Agilent/HP 1154A 500 MHz Differential Probe

Agilent/HP 1154A 500 MHz Differential Probe
Manufacturer: Agilent / HP
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Agilent/HP 1154A 500 MHz Differential Probe

 

Agilent/HP 1154A 500 MHz Differential Probe

Rent me for $200 a month

For the Infiniium Series Oscilloscopes

   The 1154A is a wide-band differential active probe. The probe features low noise, low input capacitance, high common mode rejection, and Field Effect Transistor (FET) buffered inputs in the probe head. User-selectable offset gives the probe flexibility to measure a large range of signal types. Plug-on attenuators and AC coupling accessories further extend the application range. Included interconnect accessories allow connection to surface mount and through-hole components with minimal signal degradation. The input receptacles in the probe head are compatible with standard 0.025" (0.635 mm) square pins, which provide a convenient low-cost method of creating device characterization test fixtures. The 1154A is ideal for acquiring high speed differential signals such as those found in disk drive read channels, differential LAN, video, etc. The high impedance characteristics of both inputs allow the probe to be used as a FET probe to make single-ended measurements in digital systems without introducing a ground loop as a conventional FET probe would.

   The 1154A Differential Probe is a high input impedance amplifier. A characteristic of differential amplifiers is the ability to reject signals that are common to the two inputs. The common mode rejection ratio (CMRR) is the measurement of this ability. It is expressed as the ratio between the amplitudes of the common mode and differential signals that produce equal outputs. These measurements can be referred to the probe input, if the differential gain is known. The CMRR is usually expressed in dB: The CMRR is only specified for unity Gain. The ability to reject common mode signals depends on the balance designed into the probe amplifier. As the frequency of the common mode signal increases, it becomes harder to balance the amplifier parasitic parameters. This leads to degradation of the CMRR.

   The CMRR of the 1154A Differential probe is specified from the probe tip. This method of specifying the probe CMMR eliminates the effects of source impedance, provided the connections from the probe tip to the signal source are symmetrical.

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