Capacitance bridges

Precision capacitance measuring bridges

The capacitance measuring bridges from the manufacturer Andeen-Hagerling offer a capacitance resolution down to the sub-attofarad (10^-18 F!)

These measuring bridges have proven themselves for many years in a wide range of applications and are the basis for corresponding publications:

• Dielectric characterization
• Quantum capacitance
  (carbon nanotubes, nanowires, quantum dots, graphene)
• Dilatometry, thermal expansion, magnetorestriction
• Ferroelectrics, multiferroics
• Liquid crystals
• Low temperature physics
• Magnetoresistive effects, magnetic capacitance
• Magnetometry
• Nano-force detection/metrology
• Glass/glass-liquid transition
• Electrical and capacitance metrology

General Specifications
(Option-E: with improved accuracy)

• Measurable dissipation factor up to 1,5 × 10^-8 tan(δ),conductivity 3 × 10^-7 nanosiemens — equivalent to a resistance of 1,7 × 10⁶ GΩ
• Analog output (3 kHz at 3 dB)
• Negative loss and capacitance measurement ranges to measure unusual samples or 3 terminal networks
• Commutation (test signal inversion) to minimize external network influences or other periodic pick-up signals
• IEEE-GPIB and IEEE-1174 serial interfaces
• Programmable (may not require external controller)
• Deviation — measurements (capacitance, loss — or both)
• External DC bias up to +/- 100 V
• Reference standard capacitances available — Model AH 1100