NI PCI-4065 6½-Digit PCI Digital Multimeter
The NI PCI-4065 is a 6½-digit digital multimeter for automated electrical measurements in conventional PCI desktop computers. It supports AC and DC voltage, AC and DC current, 2-wire and 4-wire resistance, diode testing and temperature measurement through the NI-DMM driver.
With voltage measurements up to ±300 V, current measurements up to ±3 A, resistance measurement up to 100 MΩ and reading rates up to 3,000 S/s at reduced resolution, the PCI-4065 is suitable for production test, component characterization, data logging and maintenance of established PCI-based test systems.
Key Features of the PCI-4065
- 6½-digit digital multimeter for conventional PCI systems
- DC voltage ranges from 100 mV to 300 V
- AC voltage bandwidth from 10 Hz to 100 kHz
- DC and AC current measurement up to 3 A
- 2-wire and 4-wire resistance measurement up to 100 MΩ
- 10 V diode test with selectable 100 µA or 1 mA test current
- Thermocouple, RTD and thermistor measurement support through NI-DMM
- Up to 3,000 readings/s at 4½-digit resolution
- Hardware triggering through the auxiliary I/O connector
- User-replaceable 4 A fast-acting current fuse
- NI-DMM support for LabVIEW, LabWindows/CVI and TestStand applications
- Single-slot PCI form factor
Measurement Performance
The PCI-4065 lets a test program balance accuracy and speed by selecting the appropriate resolution and aperture. At 6½ digits, longer power-line-cycle apertures improve rejection of 50 Hz and 60 Hz interference. At lower resolution, the DMM can operate at up to 3,000 readings/s for faster screening and automated data acquisition.
For low-value resistance measurements, use the 4-wire function to remove the effect of test-lead resistance. The 10 MΩ and 100 MΩ ranges use 2-wire measurement only. The AC voltage function covers 10 Hz to 100 kHz, while the AC current function is specified from 10 Hz to 5 kHz.
PCI-4065 Technical Specifications
| Product Model | PCI-4065 |
|---|---|
| NI Part Number | 779770-01 |
| Product Type | 6½-digit PCI digital multimeter |
| Bus Interface | Conventional PCI |
| Resolution | Up to 6½ digits |
| Maximum Reading Rate | 3,000 S/s at 4½ digits |
| DC Voltage Ranges | 100 mV, 1 V, 10 V, 100 V, 300 V |
| DC Voltage Resolution | 100 nV on 100 mV range; 1 µV on 1 V range; 10 µV on 10 V range |
| DC Current Ranges | 10 mA, 100 mA, 1 A, 3 A |
| AC Voltage Ranges | 200 mV, 2 V, 20 V, 300 V |
| AC Voltage Bandwidth | 10 Hz to 100 kHz |
| AC Current Ranges | 10 mA, 100 mA, 500 mA, 3 A |
| AC Current Bandwidth | 10 Hz to 5 kHz |
| Resistance Ranges | 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ, 100 MΩ |
| Resistance Method | 2-wire and 4-wire; 10 MΩ and 100 MΩ ranges are 2-wire only |
| Diode Test | 10 V range; 100 µA or 1 mA test current |
| Maximum Common-Mode Voltage | 300 V AC RMS or DC |
| Measurement Category | CAT II |
| Current Input Protection | F 4 A H 300 V fast-acting, user-replaceable fuse |
| Trigger Latency | <1 µs |
| Maximum Trigger Rate | 2.5 kHz |
| Warm-Up Time | 30 minutes to rated accuracy |
| Recommended Calibration Interval | 1 year |
| Power Consumption | <3 W from the PCI motherboard |
| Dimensions | 18.3 cm × 2.0 cm × 12.0 cm |
| Weight | 325 g |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -40°C to 70°C |
| Software Driver | NI-DMM |
DC and Resistance Measurement Details
The PCI-4065 offers DC voltage resolution from 100 nV on the 100 mV range to 1 mV on the 300 V range. NI specifies 1-year accuracy for the 10 V range as ±(90 ppm of reading + 12 ppm of range) under its stated calibration and temperature conditions. Use NI’s complete range-specific accuracy tables whenever a measurement uncertainty budget is required.
Resistance measurements range from 100 Ω to 100 MΩ. Four-wire resistance operation is available from 100 Ω through 1 MΩ and is recommended whenever lead resistance or contact resistance could affect the result. For 2-wire resistance measurements, offset nulling helps compensate for residual lead and fixture offsets.
AC and Temperature Measurement Details
AC voltage accuracy depends on frequency, selected range, reading rate, amplitude and waveform crest factor. For the complete 10 Hz to 100 kHz AC voltage bandwidth, NI specifies the 1 S/s, 6½-digit configuration. Faster configurations trade lower-frequency coverage and resolution for throughput.
NI-DMM can calculate temperature from supported J, K, N, T, E, R, S and B thermocouples, as well as RTD and thermistor measurements. Total temperature uncertainty must include sensor tolerance, wiring and reference-junction effects in addition to DMM uncertainty.
PCI-4065 Part Number and Accessories
| Item | Part Number or Type | Description |
|---|---|---|
| PCI-4065 | 779770-01 | NI 6½-digit PCI DMM, 300 V and 3 A |
| P-1 Probe Set | Standard banana-plug probe set | Direct voltage, resistance and diode measurements |
| PCI Screw Kit | Included mounting hardware | Secures the DMM board in the computer chassis |
| AUX I/O Cable | Application dependent | Connects external trigger and measurement-complete signals |
| External Switching Hardware | Application dependent | Expands one DMM into a multipoint measurement system |
NI lists the PCI-4065 device, a PCI screw kit, a P-1 DMM standard probe set and safety, environmental and regulatory documentation with a standard new device. For pre-owned equipment, confirm the exact included accessories before ordering.
PCI Slot and Computer Compatibility
The PCI-4065 must be installed in a compatible conventional PCI slot. It cannot be inserted directly into a PCI Express-only slot. Before selecting this model, check the computer motherboard, available slot type, physical clearance, operating system and required NI-DMM version.
NI-DMM Software Support
The NI-DMM driver configures the measurement function, range, resolution, aperture, triggering and acquisition sequence. It can be used with LabVIEW, LabWindows/CVI, TestStand and other supported development environments. When maintaining a validated legacy test station, keep the proven driver version unless the new computer and application have been tested together.
PCI-4065 Applications
- Automated functional and production testing
- Electronic component characterization
- Power-supply and circuit-board verification
- Resistance and continuity testing
- Multipoint voltage and temperature data logging
- Automated test fixtures with external triggering
- Educational laboratory and research measurements
- Maintenance of conventional PCI test systems
Automated Functional Test
The PCI-4065 provides the core voltage, current, resistance and diode measurements required by many board-level and subsystem tests. NI-DMM allows the test program to standardize ranges, apertures and trigger behavior for repeatable results.
Multipoint Data Logging
When paired with suitable switching hardware, one PCI-4065 can measure many voltage, resistance or temperature points. Account for switch settling time, channel leakage, thermal EMF, fixture resistance and the required scan rate when building a multipoint system.
Low-Resistance and Temperature Measurements
Use the 4-wire resistance function for low-value resistors, contacts and cable-resistance measurements. For temperature test points, use compatible sensors and correct NI-DMM configuration; thermocouple systems also require an appropriate reference-junction method.
PCI-4065 Installation Workflow
Step 1: Verify System Compatibility
Confirm that the computer has a standard PCI slot, adequate card clearance and a supported operating system. Verify NI-DMM compatibility before changing a legacy controller or driver version.
Step 2: Install NI-DMM
Install the required NI-DMM driver and development environment before configuring the hardware. Restart the computer if requested by the installer.
Step 3: Power Down the Computer
Shut down the computer, disconnect mains power and follow normal electrostatic-discharge precautions before handling the PCI-4065.
Step 4: Install the PCI-4065
Insert the board into an available conventional PCI slot, seat it fully and secure the rear bracket. Restore the computer cover before applying power.
Step 5: Verify Device Recognition
Start the computer and confirm that the PCI-4065 appears in NI Measurement & Automation Explorer. If the module is not detected, check PCI seating, BIOS resource allocation and NI-DMM installation.
Step 6: Connect the Measurement Circuit
Select the correct terminals for voltage, current, 2-wire resistance or 4-wire resistance. Use correctly rated leads and verify the selected measurement function before applying a signal.
Step 7: Configure and Validate the Measurement
Select the function, range, resolution, aperture and trigger mode in NI-DMM. Allow 30 minutes of warm-up when rated accuracy is required, then validate the setup with a known source or reference resistor.
Installation Best Practices
- Use only a conventional PCI slot
- Allow 30 minutes of warm-up for rated accuracy
- Use 4-wire connections for low-resistance measurements
- Keep high-voltage and low-level measurement wiring separated
- Document NI-DMM range, aperture and trigger settings in validated programs
- Check the current fuse after an overcurrent event
PCI-4065 Troubleshooting
The PCI-4065 Is Not Detected
Confirm that the board is fully seated in a conventional PCI slot and that NI-DMM is installed. Restart the computer and check NI Measurement & Automation Explorer. A PCIe-only motherboard cannot operate the PCI-4065 directly.
DC Measurements Are Noisy or Unstable
Allow the DMM to warm up, check grounding and shielding, then increase aperture time or power-line cycles as needed. Confirm that the selected range is appropriate and that the test fixture does not introduce ground loops or mains pickup.
Low-Resistance Results Are Higher Than Expected
Use 4-wire resistance measurement whenever possible. If 2-wire measurement is necessary, perform offset nulling and include lead, fixture and contact resistance in the uncertainty calculation.
The Current Function Does Not Work
Verify the current-terminal wiring, selected range and current level. After an overload, inspect the user-replaceable 4 A fast-acting fuse according to the NI service documentation.
AC Measurements Are Inaccurate
Check signal frequency, amplitude and crest factor. AC voltage is specified from 10 Hz to 100 kHz, while AC current is specified from 10 Hz to 5 kHz. Use an NI-DMM reading-rate setting that supports the bandwidth required by the test.
Temperature Results Are Incorrect
Verify the sensor type, lead configuration and NI-DMM temperature setting. For thermocouples, check the reference-junction configuration. For RTDs, confirm a suitable 4-wire connection and include sensor tolerance in the total error.
External Triggering Does Not Start the Measurement
Check the AUX I/O cable, trigger source, selected edge and logic level. Verify that the external digital signal is TTL-compatible and remains within the permitted voltage range relative to chassis ground.
PCI-4065 Comparison
| Model | Platform | Primary Difference | Best Suited For |
|---|---|---|---|
| PCI-4065 | Conventional PCI | 6½ digits, ±300 V, ±3 A, up to 3 kS/s | Existing PCI-based desktop test systems |
| PCIe-4065 | PCI Express | 4065 measurement capability on PCIe | Desktop computers with PCIe expansion |
| PXI-4065 | PXI | 4065-family DMM for modular PXI systems | PXI systems using chassis-based instrumentation |
| PCI-4072 | Conventional PCI | Higher-performance FlexDMM architecture | Applications requiring greater precision or advanced DMM capability |
PCI-4065 vs PCIe-4065
The key difference is the computer interface. The PCI-4065 requires a conventional PCI slot, while the PCIe-4065 uses PCI Express. Choose the model that matches the installed motherboard; the two card types are not mechanically interchangeable.
PCI-4065 vs PXI-4065
The PXI-4065 installs in a PXI chassis and is suited to modular test platforms that combine DMM, switching, source and acquisition hardware. The PCI-4065 installs directly in a desktop computer and is appropriate when a conventional PCI system is already in place.
PCI-4065 vs PCI-4072
The PCI-4065 is a general 6½-digit DMM for common automated measurements. The PCI-4072 FlexDMM is a higher-performance option for systems that need greater precision or advanced measurement capability. Select according to the required uncertainty, test time and existing computer platform.
Selecting the Right Computer-Based DMM
Choose the PCI-4065 for a conventional PCI system that needs voltage, current, resistance, diode and temperature measurements. Choose the PCIe-4065 for PCIe desktop computers. Consider a PXI DMM when the system requires a modular chassis and coordinated PXI switching or instrumentation.
Recommended Related Products
- PCIe-4065 6½-Digit PCI Express Digital Multimeter for PCIe-based systems
- PXI-4065 6½-Digit PXI Digital Multimeter for PXI test platforms
- NI PCI and USB Measurement Devices for additional computer-based instrumentation
- External switching hardware for multipoint voltage, resistance and temperature measurements
- Compatible DMM probes, 4-wire leads and AUX I/O trigger cables
Why Choose the PCI-4065?
- Direct integration with conventional PCI computers
- 6½-digit resolution for precision electrical measurements
- ±300 V voltage and ±3 A current measurement capability
- 4-wire resistance measurement for low-resistance accuracy
- Selectable speed and power-line noise rejection
- External trigger support through AUX I/O
- NI-DMM compatibility for established automated test applications
- Suitable replacement option for legacy PCI test stations
Frequently Asked Questions
What is the PCI-4065?
The PCI-4065 is an NI 6½-digit digital multimeter that installs in a conventional PCI slot. It measures AC/DC voltage, AC/DC current, resistance, diode voltage and supported temperature sensors.
What is the PCI-4065 part number?
The standard NI part number is 779770-01. Confirm the full model and part number when sourcing a replacement for a legacy system.
What voltage and current can the PCI-4065 measure?
It measures DC voltage up to ±300 V, AC voltage up to 300 V RMS and DC or AC current up to 3 A. The instrument is rated for Measurement Category II applications only.
What is the maximum measurement speed?
The maximum reading rate is 3,000 S/s at 4½-digit resolution. At 6½ digits, the reading rate is lower and depends on the selected aperture and power-line frequency.
Does the PCI-4065 support 4-wire resistance measurement?
Yes. It supports 4-wire resistance measurement from 100 Ω through 1 MΩ. The 10 MΩ and 100 MΩ ranges are 2-wire only.
Can the PCI-4065 be installed in a PCI Express slot?
No. The PCI-4065 requires a conventional PCI slot. For a PCI Express computer, select the PCIe-4065 after verifying driver and operating-system compatibility.
Which software driver controls the PCI-4065?
The PCI-4065 uses NI-DMM. The driver configures measurement functions, ranges, resolution, aperture, triggering and data acquisition sequences.
Does the PCI-4065 measure temperature?
Yes. NI-DMM supports temperature calculations for compatible thermocouples, RTDs and thermistors. A suitable sensor configuration is required, and total accuracy must include the sensor and reference-junction uncertainty.
What should be checked when the current function fails?
Check lead placement, selected range and the user-replaceable 4 A fast-acting fuse. The fuse can open after an overcurrent event while other measurement functions continue to operate.
Is a warm-up period required?
Yes. Allow 30 minutes of warm-up before measurements requiring rated accuracy. NI recommends a one-year calibration interval.
Request a Quote for the PCI-4065
Contact PXISOURCE for current availability, condition, lead time and project pricing for the NI PCI-4065 6½-Digit PCI Digital Multimeter. Please send the required quantity, destination country and requirements for probes, trigger cables, accessories or calibration documentation to sales@pxisource.com or WhatsApp.
