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I’d expect this command to be fast and it is, with one exception – the HMP4040 in USB CDC mode which seems to lag behind everyone else significantly. The only command tested by lxi-tools and perhaps the most basic of commands asks for the identity of an instrument. This was followed by the KE2450 and E36103A managing around 50ms, the NGM202 managing in about 100ms, the BK8600 requiring about 250ms, the NGU401 requiring about 305ms and the QPX750SP and RTM3004 requiring around 365ms. The quickest was the KE2110 at 13.4ms then HMP4040 at 26.5ms. Results (Per Command)Īmongst all benchmarked commands, resetting the instrument to defaults took most devices the longest amount of time compared to other commands. INP 0 and INP 1 for DC electronic loads for example).Īs I’m sure someone may ask – I have decided to release the raw data as a csv file if you are interested. There are probably variations of the commands which are worth including in future versions, especially targeting different types of instruments (e.g. Not all devices will support all tested commands, so data is not available where the device does not support the given command. While they are specific to my test setup, they should be accurate to within about 1ms or thereabouts. The results from this benchmarking experiment were an extensive table of numbers. My Rohde & Schwarz HMC8043 was not tested as it is not in my possession at this time, while the B&K Precision BA6010 Battery Analyser was not tested due to unstable communications (as noted in its review) and the Tektronix PA1000 Power Analyzer was not tested as it does not support the necessary commands and insists on having “:” at the beginning of each non-common command. In the case of the K2110 and BK8600, both are USB-only so LAN SOCKET tests were done via my Raspberry Pi-powered Python USB-TMC bridge script.
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For the E36103A, it seems something is wrong with the LAN VXI-11 support resulting in communication hangs, so LAN SOCKET was used instead. In the case of the HMP4040, there were some issues getting USB TMC to work stably so USB CDC was used instead. As HiSLIP support is not universal, VXI-11 was tested as well for instruments supporting HiSLIP. Whether it says LAN VXI-11 -> LAN SOCKET and USB TMC -> USB CDC in order of preference, but some exceptions did occur. When it comes to datasheets, often the performance for SCPI remote control is boiled down to a single, vague figure. I have been fortunate enough to have been selected as a reviewer for numerous types of test equipment over the years and have been a big advocate for the use of SCPI automation, I have seen differences between different products in terms of their capabilities.