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Products

Wideband Instrumentation

North Hills has developed a complete series of Instrumentation Bridges and accessories to characterize communication systems and networks. These products simplify the measurements and easily interface with 50 and 75 ohm network analyzers.

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 Balance to Ground Measurements 

LBB Series Longitudinal Balance Bridges

LCL and LCTL balance measurements to ground per ITU-T Recommendation O.9
Interface with 50 and 75ohm network analyzers.
Balanced impedances 100, 110, 120, 135, 150ohm
Models cover 10kHz - 300MHz.
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CMI Series of Common Mode Injectors

Apply longitudinal signals to balanced networks in two-port balance tests.
Measure common mode rejection of baluns.
50 and 75ohm coax input impedance.
Balanced impedances 100, 110, 120, 135, 150ohm
Models cover 10kHz -300MHz
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 Return Loss Measurements 

RLB Series Return Loss Bridges for Balanced Networks

Interface with 50 and 75ohm network analyzers
Measure return loss for balanced
impedances 100, 110, 120, 135, 150ohm
Models cover 10kHz - 300MHz
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RLT Series Return Loss Bridges for Twinax Balanced Networks

Interface with 50 and 75ohm network analyzers
Measure return loss for balanced impedances 78, 95, 100, 124, 150ohm
Models cover 10kHz - 300MHz
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RLC Series Return Loss Bridges for Coax Networks

Interface with 50 and 75ohm network analyzers
Measure return loss for coax impedances: 50, 75, 93ohm.
Models cover 10kHz - 300MHz
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 System Noise Susceptibility Measurements 

BF Series Unbalanced to Highly Balanced Signal Converters with Common Mode Injectors

Measure system susceptibility to noise and interference
Convert signals from a coax source to a highly balanced output.
50ohm coax input impedance.
Balanced outputs 100, 110, 120, 135, 150ohm
Models cover 10kHz - 100MHz
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VDSL Measurements

ANSI Standard T1.424-2004 Annex F (pages 146-155)

Compliance testing of VDSL Network-End Service Splitters.
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ANSI Standard T1.424-2004 Annex E (pages 135-145)

Compliance testing of VDSL Remote (Customer) End Service Splitters.
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C.I.S.P.R 17/IEC 1981 Measurements

Balun Transformers for C.I.S.P.R 17/IEC Measurements


The NH16434 and NH16435 are optimized for C.I.S.P.R 17/IEC measurements.
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Balanced Impedance Adaptor for Impedance Analyzers and LCR Meters

Balanced Impedance Adaptor for Impedance Analyzers and LCR Meters 100Hz to 10MHz


To facilitate high-accuracy impedance measurements, inputs to Impedance Analyzers and LCR Meters are configured as four-terminal Kelvin connections. 
The impedance levels are 50ohm balanced to 50ohm unbalanced.
The frequency range is 100Hz to 10MHz.
The NH16552 is equivalent to the Agilent 16314A.  
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Application Notes: