LeCroy LECROY AP031 32 OM free download

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AP031/AP032 Differential Probe Operating Instructions AP031/032-OM-E Revision B - November 1996 I. Application a. Overview The AP031 / AP032 are fully differential active probes designed for applications where electrical signals must be measured relative to a floating voltage different to the oscilloscope ground potential. These probes are specifically designed for situations where: - The reference voltage may be several hundreds volts above or below ground. - Measurements require the rejection of common mode signals. - Ground loops and currents produce to excessive signal interference. The use of these probes ensures safe operation of the oscilloscope and maintains high signal fidelity with good common mode rejection and dynamic range. b. Fully Differential Inputs The probe is a fully differential active device. The differential capability allows measurements to be made between two points in a circuit without reference to ground. The two input signals are processed inside the probe (see figure 1) and the resulting single-ended signal may be measured by any grounded oscilloscope. Because the differential voltage is calculated within the probe, with only the resultant difference signal being passed to the oscilloscope, a large dynamic range can be achieved with excellent rejection of common mode signals. Figure 1 c. Making Measurements Ensure the probe is fitted with four high-quality, AA cells. These should be cells that are protected from leakage which could damage the power supply contacts in the probes. Before making any measurements or connections refer to the safety information contained in this document. Connect the probe to one of the oscilloscope input channels ensuring the BNC connector is fully mated, and the safety ground lead to the oscilloscope CAL BNC connection. Select the proper range setting on the probe using the slide-switch on the probe body. Figure 2 Adjust the input coupling impedance and attenuation of the oscilloscope channel to which the probe is connected using the input coupling menu as shown in Figure 2. Ensure 1 M input impedance ( `DC1M ' or `AC1M ' ) is selected. The use of 50 input impedance will unduly load the output of the differential probe resulting in reduced amplitude output and incorrect scaling. To ensure the oscilloscope correctly interprets the vertical waveform scale be sure to adjust the probe attenuation setting using the `Probe Atten' menu controls. The example shown, x100 probe attenuation, would achieve correct vertical scaling AP031 operating with a maximum range of