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Home Support Documentation Supplemental

NI PXIe-4081 - DMM/Switch Handshaking Scan Rates

Updated Dec 13, 2023

Overview

Benchmarking scan rate data is very useful when deciding what which devices are needed to meet system requirements. This is true of digital multimeter (DMM) and switch systems since scan rates are dependent on the speed of the digital multimeter, the switch, and the triggers between them. This document contains data for the typical scan rates that can be achieved utilizing handshaking.

Contents

Benchmarking Procedure


There are many factors which will affect the overall scanning speed of a DMM/switch system. The major factors include the type of the measurement, the range of the measurement, and resolution of the measurement. The effect of these and other factors related to the DMM can be better understood by considering the digital multimeter measurement cycle. In addition to these factors, relay operate times, DMM settling times, and switch settling times limit the overall speed of the system. The following benchmarks provide a good starting point to see typical scan rates for common use cases.

The benchmarking application that was used to gather the following data is attached to this document. It was created using LabVIEW 2017, NI-SWITCH 17.0 and NI DMM 17.0. It can be configured to use your desired hardware, configurations, and measurement type and run to display the DMM+Switch Handshaking Scan Rate.

 

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Scan Rate Benchmarks

 

DC Voltage

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4081 set to measure DC Voltage. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate. 

 

NI PXIe-4081 DC Voltage
Switch ModuleDMM/Switch Scan Rate (cycles/second)
RangeDigits of Resolution
≤ 4.55.56.57.5
NI PXI-2501≤ 10V8826213.40.8
100V4683823.40.8
1000V4683823.40.8
NI PXI-2503≤ 10V102973.40.8
100V93893.40.8
1000V93893.40.8
NI PXI-2527≤ 10V104993.40.8
100V94903.40.8
1000V94903.40.8
NI PXI-2529≤ 10V92883.40.8
100V85813.40.8
1000V84813.40.8
NI PXI-2530≤ 10V6286283.40.8
100V4713773.40.8
1000V4713773.40.8
NI PXI-2532B≤ 10V6134733.40.8
100V3803213.40.8
1000V3803213.40.8
NI PXI-2535≤ 10V9256393.40.8
100V4793903.40.8
1000V4803893.40.8
NI PXI-2575≤ 10V1141083.40.8
100V102973.40.8
1000V102973.40.8
PXIe-2531≤ 10V6665053.40.8
100V4003353.40.8
1000V4003353.40.8
PXI-2534≤ 10V2882533.40.8
100V2232023.40.8
1000V2232023.40.8
PXI-2584≤ 10V3673113.40.8
100V2682383.40.8
1000V2682383.40.8

 

DC Current

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4081 set to measure DC Current. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate. 

 

NI PXI-4081 DC Current
DMM/Switch Scan Rate (cycles/second)
Switch ModuleResolution
≤4.55.56.5
NI PXI-2501434014043.4
NI PXI-25031131073.4
NI PXI-25271151093.4
NI PXI-2529101963.4
NI PXI-253018859423.4
NI PXI-2532B13698263.4
NI PXI-2535551515093.4
NI PXI-25751271193.4
PXIe-253116709263.4
PXI-25343893283.4
PXI-25845484343.4

 

2-Wire Resistance

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4081 set to measure 2-Wire Resistance. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate. 

 

NI PXIe-4081 2-Wire Resistance
Switch ModuleDMM/Switch Scan Rate (cycles/second)
RangeDigits of Resolution
≤ 4.55.56.57.5
NI PXI-2501≤ 1kΩ8846203.40.8
10kΩ1951783.40.8
100kΩ40393.20.8
1MΩ10102.60.6
≥ 10MΩ4.03.81.80.4
NI PXI-2503≤ 1kΩ102973.40.8
10kΩ72703.20.8
100kΩ29293.00.8
1MΩ992.40.6
≥ 10MΩ3.83.81.80.4
NI PXI-2527≤ 1kΩ104993.40.8
10kΩ73713.40.8
100kΩ30293.00.8
1MΩ992.40.6
≥ 10MΩ3.83.81.80.4
NI PXI-2529≤ 1kΩ92883.40.8
10kΩ67653.20.8
100kΩ29283.00.8
1MΩ992.40.6
≥ 10MΩ3.83.81.80.4
NI PXI-2530≤ 1kΩ6286283.40.8
10kΩ1881713.40.8
100kΩ39383.20.8
1MΩ10102.60.6
≥ 10MΩ4.03.81.80.4
NI PXI-2532B≤ 1kΩ6134733.40.8
10kΩ1771633.40.8
100kΩ39383.20.8
1MΩ10102.60.6
≥ 10MΩ4.03.81.80.4
NI PXI-2535≤ 1kΩ9236393.40.8
10kΩ1971793.40.8
100kΩ40393.20.8
1MΩ10102.60.6
≥ 10MΩ4.03.81.80.4
NI PXI-2575≤ 1kΩ1141083.40.8
10kΩ78753.40.8
100kΩ30303.20.8
1MΩ992.40.6
≥ 10MΩ3.83.81.80.4
PXIe-2531≤ 1kΩ6665043.40.8
10kΩ1821673.40.8
100kΩ39383.20.8
1MΩ10102.60.6
≥ 10MΩ4.03.81.80.4
PXI-2534≤ 1kΩ2882533.40.8
10kΩ1341253.40.8
100kΩ36363.20.8
1MΩ10102.60.6
≥ 10MΩ3.83.81.80.4
PXI-2584≤ 1kΩ3673113.40.8
10kΩ1481393.40.8
100kΩ37373.20.8
1MΩ10102.60.6
≥ 10MΩ3.83.81.80.4

 

4-Wire Resistance

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4081 set to measure 4-Wire Resistance. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate. 

 

NI PXIe-4081 4 Wire Resistance
Switch ModuleDMM/Switch Scan Rate (cycles/second)
RangeDigits of Resolution
≤ 4.55.56.57.5
NI PXI-2501≤ 1kΩ8836193.40.8
10kΩ1951783.40.8
100kΩ40393.20.8
1MΩ10102.60.6
10MΩ4.04.01.80.4
NI PXI-2503≤ 1kΩ102973.40.8
10kΩ72703.40.8
100kΩ29293.00.8
1MΩ992.40.6
10MΩ3.83.81.80.4
NI PXI-2527≤ 1kΩ104993.40.8
10kΩ73713.40.8
100kΩ30293.20.8
1MΩ992.40.6
10MΩ441.80.4
NI PXI-2529≤ 1kΩ92883.40.8
10kΩ67653.40.8
100kΩ29283.00.8
1MΩ992.40.6
≥ 10MΩ3.83.81.80.4
NI PXI-2530≤ 1kΩ6286283.40.8
10kΩ1881713.40.8
100kΩ39383.20.8
1MΩ10102.60.6
10MΩ4.03.81.80.4
NI PXI-2532B≤ 1kΩ6134733.40.8
10kΩ1771633.40.8
100kΩ39383.20.8
1MΩ10102.60.6
10MΩ4.03.81.80.4
NI PXI-2535≤ 1kΩ9236393.40.8
10kΩ1961793.40.8
100kΩ40393.20.8
1MΩ10102.60.6
10MΩ4.04.01.80.4
NI PXI-2575≤ 1kΩ1141083.40.8
10kΩ78753.40.8
100kΩ30303.20.8
1MΩ992.40.6
10MΩ3.83.81.80.4
PXIe-2531≤ 1kΩ6665053.40.8
10kΩ1821673.40.8
100kΩ39383.20.8
1MΩ10102.60.6
≥ 10MΩ4.03.81.80.4
PXI-2534≤ 1kΩ2882533.40.8
10kΩ1341253.40.8
100kΩ36363.20.8
1MΩ10102.60.6
≥ 10MΩ3.83.81.80.4
PXI-2584≤ 1kΩ3673123.40.8
10kΩ1481393.40.8
100kΩ37363.20.8
1MΩ10102.60.6
≥ 10MΩ3.83.81.80.4

 

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Optimizing System Scan Rate

There are ways to increase the speed of the system by adjusting the reading rate of a DMM. Depending on the requirements of the measurement, reducing parameters such as aperture time and turning off settings such as AutoZero will increase the overall scan rate of the system but may reduce measurement precision. These values can be experimented with to find a good balance between precision and speed for the measurement system. These benchmarks use default settings for switch and DMM configurations, however to ensure specified accuracy, extra settling time may be required.

 

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