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The NI 4070 is a 6½ digit DMM for the PXI and PCI buses. The NI 4070 can acquire waveforms at 1.8 MS/s. For more information about the NI 4070 specifications, refer to Related Documentation for the NI 4070 specifications document.
This topic contains the following subsections:
The front of the NI 4070 module has five connectors—four banana plug connectors and one 9-pin mini–circular DIN connector. The four banana plug connectors are high-voltage, safety-agency approved signal connectors. The 9-pin DIN connector labeled AUX I/O is a digital signal connector, which carries triggers and SCXI communication signals. For an illustration of the front panel connectors and wiring instructions, refer to NI 4070 Front Panel Connections.
The input connectors on the NI 4070 are gold-plated, low-thermal copper for best low-voltage performance. The insulator material is a Lexan compound, optimized for low leakage over the full environmental operating range.
For use with the NI 4070, NI recommends selecting a cable with characteristics similar to the Belden 83317E; refer to the Belden CDT Incorporated Web site at www.belden.com for information about this cable.
Tape-wrapped polytetrafluoroethylene (PTFE) insulation guarantees low leakage. Copper conductors with silver plating perform very well for low-voltage measurements because of their low thermal characteristics. Use a cable with at least 90% shielding effectiveness.
|Belden #83317E Teflon Insulated Cable|
|Type of Insulator||AWG||Conductor Material||Resistance per Foot||Capacitance per Foot|
|TFE||26||Silver-plated copper, stranded||39 mΩ||35.5 pF|
The NI 4070 can operate as a DMM and can acquire waveforms up to 1.8 MS/s. The following table lists the functions and ranges supported by the NI 4070 while in DMM mode:
|DC Voltage||100 mV, 1 V, 10 V, 100 V, 300 V|
|AC Voltage||50 mV, 500 mV, 5 V, 50 V, 300 V|
|DC Current*||20 mA, 200 mA, 1 A|
|AC Current*||10 mA, 100 mA, 1 A|
|2-Wire Resistance||100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ, 100 MΩ|
|4-Wire Resistance||100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ|
|Diode||10 V at 1 µA / 10µA / 100µA; 4.5 V at 1 mA|
|Frequency/Period**||1 Hz - 500 kHz / 2 µs - 1 s|
|* To measure current outside of the normal range on the NI 4070, you must use a current shunt module (CSM). Refer to Measuring Current for more information.
** Frequency/Period voltage ranges are the same as AC voltage ranges.
The following table lists the functions and ranges supported for waveform acquisitions:
|Voltage Waveform||100 mV, 1 V, 10 V, 100 V, 300 V||AC or DC|
|Current Waveform*||20 mA, 200 mA, 1 A||DC|
|* To measure current outside of the normal range on the NI 4070, you must use a current shunt module (CSM). Refer to Measuring Current for more information.|
The following table lists the available NI 4070 input resistance selections. NI calibrates the NI 4070 for full accuracy with all input resistances shown.
|Note The default input resistance for each range is italicized.|
|Range||Input Resistance||Range||Input Resistance||Range||Input Resistance|
|100 mV||10 MΩ or 10 GΩ||50 mV||1 MΩ||100 mV||10 GΩ or 1 MΩ|
|1 V||10 MΩ or 10 GΩ||500 mV||1 MΩ||1 V||10 GΩ or 1 MΩ|
|10 V||10 MΩ or 10 GΩ||5 V||1 MΩ||10 V||10 GΩ or 1 MΩ|
|100 V||10 MΩ||50 V||1 MΩ||100 V||1 MΩ|
|300 V||10 MΩ||300 V||1 MΩ||300 V||1 MΩ|
The NI 4070 is equipped with a F 1.25 A 250 V Fast–Acting fuse designed to help protect the DMM and your test system. For instructions on replacing the fuse, refer to Related Documentation for the NI Digital Multimeters Getting Started Guide.
Calibration maximizes the accuracy of a DMM. To ensure accuracy, you must perform calibration. NI recommends that you externally calibrate every two years. Refer to self-calibration or ADC calibration to internally calibrate the NI 4070. Refer to the NI 4070/4072 6½ Digit FlexDMM Calibration Procedure at the NI Calibration Solutions Web site for information on externally calibrating the NI PXI/PCI-4070/4072. For information on calibrating the NI 4070 using National Instruments Calibration Executive, refer to the NI Calibration Solutions Web site. All NI measurement devices receive NIST-traceable calibration before shipping.