II. Model Interpretation

PXI: 3U PXI standard bus, single slot, compatible with PXI/PXIe mixed chassis.

4070: The serial number of the NI FlexDMM series, representing a 6½-digit, 300V, 1.8MS/s digital instrument.

Full name: PXI-4070 6½-digit FlexDMM (with isolated digital instrument).

Positioning: A combination of precise DMM and high-speed acquisition card, replacing the traditional "DMM + oscilloscope" configuration, saving slots and costs.

III. Technical Parameters (25℃ ± 1℃, calibration cycle 2 years, preheating 1 hour)

(1) DMM Mode Measurement Function

DC Voltage (DCV)

Range: 100 mV / 1 V / 10 V / 100 V / 300 V

2-year accuracy: 25 ppm reading + 5 ppm (10V range)

Temperature coefficient: 0.5 ppm/℃ + 0.1 μV/℃

AC Voltage (True RMS ACV)

Range: 50 mV / 500 mV / 5 V / 50 V / 300 V

Bandwidth: 10 Hz～100 kHz

Accuracy: 0.02% reading + 50 μV (5V range, 1kHz)

DC Current (DCI)

Range: 20 mA / 200 mA / 1 A

Accuracy: 0.05% reading + 50 nA (200 mA range)

AC Current (True RMS ACI)

Range: 20 mA / 200 mA / 1 A

Bandwidth: 10 Hz～100 kHz

Accuracy: 0.1% reading + 500 nA (200 mA range, 1kHz)

Resistance (Ω)

Mode: 2-wire / 4-wire

Range: 10 Ω～100 MΩ (2-wire); 10 Ω～1 MΩ (4-wire)

Accuracy: 0.02% reading + 10 mΩ (1 kΩ range, 4-wire)

Frequency / Period: 10 Hz～100 kHz, accuracy 0.01%

Diode Testing: 3.5 V@1 mA

Resolution: 6½-digit (maximum 23 bit), software can be reduced to 5½/4½-digit

Reading Rate: DMM mode maximum 100 times/second (6½-digit); 3½-digit up to 3,000 times/second

(2) Digital Instrument Mode (Core Advantages)

Sampling Rate: Maximum 1.8 MS/s (single channel)

Resolution: 10～23 bit adjustable (adapted dynamically to sampling rate)

Input Range: ±10 V / ±100 V / ±300 V (isolated)

Bandwidth: DC～500 kHz

Isolation Voltage: 300 Vrms (channel - ground isolation)

Trigger: Edge / Window / Pulse Width / Digital Trigger, delay as low as 2 μs

(3) Electrical and Physical Characteristics

Power Supply: PXI backplane + 5 V; typical 400 mA, maximum 500 mA

Connectors: Front-end 4 safety banana sockets (VΩ, I, LO, ground) + 1 9-pin DIN trigger / auxiliary I/O port NI

Size: 3U PXI single slot, 10 mm × 160 mm × 216 mm

Weight: Approximately 0.57 kg NI

Safety Level: IEC 61010-1, UL 61010-1, CSA 61010-1 (CAT II)

(4) Environmental Parameters Operating temperature: 0 ℃ to 40 ℃ (accuracy guaranteed within 15 ℃ to 35 ℃) NI

Storage temperature: -40 ℃ to 70 ℃ NI

Humidity: 10% to 90% (operation), 5% to 95% (storage), no condensation

Preheating time: 1 hour (ensuring 6½ digit accuracy) NI

Calibration period: 2 years (NIST traceable) NI

IV. Interface and Communication Configuration

(1) Front-end I/O Interface

4 × Safety banana sockets (gold-plated low-thermal-electric-copper material, low-leakage insulation) NI

VΩ: Voltage / Resistance positive terminal

I: Current positive terminal (built-in 1.5 A fast fuse)

LO: Common negative terminal

Ground: Shielded ground (isolated from the digital instrument ground)

9-pin DIN interface (AUX I/O): Trigger input/output, PXI Trigger synchronization, SCXI communication NI

(2) Bus and Software Communication

Bus interface: Standard PXI bus, compatible with PXI/PXIe mixed slots

Driver: NI-DMM (IVI compliant) + NI-Digitizer

Software support: LabVIEW, TestStand, LabWindows/CVI, Python, C/C++, .NET

Configuration tool: NI MAX (hardware identification, self-calibration, trigger configuration, channel testing)

Trigger function: PXI Trigger, PFI, software trigger; multi-module synchronization, delay ≤ 2 μs

Calibration: Internal self-calibration (real-time compensation for temperature drift) + external calibration (2-year cycle)

VII. Core Functions

6½-digit high-precision DMM: DC voltage accuracy up to ppm level, suitable for precise power supplies, sensors, semiconductor device testing.

1.8 MS/s isolation digitalizer: High-speed waveform capture, measurement of transient voltage/current, power ripple, switching noise, replacing independent oscilloscope NI.

300 V isolation measurement: Channel - ground isolation 300 Vrms, safe measurement of high-voltage floating ground signals, protecting system and personnel NI.

Flexible resolution (10 to 23 bits): Sampling rate and resolution dynamically balanced,兼顾 high speed and high precision.

True RMS AC measurement： Precise measurement of non-sinusoidal waveforms (variable frequency converter， switch power supply output)， no average value error.

4-wire resistance measurement： Eliminate lead resistance， suitable for ** low-resistance precise resistors， RTD (platinum resistors)** measurement.

Multi-instrument integration： DMM + digitalizer， single slot replacement of "multimeter + oscilloscope + data acquisition card"， simplifying system， reducing cost NI.

Built-in self-calibration： Real-time compensation for temperature drift and long-term drift， maintaining accuracy in the full temperature range (0 to 55 ℃).

VI. Application Scenarios

Power module testing： High-precision DC/AC parameters + waveform capture of ripple / transient， suitable for switching power supplies， lithium battery management systems.

Semiconductor device testing： Static parameters of diodes， MOSFETs， IGBTs + dynamic switching waveform measurement.

Precise sensor calibration： High-precision resistance / voltage measurement of RTD， thermocouple， pressure sensor + dynamic response waveform acquisition.

Automated test system (ATE)： Batch precise testing of PCB， medical equipment， communication modules， balancing static parameters and dynamic waveforms.

Laboratory research and verification： Precise circuit debugging， power stability analysis， transient signal capture， device characteristic characterization.

Industrial equipment maintenance： On-site precise measurement of high-voltage equipment， motors， frequency converters + waveform diagnosis.

VII. Usage and Maintenance Instructions

(1) Installation and Power On Before installation, turn off the power supply. Insert the PXI chassis into a single slot and tighten the screws on the panel.

After powering on, let it preheat for 1 hour to ensure 6½-digit accuracy (reducing temperature drift) from NI.

In NI MAX, confirm that the equipment is normal and there are no errors, and complete the driver installation and self-check.

(II) Wiring and Operation

High-voltage safety: When measuring ≥ 100 V, use a safety banana plug to avoid electric shock; do not exceed 300 V input.

4-wire resistance connection: Connect I+ and I‑ (current wires) and V+ and V‑ (voltage wires) separately to eliminate lead errors.

Digital instrument mode: When measuring high-voltage floating ground signals, use isolated ground (LO / ground) to avoid common ground interference.

Fuse replacement: When the current range is overloaded, replace the 1.5 A fast fuse after power off.

(III) Maintenance and Calibration

Regular calibration: Calibrate once every 2 years using a NIST traceable standard source; internal self-calibration can compensate for temperature drift in real time.

Cleaning and maintenance: Use a dry cloth or soft brush to remove dust, keep the interface dry, and cover with a dust cap when not in use for a long time.

Environmental control: Working temperature is 0 ℃ to 40 ℃; avoid high temperature and high humidity to extend module lifespan.

Avoid overload: Do not exceed the range (such as input > 300 V in the 300 V range) to prevent internal circuit damage.