SDM4055A — 5½-digit Dual-display Digital Multimeter
SIGLENT SDM4055A and SDM4055A-SC are 5½-digit, 220,000-count bench digital multimeters for precision lab measurement, production test and multi-point logging. The platform supports dual-display views, True-RMS AC voltage/current, SCPI remote control, USB/LAN connectivity, 2M reading cache and an SDM4055A-SC scanner-card variant.
| Model | Digits / Count | DCV Accuracy | DCV Range | ACV Range | Current Range | Scanner Card |
|---|---|---|---|---|---|---|
| SDM4055A | 5½ · 220,000 counts | 0.015% | 200 mV to 1000 V | 200 mV to 750 V | 20 mA to 10 A | No |
| SDM4055A-SC | 5½ · 220,000 counts | 0.015% | 200 mV to 1000 V | 200 mV to 750 V | 20 mA to 10 A | Yes · included on SC model |
Key Features
5½-digit · 220,000-count Resolution
5½-digit resolution with 220,000 counts gives better separation of small voltage, current and resistance changes than basic bench meters, while remaining cost-effective for education, service and production benches.
0.015% Basic DC Voltage Accuracy
0.015% DC voltage accuracy supports component verification, voltage-reference checks, power-supply adjustment and incoming inspection where handheld-meter accuracy is not enough.
5 to 4.8k Readings/s
Selectable reading speed from 5 readings/s to 4.8k readings/s allows stable high-resolution measurement or faster production screening depending on the test requirement.
SDM4055A-SC Scanner-card Variant
The SDM4055A-SC includes a scanner card for multi-point measurements. It provides 12 multi-purpose channels plus 4 current channels for burn-in, production test and multi-node validation.
True-RMS AC Voltage and Current
True-RMS AC voltage/current measurement improves accuracy for non-sinusoidal waveforms, power electronics, transformer outputs, audio signals and production electrical checks.
USB, LAN and SCPI Remote Control
USB Device, USB Host and LAN interfaces support remote operation, logging and integration with LabVIEW, MATLAB, Python and general ATE systems through standard SCPI commands.
5-inch True-colour Display
The 5-inch TFT display supports numerical display, trend chart, bar meter, histogram, data log and statistics views for faster bench interpretation without exporting data first.
Internal Data Storage
512 MB RAM supports up to 2M readings for caching, and 256 MB NAND flash stores readings, screen images and configuration files for traceable measurement workflows.
Specifications
| Parameter | Unit | Value / Description |
|---|---|---|
| MEASUREMENT CORE | ||
| Reading resolution | digits / counts | 5½ digits · 220,000 counts |
| Reading rate | rdgs/s | 5 to 4,800 |
| DC voltage accuracy | — | 0.015% basic |
| VOLTAGE / CURRENT | ||
| DC voltage range | V | 200 mV to 1000 V |
| AC voltage range | V | 200 mV to 750 V · True-RMS |
| DC current range | A | 20 mA to 10 A |
| AC current | — | True-RMS AC current measurement |
| High-current mode | — | Automatic switching between 10 A high-current and 3 A low-current modes · up to 30 A with external shunt |
| SCANNER MODEL | ||
| SDM4055A-SC scanner | channels | 12 multi-purpose channels + 4 current channels |
| Scanner functions | — | DCV · ACV · DCI · ACI · 2WR · 4WR · CAP · FREQ · Diode · Continuity · Temperature |
| Scanner note | — | Included only on new SDM4055A-SC instruments; not field-added later |
| DISPLAY / MEMORY / INTERFACE | ||
| Display | — | 5-inch true-colour TFT-LCD |
| RAM cache | readings | Up to 2M readings |
| Internal flash | — | 256 MB NAND flash for readings, images and configuration files |
| Remote control | — | SCPI · EasyDMM-X PC control |
| Interfaces | — | USB Device · USB Host · LAN · optional USB-GPIB adapter |
Applications
Automated Electrical Test
SCPI, LAN and USB connectivity make SDM4055A suitable for automated production voltage, resistance, current and continuity checks.
Multi-point Measurement
The SDM4055A-SC scanner version supports multi-point measurement for burn-in racks, ageing tests, environmental chambers and production fixtures.
Bench Design Validation
Dual-display, trend chart and data logging support circuit validation, drift monitoring, power-rail checks and component characterisation.
Incoming Inspection
5½-digit measurement accuracy supports incoming QC of resistors, sensors, harnesses, boards, connectors and power modules.
RTD and Thermocouple Logging
The scanner version supports temperature measurement workflows using RTD and thermocouple inputs for multi-point thermal checks.
Advanced Measurement Lab
SDM4055A gives students a practical bench DMM platform with dual display, logging, statistics, SCPI and PC-connected workflows.
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