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NI PXIe-4080 - DMM/Switch Handshaking Scan Rates

Updated Jun 24, 2024

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.

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.

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
	Range	≤ 4.5	5.5	6.5
NI PXI-2501	≤ 10V	884	619	3.4
NI PXI-2501	≥ 100V	469	382	3.4
NI PXI-2503	≤ 10V	102	97	3.4
NI PXI-2503	≥ 100V	93	89	3.4
NI PXI-2527	≤ 10V	104	99	3.4
NI PXI-2527	≥ 100V	94	90	3.4
NI PXI-2529	≤ 10V	92	88	3.4
NI PXI-2529	≥ 100V	84	81	3.4
NI PXI-2530	≤ 10V	628	628	3.4
NI PXI-2530	≥ 100V	471	377	3.4
NI PXI-2532B	≤ 10V	613	473	3.4
NI PXI-2532B	≥ 100V	380	321	3.4
NI PXI-2535	≤ 10V	923	639	3.4
NI PXI-2535	≥ 100V	480	389	3.4
NI PXI-2575	≤ 10V	114	108	3.4
NI PXI-2575	≥ 100V	102	97	3.4
PXIe-2531	≤ 10V	666	505	3.4
PXIe-2531	≥ 100V	400	335	3.4
PXI-2534	≤ 10V	288	253	3.4
PXI-2534	≥ 100V	223	202	3.4
PXI-2584	≤ 10V	367	312	3.4
PXI-2584	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
Switch Module	≤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
	Range	≤ 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
	Range	≤ 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.