Instrumentation
Bulk Current Injection Probes
Fischer Custom Communications, Inc. develops and manufactures Bulk Current Injection Probes [BCI Probes] to meet specific customer requirements and to perform compliance testing in accordance with Mil-Std-461/462, RTCA/DO-160 Section 20 and 22, Bellcore TR-NWT- 001 089, SAE Jl5447, EN 55101-4 and CSEFA-2 EuroFighter and other susceptibility specifications.
Bulk Current Injection Probe Fixtures
Probe Calibration fixtures are a part of the test equipment required by most of the Bulk Current Injection [BCI] Test Procedure Specifications. These test fixtures allow the user to quickly and easily calibrate a Bulk Current Injection Probe prior to performing compliance testing.
Current Monitor Probes
The Current Monitoring probes may be used whenever RF current measurements are required. Current measurements are made by placing a current carrying conductor within the “sensing” window of the probe and measuring the probe’s output voltage with an RF detector. Calibration of the probe permits the conversion of the voltages measured to current. Current measurements can be made over the frequency range shown in the transfer impedance curve furnished with each probe. There is virtually no loading of the circuit and the technique permits normal operation of the device under test during measurements.
Current Monitor Probe Fixtures
Calibration fixtures are a part of the test equipment required by most of the Bulk Current Injection Test Procedure Specifications. This test fixture allows the user to quickly and easily calibrate the injection probe prior to performing the compliance testing.
CISPR 32 ISN
CISPR 32 defines ISNs as specialized coupling decoupling devices used to measure the conducted asymmetric common mode radio interference voltages of an ITE. Fischer Custom Communications, Inc. ISNs meet the requirements of CISPR 32 and we offer models for measuring conducted emissions on single, two and four balanced pair telecom ITE’s. All meet the requirements for Longitudinal Conversion Loss, common mode impedance, phase, decoupling isolation and voltage division factor.
Coupling Decoupling Networks (CDN)
The common mode current disturbance signal can be delivered to the EUT using a variety of coupling networks to inject the signal onto the unscreened cables, shielded cables, balanced cables, coaxial cables and power mains. Decoupling networks are used to insure that the disturbance signal does not influence the auxiliary equipment and are placed between the EUT and the auxiliary equipment.
150-50 Ω Adapters
The Fischer Custom Communications, Inc. non-contact 150-50 Ω Adapters 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 32. 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.
Capacitive Voltage Probe
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 32. 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.
EM Injection Clamps and Fixtures
Fischer Custom Communications, Inc. offers clamp-on and fixed-aperture EM Injection Clamps, which offer unique benefits compared to conventional EM Injection Clamps.
DCN
The DCN is a decoupling ferrite tube that is used with an EM Injection Clamp. The DCN fully complies with IEC 61000-4-6 Edition 4.0.
LISN
A Line Impedance Stabilization Network (LISN) is a precision RF network device deployed in series between a facility power source and the Equipment Under Test (EUT) during conducted and radiated radio-frequency (RF) emission and susceptibility evaluations. Its application is governed by a broad range of internationally recognized Electromagnetic Compatibility (EMC) and Electromagnetic Interference (EMI) test standards and protocols. The LISN performs three critical functions within the test environment:
- Impedance Stabilization — Establishes and maintains a stable, well-defined impedance at the EUT's power input terminals across a designated frequency spectrum, ensuring measurement accuracy and repeatability.
- RF Isolation — Effectively decouples the EUT from extraneous conducted RF noise present on facility power lines, thereby preventing external interference from corrupting test results.
- Conducted Emissions Measurement — Provides a standardized, reproducible measurement port for the quantification and analysis of conducted emissions generated by the EUT.
- RTCA DO-160 — Environmental conditions and test procedures for airborne equipment
- MIL-STD-461 — EMC requirements for military and defense systems
- CISPR 16 / ANSI C63.4 — Radio disturbance measurement instrumentation and methods
- CISPR 25 — Limits and methods for the protection of receivers in vehicles and boats
Surface Monitor Probes
Surface Monitor Probe is a half clamp-on probe with a dielectric cover on the sensing window. Surface Probe measures currents on metallic conductors with flat regions such as ground planes, striplines, printed wiring boards, bundles of wire and architectural structures.
Telcom Surge CDN
Surge Coupling-Decoupling Networks (SCDN) are used to couple the surge specified in IEC 61000-4-5 onto active telecom lines to determine if the telecom equipment sustains functional upset or damage due to the surge. The Surge CDN maintains all of its Technical Specifications while delivering the full range of open circuit voltage to short circuit current demanded by the EUT load.
TEM Cell
FCC Custom Communications, Inc. offers a family of Transverse Electromagnetic (TEM) cells that can be used for both emissions and immunity testing.