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university:courses:alm1k:circuits1:alm-cir-voltage-divider [03 Nov 2021 20:17] – [Activity: Frequency Compensated Voltage Dividers] Doug Merceruniversity:courses:alm1k:circuits1:alm-cir-voltage-divider [17 Jan 2023 15:34] (current) – [Experiment to compensate for the input capacitance of the ALM1000] Doug Mercer
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 =====Experiment to compensate for the input capacitance of the ALM1000===== =====Experiment to compensate for the input capacitance of the ALM1000=====
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 +<note>The ADALM1000 (Rev. F version) has the ability to separate the voltage measurement connection from the voltage / current output pin, the Split I/O mode control in the AWG settings. The size of the parasitic capacitance is significantly different when using the CH A/B pins in Hi-Z mode vs using the AIN/BIN pins. The required external compensation capacitor value will be very different between the two pins. </note>
  
 ====Materials:==== ====Materials:====
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 ====Oscilloscope Probes:==== ====Oscilloscope Probes:====
  
-A 10X passive oscilloscope probe uses a series resistor (9 MΩ) to provide a 10:1 attenuation when it is used with the 1 MΩ input impedance of the scope itself. A 1 MΩ impedance is standard for most oscilloscope inputs This enables scope probes to be interchanged between oscilloscopes from different manufacturers. Figure is the schematic for a typical 10X probe. 10X oscilloscope probes also allow some amount of frequency compensation to allow for variations in the scope channel input capacitance. A capacitor divider network is designed into the probe as shown. The adjustable capacitor connected to ground can then be used to equalize the frequency response of the probe.+A 10X passive oscilloscope probe uses a series resistor (9 MΩ) to provide a 10:1 attenuation when it is used with the 1 MΩ input impedance of the scope itself. A 1 MΩ impedance is standard for most oscilloscope inputs This enables scope probes to be interchanged between oscilloscopes from different manufacturers. Figure 6 is the schematic for a typical 10X probe. 10X oscilloscope probes also include some amount of frequency compensation adjustment to allow for variations in the scope channel input capacitance. A capacitor divider network is designed into the probe as shown. The adjustable capacitor connected to ground can then be used to equalize the frequency response of the probe.
  
 You can find more information on how to connect the scope probe BNC connector to your breadboard circuit or the inputs of the ALM1000: [[ez>adieducation/university-program/b/blogs/posts/simple-way-to-connect-bnc-cables-to-active-learning-modules| Connect BNC Cables to Active Learning modules]] You can find more information on how to connect the scope probe BNC connector to your breadboard circuit or the inputs of the ALM1000: [[ez>adieducation/university-program/b/blogs/posts/simple-way-to-connect-bnc-cables-to-active-learning-modules| Connect BNC Cables to Active Learning modules]]
university/courses/alm1k/circuits1/alm-cir-voltage-divider.txt · Last modified: 17 Jan 2023 15:34 by Doug Mercer

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