NI PXIe-4080 - DMM/Switch Handshaking Scan Rates

Aperçu

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.

 

Scan Rate Benchmarks

 

 

DC Voltage

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4080 set to measure DC Voltage. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate

 

NI PXI-4080 DC Voltage
Switch Module DMM/Switch Scan Rate (cycles/second)
Range Digits of Resolution
≤ 4.5 5.5 6.5
NI PXI-2501 ≤ 10V 884 619 3.4
≥ 100V 469 382 3.4
NI PXI-2503 ≤ 10V 102 97 3.4
≥ 100V 93 89 3.4
NI PXI-2527 ≤ 10V 104 99 3.4
≥ 100V 94 90 3.4
NI PXI-2529 ≤ 10V 92 88 3.4
≥ 100V 84 81 3.4
NI PXI-2530 ≤ 10V 628 628 3.4
≥ 100V 471 377 3.4
NI PXI-2532B ≤ 10V 613 473 3.4
≥ 100V 380 321 3.4
NI PXI-2535 ≤ 10V 923 639 3.4
≥ 100V 480 389 3.4
NI PXI-2575 ≤ 10V 114 108 3.4
≥ 100V 102 97 3.4
PXIe-2531 ≤ 10V 666 505 3.4
≥ 100V 400 335 3.4
PXI-2534 ≤ 10V 288 253 3.4
≥ 100V 223 202 3.4
PXI-2584 ≤ 10V 367 312 3.4
100V 268 237 3.4

 

DC Current

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4080 set to measure DC Current. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate. 

 

NI PXI-4080 DC Current
DMM/Switch Scan Rate (cycles/second)
Switch Module Resolution
≤4.5 5.5 6.5
NI PXI-2501 4330 1407 3.4
NI PXI-2503 112 107 3.4
NI PXI-2527 114 109 3.4
NI PXI-2529 101 96 3.4
NI PXI-2530 1885 942 3.4
NI PXI-2532B 1369 826 3.4
NI PXI-2535 5514 1509 3.4
NI PXI-2575 127 119 3.4
PXIe-2531 1669 926 3.4
PXI-2534 389 328 3.4
PXI-2584 548 434 3.4

 

2-Wire Resistance

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4080 set to measure 2-Wire Resistance. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate

 

NI PXI-4080 2-Wire Resistance
Switch Module DMM/Switch Scan Rate (cycles/second)
Range Digits of Resolution
≤ 4.5 5.5 6.5
NI PXI-2501 ≤ 1kΩ 882 619 3.4
10kΩ 194 178 3.4
100kΩ 40 39 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
NI PXI-2503 ≤ 1kΩ 102 97 3.4
10kΩ 72 70 3.2
100kΩ 29 29 3.0
1MΩ 9 9 2.4
≥ 10MΩ 3.8 3.8 1.8
NI PXI-2527 ≤ 1kΩ 104 99 3.4
10kΩ 73 71 3.4
100kΩ 30 29 3.0
1MΩ 9 9 2.4
≥ 10MΩ 3.8 3.8 1.8
NI PXI-2529 ≤ 1kΩ 92 88 3.4
10kΩ 67 65 3.2
100kΩ 29 28 3.0
1MΩ 9 9 2.4
≥ 10MΩ 3.8 3.8 1.8
NI PXI-2530 ≤ 1kΩ 628 626 3.4
10kΩ 188 171 3.4
100kΩ 39 38 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
NI PXI-2532B ≤ 1kΩ 613 473 3.4
10kΩ 177 163 3.4
100kΩ 39 38 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
NI PXI-2535 ≤ 1kΩ 923 639 3.4
10kΩ 197 179 3.4
100kΩ 40 39 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
NI PXI-2575 ≤ 1kΩ 114 108 3.4
10kΩ 78 75 3.4
100kΩ 30 30 3.2
1MΩ 9 9 2.4
≥ 10MΩ 3.8 3.8 1.8
PXIe-2531 ≤ 1kΩ 667 504 3.4
10kΩ 182 167 3.4
100kΩ 39 38 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
PXI-2534 ≤ 1kΩ 288 253 3.4
10kΩ 134 125 3.4
100kΩ 36 36 3.2
1MΩ 10 10 2.6
≥ 10MΩ 3.8 3.8 1.8
PXI-2584 ≤ 1kΩ 367 311 3.4
10kΩ 148 139 3.4
100kΩ 37 36 3.2
1MΩ 10 10 2.6
≥ 10MΩ 3.8 3.8 1.8

 

4-Wire Resistance

The following benchmarks show typical scan rates when using handshaking. The DMM used for testing was the PXIe-4080 set to measure 4-Wire Resistance. Both the measurement resolution and range were varied to illustrate the resulting effect on the scan rate

 

NI PXI-4080 4-Wire Resistance
Switch Module DMM/Switch Scan Rate (cycles/second)
Range Digits of Resolution
≤ 4.5 5.5 6.5
NI PXI-2501 ≤ 1kΩ 884 619 3.4
10kΩ 194 178 3.4
100kΩ 40 39 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 4.0 1.8
NI PXI-2503 ≤ 1kΩ 102 97 3.4
10kΩ 72 70 3.4
100kΩ 29 29 3.0
1MΩ 9 9 2.4
≥ 10MΩ 3.8 3.8 1.8
NI PXI-2527 ≤ 1kΩ 104 99 3.4
10kΩ 73 71 3.4
100kΩ 30 29 3.2
1MΩ 9 9 2.4
≥ 10MΩ 3.8 3.8 1.8
NI PXI-2529 ≤ 1kΩ 92 89 3.4
10kΩ 67 65 3.4
100kΩ 29 28 3.0
1MΩ 9 9 2.4
≥ 10MΩ 3.8 3.8 1.8
NI PXI-2530 ≤ 1kΩ 628 628 3.4
10kΩ 188 171 3.4
100kΩ 39 38 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
NI PXI-2532B ≤ 1kΩ 613 473 3.4
10kΩ 177 163 3.4
100kΩ 39 38 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
NI PXI-2535 ≤ 1kΩ 923 639 3.4
10kΩ 197 180 3.4
100kΩ 40 39 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 4.0 1.8
NI PXI-2575 ≤ 1kΩ 114 108 3.4
10kΩ 78 75 3.4
100kΩ 30 30 3.2
1MΩ 9 9 2.4
≥ 10MΩ 4 4 1.8
PXIe-2531 ≤ 1kΩ 666 505 3.4
10kΩ 182 167 3.4
100kΩ 39 38 3.2
1MΩ 10 10 2.6
≥ 10MΩ 4.0 3.8 1.8
PXI-2534 ≤ 1kΩ 288 253 3.4
10kΩ 134 125 3.4
100kΩ 36 36 3.2
1MΩ 10 10 2.6
≥ 10MΩ 3.8 3.8 1.8
PXI-2584 ≤ 1kΩ 367 312 3.4
10kΩ 148 139 3.4
100kΩ 37 37 3.2
1MΩ 10 10 2.6
≥ 10MΩ 3.8 3.8 1.8

 

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.

 

Additional Note About PXIe-4082

Although the PXIe-4082 was not tested, typical scan rates for the PXIe-4082 should be similar to the ones listed here for the PXIe-4080.