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
Multi-frequency
| Models | AH 2700A (Option-E) | AH 2700A Option-C (Option-E) |
|---|---|---|
| Frequency response | 50 Hz - 20 KHz | 50 Hz - 20 KHz |
| Measurement frequencies | 33 preset frequencies | continuous |
| Resolution Capacitance | up to Sub aF (atto Farad) | up to Sub aF (atto Farad) |
Single frequency
| Model | AH 2550A |
|---|---|
| Frequency response | 1 KHz |
| Measurement frequencies | 1 KHz |
| Capacitance Resolution | bis Sub aF (atto Farad) |
