Multimeter frequency response



While playing with a couple of high-end DMM's I started wondering how linear their frequency response was, they where all rated for at least 100kHz. With TestController and a ARB I could easily test it and also include a couple of bench and other meters.
I test from 50Hz to 500kHz with 1Vrms, the mV and next higher voltage range may not have the same frequency response. I would have liked to run a test at higher voltage also, but my ARB cannot deliver enough when loading it with 50ohm.



Contents
    Setup
    Results
        Benning MM 12
        Brymen BM525s
        Brymen BM829s
        Brymen BM869s
        Chauvin Arnoux CA5293
        Fluke 189
        Fluke 289
        Fluke 8846A
        Gossen Energy
        Gossen PM Prime
        Hioki DT4286
        Keithley DMM6500
        Keithley DM7510
        Keysight 34465A
        Keysight 34470A
        Keysight U1252A
        Keysight U1272A
        Keysight U1282A
        Kyoritsu KEW1062
        Siglent SDM3055 (From reader)
        Fluke 867B (From reader)
        Fluke 8840A (From reader)


Setup

In TestController I need the DMM for test and my ARB (Siglent SDG2122X), then it is just configuring the ARB and use "Params Sweeper" to do the test:



For the connection I use a coax cable with termination close to the DMM, this will give the most linear frequency signal.





ParamSweeper do a single sweep of the frequency generator with 300 points, this gives a fairly detailed curve and takes about 5 minutes for one curve. By filling out the log line on ParamSweeper I directly save the file and a chart. I have to configure the chart before the sweep is finished, i.e. define scale for the DMM and select frequency as X-axis. The chart will use the resolution from the configuration "Save images sizes" topmost slot. Most of this can be saved as a script and easily be performed for each test.

All test are done on the main AC range for the multimeter, i.e. not AC+DC.



Results



Benning MM 12





Brymen BM525s





Brymen BM829s





Brymen BM869s





Chauvin Arnoux CA5293





Fluke 189





Fluke 289





Fluke 8846A





Gossen Energy









Gossen PM Prime





Hioki DT4286





Keithley DMM6500





Keithley DM7510





Keysight 34465A





Keysight 34470A





Keysight U1252A





Keysight U1272A





Keysight U1282A





Kyoritsu KEW1062




Siglent SDM3055 (From reader)




Fluke 867B (From reader)




Fluke 8840A (From reader)





Conclusion

All meters works nicely up to 20kHz (i.e. audio range), but above there is a few percent deviations on some meters. I have not compared to specifications, but I would expect them to be well within.



Notes


I have not tested all my meters, only the ones I had close to my main test bench.