High Resistance Meter 4329A

The HP4329A is a solid-state insulation resistance meter designed for easy, accurate and direct readings of very high resistance values. It is also useful for measurements in electrical components such as capacitors, transformers, switches and cables.

Seven fully regulated DC test voltages (between 10 and 1000 Vdc) are provided as test sources. The 4329A is instantly convertible from ungrounded-to-grounded-sample operation via a simple relocation of the front panel ground strap from “guard” to “+” position.

Resistance range: 500 kΩ to 2 x 10¹⁶ Ω

Resistance accuracy: ±10% of reading except on Rmax range after initial ∞ and full-scale calibration. Accuracy depends on the deflection angle of the meter. At the low resistance end of each scale, typical accuracy is ~±3%, near center scale ~±5%. On all voltage ranges, if multiplier is set to Rmax, add 3% (above effective upper limits, accuracy is not specified.)

Test voltages: 10 V, 25 V, 50 V, 100 V, 250 V, 500 V, 1000 V

Current range: 0.05 pA to 20 µA

Current accuracy: ±5% using ideal current source of infinite impedance. For finite source impedances, accuracy is determined by the range register, which sets meter input impedance. These vary from 10⁴ Ω to 10¹¹ Ω, depending on the range selected. This additional error can be large, and should be calculated if the current measurement capability of the 4239A is to be used

Recorder output: 0 to 100 mVdc, proportional to meter deflection, output impedance 1 kΩ

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