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NI PXIe-4080 - DMM/Switch Handshaking Scan Rates
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
- Scan Rate Benchmarks
- Optimizing System Scan Rate
- Additional Note About PXIe-4082
- Related Links
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.
