The Andeen-Hagerling AH 2500A is a 1 kHz automatic capacitance bridge designed to deliver exceptional stability, resolution, and accuracy in both manual and automated capacitance and loss measurements. Operating at a fixed test frequency of 1 kilohertz, the AH 2500A is built around a uniquely designed ratio transformer and a temperature-controlled, fused silica capacitance standard. These elements combine to form a true bridge that provides capacitance results independent of the exact test frequency, with measurement immunity to mechanical shock that makes the instrument suitable for laboratory, factory-floor, and portable field use.

The AH 2500A is applied to calibration work including use as a transfer standard in primary and secondary laboratories, fuel gauge calibration, measurement of cryogenic temperatures, thermal expansion measurements for metals and non-metals, radiation measurements using crystalline structures, humidity measurements, thickness measurement of metals and dielectrics, liquid and vapor level measurements, AC resistance measurements to 1000 teraohms, displacement and strain measurements, characterization of insulating media (solid, liquid, or gas) including detection of contaminating water per ASTM D150 and D924, detection of contaminants in refrigerants, monitoring of chemical reactions, research and production testing of capacitance and loss based sensors, and pressure measurements ranging from high vacuum to high pressure. The instrument is specifically suited to applications involving very small changes in capacitance or loss due to its high resolution and stability.

ValueTronics offers the Andeen-Hagerling AH 2500A from our 20,000 square foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, where every {{CONDITION}} instrument is inspected and verified by our in-house technicians before shipment. Unlike drop-ship resellers and online marketplaces that simply forward listings, we physically hold inventory, perform functional checks, and stand behind every unit we sell — giving precision metrology customers a verified instrument from a known source rather than a description from an unknown seller.

Brand Heritage

Andeen-Hagerling, Inc. was incorporated in 1982 in Solon, Ohio (a suburb of Cleveland) by Carl Andeen and Carl Hagerling. The company traces its technical origins to 1966, when Andeen began Ph.D. research at Case Western Reserve University that required precision ratio-transformer based capacitance measurements. Andeen-Hagerling remains privately owned and continues to manufacture precision capacitance bridges under the same name today, with no acquisitions or rebrands in its history.

Compare Other Models in This Series

The Andeen-Hagerling AH 2500A sits within Andeen-Hagerling's family of precision 1 kHz capacitance bridges, which also includes the AH 2550A and the higher-end AH 2700A. The AH 2500A specifically targets applications requiring 5 ppm accuracy (or 3 ppm with Option E) at a fixed 1 kHz test frequency, with three-terminal BNC connections for medium- and high-impedance unknowns.

The bridge is offered in a standard configuration and with the optional Option E precision-enhancement package. Option E improves accuracy from 5 ppm to 3 ppm, stability from 1 ppm/year to 0.5 ppm/year, resolution in ppm from 0.15 to 0.07, and temperature coefficient from 0.03 ppm/°C to 0.01 ppm/°C. All other specifications — range, measurement time, interfaces, packaging, and operating environment — remain identical between standard and Option E configurations.

Each new AH 2500A model listed below is its own dedicated product page with condition-matched pricing and availability. Verify the specific configuration — standard or Option E — that matches your accuracy and stability requirements before ordering.

The AH 2500A standard configuration delivers 5 ppm accuracy and 1 ppm/year stability — sufficient for the majority of precision capacitance and loss measurement applications including calibration transfer, dielectric characterization, and sensor-based industrial measurement. For applications requiring the highest available precision at 1 kHz, Option E provides a documented enhancement path with the same physical instrument and interface set.

Within the AH 2500A family, the meaningful differentiator is the Option E precision-enhancement package. Option E modifies five specification categories: accuracy (5 ppm → 3 ppm), stability (1 ppm/year → 0.5 ppm/year), ppm resolution (0.15 → 0.07), temperature coefficient (0.03 ppm/°C → 0.01 ppm/°C), and the corresponding non-linearity and absolute resolution expressions. Absolute resolution in attofarads (0.5 aF) is the same for both configurations.

All other AH 2500A specifications — range, frequency (1.0000 kHz ±0.005%), measurement time options (40 ms to 20 minutes), test voltage range (0.5 mV to 15 V RMS), DC bias capability (±100 V), IEEE-488 and RS-232 interfaces, packaging (3.5 inches high, 18 lbs), operating temperature (0° to 45°C), and the three-year warranty — are identical across configurations. The comparison table that follows shows the side-by-side specification differences.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Accessories Supplied

• Hardware for rack mounting
• Bail for bench top use

Product Core & Specifications

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.