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AH 2550A Automatic Capacitance Bridge 1 kHz

AH 2550A Automatic Capacitance Bridge 1 kHz
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AH 2550A Automatic Capacitance Bridge 1 kHz
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  • Model: Andeen-Hagerling AH 2550A
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Capacitance measurement of unmatched precision   

AH 2500 Automatic Capacitance Bridge 1 kHz   

The Andeen-Hagerling Model 2500A measures capacitance and loss in medium and high impedance ranges, and thus allows using three-terminal rather than five-terminal connections to the unknown.

Its unmatched precision is the result of a uniquely designed ratio transformer: the culmination of 15 years of Andeen-Hagerling bridge design and manufacture. Equally important is the unique temperature-controlled, fused silica capacitance standard which allows extremely high measurement stability and immunity to mechanical shock.

These elements combine to form a true bridge operating at 1 kHz to give capacitance results which are independent of the exact test frequency.

Key features

  • Includes Option E for enhanced performance as standard
  • Accuracy of 3 ppm
  • Stability better than 0.5 ppm/year
  • Resolution of 0.5 aF and 0.07 ppm
  • Temperature coefficient of 0.01 ppm/°C
  • Measures extremely low loss:
    • Dissipation factor: 1.5 x 10-8 tan δ minimum
    • Conductance: 3 x 10-7 nS minimum
    • Resistance: 1.7 x 106 GΩ maximum
  • Full precision measurements in < 0.5 s, and repeated measurements on the same sample in under 40 ms
  • Capacitance and loss ranges cover negative values to allow for unusual samples or 3-terminal networks
  • Three-terminal BNC connections minimise connector costs and number of cables
  • Commutation (test signal reversal) to minimise external power line or other periodic signal pickup
  • Autoranging
  • IEEE-488 and RS-232 interfaces included. External device can serve as controller or logger
  • Programmable features can eliminate the need for an external controller
  • Full or abbreviated English language commands and error messages
  • Large, variable brightness, eight digit display of capacitance and loss
  • Deviation measurements of capacitance, loss, or both
  • Zero correction of test fixture capacitance and loss
  • External DC bias up to ± 100 volts
  • External trigger capability

Andeeen-Hagerling website

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A number of papers have been published by scientists around the globe who have used an AH2500/AH 2550A Automatic Capacitance Bridge within their research. Here are some examples: