challenges. Many factors can contribute to measurement noise or instability, including incorrect cabling, poor cable quality and improper guarding; however, determining the root cause of a measurement fixturing issue from among all of these factors is not easy. Conventional instruments do not provide any help to solve these types of issues and they typically only offer written guidance on best practices. In contrast, the B2980A series has an available Setup Integrity Checker function that can identify noise caused by external elements (cables, adapters, shields, chambers, etc.) and display the information in tabular format on the front-panel GUI. As shown below, the setup integrity checker function allows you to compare the noise level of the instrument with no cables connected against the noise level with different setup elements connected. By comparing the noise level standard deviation of different setup elements side by side, you can easily determine the quality of cables and other setup elements necessary for your measurements. The B2980A series also has specialized accessories available to facilitate certain types of measurements. For example, the N1413A High Resistance Meter Fixture Adapter allows you to use the B2980A series with Keysight’s accessories for high resistance measurement (such as the 16008B Resistivity Cell). A High Resistance Measurement Universal Adapter (N1414A) is also available to simplify the cabling for high resistance measurements. How much faster is the B2980A series’ settling time? When comparing instrument settling times, you need to understand how each instrument defines this specification. Most conventional instruments define settling time as the time it takes to reach 10% of the final value, whereas the B2980A series uses a value of 0.1%. By reducing dielectric absorption (DA), the B2980A achieves a faster settling time using the 0.1% limit even in its lower measurement ranges as shown below. ± 0.1 % of final value Final value Conventional electrometer’s settling to 0.1 % B2980A settling to 0.1% Time 7 6 5 4 3 2 1 0 10% of final value 0.1% of final value 20 pA range settling time 2 V step, 100 GΩ, 1 PLC B2980A Conventional electrometer A The B2980A series is optimized for fast 0.1 % settling time. Case, Shield Cable A Cable B Connector A Connector B Take out DUT/sample before start checking Cable A Cable A Cable B NOISE Noise source finally isolated Original setup Example showing how to use the Setup Integrity Checker Expected noise level with Cable A Unexpected noise level with Cable B Challenge 4: Verifying the integrity of measurement cabling is essential for accurate measurements, but conventional instruments do not offer any means to validate cable performance. |
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