F-CVP-1 non-contact capacitive voltage probe

CISPR 22 F-CVP-1
Introduction
The Fischer Custom Communications, Inc. non-contact capacitive voltage probe (F-CVP-1) is used to measure the common mode voltage appearing between a multi-pair balanced cable bundle and the local ground reference for the cable bundle in accordance with CISPR 22 Section C.1.3 (shown on the reverse side of this page). The F-CVP-1 makes this voltage measurement without requiring direct contact with the metallic conductors in the cable bundle, or requiring physically breaking the cable bundle to install the F-CVP-1.

The F-CVP-1 consists of 2 concentric metal electrodes. A capacitive voltage divider is formed by the capacitance between the cable bundle under test and the inner metal electrode of the F-CVP-1, and the capacitance between the inner and outer metal electrodes of the F-CVP-1. A Fischer Custom Communications, Inc. proprietary circuit buffers and amplifies the voltage from this capacitive divider, and provides a voltage out of the F-CVP-1 for direct input into a 50 W signal or spectrum analyzer.
The F-CVP-1 meets the critical requirement to minimize capacitive loading of cables under test. If the loading is greater than 5 pico farads the overall impedance of the cable can be significantly lowered and result in erroneous common mode voltage and current measurements.
Specifications
Operating Bandwidth: 9 kHz – 100 MHz
Nominal Probe Gain: - 20 dB
Nominal Gain Flatness: (150 kHz – 30 MHz): +/- 0.2 dB: (9 kHz – 100 MHz): +/- 1.5 dB
Dynamic Range: 80 dB minimum
Minimum Measurable Signal (1kHz detection bandwidth): 10 dBµV
Maximum Measurable Signal: º10 V
Maximum diameter of wire/cable bundle under test: 2 cm for < 5 pF nominal loading for cable/bundle under test
Probe Power Source: Internal rechargeable NiMH or NiCad, or disposable Alkaline (10 size AA)
Battery Life: 40 hours minimum
Battery Charger: External, powered from 120 VAC
Recharging Time (maximum): 14 hours
Output Connector: Type N (female)
Overall Dimensions (approximate): 7.7 inches High X 5.0 inches Wide X 8.0 inches Long (19.6 cm X 12.7 cm X 20.3 cm)
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20603 Earl Street • Torrance, CA 90503 • Tel: (310) 303-3300 • Fax: (310) 371-6268
E-mail: sales@fischercc.com