Siglent SDM4065A 6.5 Digits 50000 rdgs/s Digital Multimeter
The SIGLENT SDM4065A is a 6½‑digit (2,200,000‑count) dual‑display digital multimeter featuring a 5" full‑color touchscreen (800×480) and real‑time True‑RMS measurement for AC/DC voltage (200 mV–1000 V) and current (200 µA–10 A). With up to 50 000 rdgs/s throughput and 0.001 PLC minimum aperture, it delivers both high‑speed and high‑precision performance.
SDM4065A — 6½ digit touchscreen multimeter
The SDM4065A is the flagship of the touchscreen family: 6½ digits and 2,200,000 counts of resolution at reading rates up to 50,000 per second — a precision multimeter with a digitizer's reflexes, autozero, and a 2-million-reading memory behind a 5-inch multi-touch display.
The numbers behind the flagship badge: 2,200,000 counts of resolution, autozero to cancel offset drift, and a digitize mode that samples at up to 50,000 readings per second into a 2,000,000-reading memory. The function set covers DC/AC voltage to 1000 V (True-RMS), current to 10 A, 2/4-wire resistance, capacitance, frequency and TC/RTD temperature, with statistics, histogram, trend and limit testing on the 5-inch display and full SCPI automation over USB and LAN.
Key features
- Real 6½ digit (2,200,000 count) resolution for fine detail
- 35 ppm basic DCV accuracy · True-RMS AC with a low noise floor
- DC/AC voltage to 1000 V · current to 10 A · 2/4-wire resistance, capacitance, frequency, diode, continuity
- Temperature via RTD, thermocouple and user-defined sensors, with cold-junction compensation
- Reading modes Slow / Medium / Fast — up to 50,000 rdgs/s
- Digitize mode with autozero — waveform-like capture at up to 50,000 rdgs/s
- Built-in data logger: 2 million readings to memory, up to 360 million to file
- Math & statistics: Min, Max, Avg, Std Dev, dBm, dB, limit testing · 4 trigger modes
- SCPI remote control over LAN, USB, VNC and web server · optional GPIB · EasyDMM-X software
Application examples
Precision R&D and metrology
With 6½ digits, 35 ppm basic DCV accuracy and autozero, the SDM4065A serves as a practical transfer standard: comparing references, verifying source drift and confirming calibration results reproduce on your own bench.
Transient and inrush analysis
The digitize mode captures at up to 50,000 readings per second into deep memory — inrush current profiles, regulator soft-start ramps and relay bounce appear as waveform-like records that averaging meters cannot show.
Repair and calibration
Wide ranges, dual display and audio-feedback continuity make daily service work fast, while the resolution reaches milliohm contact resistances and microvolt offsets when precision is the question.
Battery and power-supply analysis
Voltage drift, current draw and ripple measured with 6½-digit confidence — trend and histogram views expose slow changes and distributions without extra software.
Built around the touchscreen
Four views on a 5″ multi-touch display
Numerical, bar meter, trend chart and histogram — switch with a tap. True-RMS AC, 2/4-wire resistance, capacitance, frequency and TC/RTD temperature are all built in.
Digitize: 50,000 readings per second
The digitize mode samples at up to 50,000 rdgs/s into a 2-million-reading memory — fast enough to capture inrush currents, power-up transients and slow ripple that a normal DMM reading averages away, with autozero keeping the precision honest.
Who it’s for & why
The SDM4065A is for measurements where both the digits and the dynamics matter. Its 6½-digit resolution serves calibration checks, reference comparisons and four-wire milliohm work — while the 50,000 rdgs/s digitize mode captures what ordinary DMMs cannot see at all: inrush current profiles, power-up transients, relay bounce, slow ripple under load. One instrument covers the precision bench and the transient investigation, which is why it anchors R&D and validation setups.
- Precision R&D measurements
- Calibration & verification work
- Transient and inrush investigation
- Demanding automated characterisation
- Low-level DCV/DCI (µV / nA region)
- Digitized capture of inrush & power-up events
- 4-wire precision resistance
- High-speed logged acquisition to 2M readings
Specifications
| Resolution | 6½ digit · 2,200,000 counts |
| Max. reading rate | up to 50,000 rdgs/s |
| Digitize / autozero | High-speed sampling mode · 2,000,000-reading memory · autozero |
| Display | 5" capacitive multi-touch · numerical, bar-meter, trend & histogram views |
| Measurement functions | DCV/ACV (True-RMS) · DCI/ACI · 2/4-wire resistance · capacitance · frequency/period · continuity · diode · temperature (TC/RTD) |
| Analysis | Statistics · limit testing · histogram · trend · dB/dBm · probe hold |
| Data logging | Time-stamped logging to internal memory / USB · EasyDMM export |
| Connectivity | USB Device · USB Host · LAN · SCPI remote control |
| PC software | EasyDMM — configuration, logging & export |
From the official SDM4065A datasheet; subject to change, errors & omissions excepted.
In the box
Everything included as standard with your SDM4065A.
Accessories & related
Need multi-point scanning? The SDM4065A-SC adds the factory-installed 16-channel SC1016 scanner card for €1,118.00.
Spare pair of 1000 V CAT III multimeter test leads.
Add GPIB (IEEE-488) control for ATE integration.
The same meter with the SC1016 16-channel scanner card factory-installed — scanning is not a field upgrade, so choose -SC if you may ever need it.
Compare the full SDM4000A range
5½ or 6½ digits, with or without the 16-channel scanner — see the series side by side, or ask us for advice.