Advantest R6441B 4½‑Digit Multi‑functional Digital Multimeter

The Advantest R6441B is a 4½-digit digital multimeter engineered for precision measurement across DC, AC, and specialized test functions. Dual-channel input with dual display capability enables simultaneous measurements, making it ideal for R&D laboratories and production test environments. True RMS AC measurement, AC + DC combined measurements, and frequency analysis deliver versatility for complex signal characterization.

Battery operation extends field deployment capability.

Technical Specifications

• 4.5-digit resolution


• Maximum display: 199,999 (2.5 samples/second); 1,999 (80 samples/second)


• Selectable sampling rates: 2.5 times/second or 80 times/second Voltage Measurement


• DC ranges: 20 mV to 1,000 V


• AC ranges: 200 mV to 700 V


• DC accuracy: ±0.04% ±5d (20 mV–200 V); ±0.04% ±2d (2,000 mV)


• AC accuracy: ±0.6% ±35d (20–45 Hz); ±0.2% ±30d (45 Hz–20 kHz); ±0.5% ±30d (20–30 kHz); ±4% ±50d (30–100 kHz)


• Input impedance: ≥1 GΩ (20–200 mV); 10–11.1 MΩ ±1% (≥20 V); 1.1 MΩ ±10% AC input


• DC maximum allowable: ±500 V; AC maximum: 800 Vrms / 1,100 Vpeak / 10⁷ VHz


• Noise rejection: 60–120 dB normal mode (FAST/MID/SLOW)


• AC crest factor: 3:1 at full scale Current Measurement


• DC ranges: 20 mA to 10 A


• AC ranges: True RMS capable


• DC accuracy: ±0.2% ±5d (20 mA); ±0.6% ±5d (200 mA)


• Terminal resistance: ≤1.5 Ω (20 mA–2,000 mA); ≤0.04 Ω (10 A)


• Overcurrent protection: 0.5 A/250 V (low ranges); 15 A/250 V (10 A range) Additional Functions


• Resistance, diode test, conductance, dBm measurement, frequency analysis


• AC voltage filter: 300 Hz to 100 kHz


• AC response time: ~4 seconds (typical)


• Resolution: 1 µV to 100 mV (voltage); 1 µA to 1 mA (current)

Key Features

• Dual-channel, dual-display architecture for parallel measurement workflows


• True RMS AC + DC combined measurement capability


• Frequency measurement and dBm analysis


• Field-portable with battery operation option


• Selectable sampling rates for dynamic range optimization


• High input impedance (≥1 GΩ DC) minimizes circuit loading


• Temperature-compensated accuracy (23 ± 5°C, ≤85% RH specification)

Typical Applications

• Component and circuit characterization in R&D


• In-circuit diagnostics and troubleshooting


• Production line acceptance testing


• AC/DC power supply validation


• Frequency and conductance analysis

Compatibility & Integration Dual-channel design supports simultaneous measurement of related parameters, streamlining test sequences in both bench and automated environments.