The HP 4329A is a precision high resistance meter engineered for measurement of very high resistance values spanning 500 kΩ to 2 × 10¹⁶ Ω. Built around a self-oscillating parametric converter circuit with variable-capacitance diode bridge, the instrument converts minute DC currents to AC oscillations, eliminating drift and noise inherent in traditional chopper and vacuum tube designs. This solid-state architecture delivers accurate resistance and current measurements critical for quality control, research, and development in insulation characterization and component validation.
Technical Specifications
Resistance Measurement
• Range: 500 kΩ to 2 × 10¹⁶ Ω
• Accuracy: ±3% at low resistance end; ±5% near center scale; ±10% near upper limit; additional ±3% when multiplier set to Rmax
• Test Voltages: 10 V, 25 V, 50 V, 100 V, 250 V, 500 V, 1000 V (all ±3%)
Current Measurement
• Range: 5 × 10⁻¹⁴ A to 2 × 10⁻⁵ A (8 ranges)
• Minimum measurable current: 0.05 pA
• Accuracy: ±5% of full-scale deflection, plus ±3% at top decade
• Input impedance: 10⁴ Ω to 10¹¹ Ω depending on selected range
Physical & Electrical
• Recorder Output: 0 to 100 mV DC, 1 kΩ output impedance
• Power: 115/230 V ±10%, 50–60 Hz, ~3 VA
• Dimensions: 155 mm H × 198 mm W × 204 mm D
• Weight: 3.5 kg
– Key Features
• Seven regulated DC test voltages eliminate measurement uncertainty from supply variation
• Variable-capacitance diode bridge parametric conversion suppresses DC drift and chopper noise
• Instant sample configuration switching via front-panel ground strap relocation—no rewiring required
• Decade-selectable input impedance accommodates finite source impedances in high-impedance applications
• Analog recorder output enables continuous logging of resistance and current trends
– Typical Applications
Insulation quality assessment in synthetic resins, porcelain, and oils. Component validation in capacitors, transformers, and cable insulation. Leakage current characterization in high-impedance circuits.
– Compatibility & Integration
The HP 16008A Resistivity Cell integrates with the 4329A for volume and surface resistivity measurement of sheet insulation up to 125 mm W × 125 mm D × 7 mm H.
