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Thread: DMM recommendations

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    Default DMM recommendations

    I had to replace a motherboard over the weekend. My GA-Z97X Gaming 7 developed a short. There was a loud pop Friday night. No more run. No more boot. Saturday I went to MC and replaced it with the same board. The i7 4790K is the same on the new board as the old.

    I went to replicate my heatsink testing runs a 4GHz (I'm testing a lower capacity heatsink). Linpack w/o AVX had an auto Vcore of 1.032v displayed on the old board, 1.202v displayed on the new board. Linpack w/AVX had a Vcore of 1.056v on the old board, 1.044v on the new board.

    I suspect I am getting the same VID, so the different Vcore readings -- I think -- are due to manufacturing variations in the motherboards, and do not represent actual Vcore differences. They are with the same CPU, after all.

    So, the time has come for me to abandon software-read Vcores. Since there are measuring points on the motherboard. I can directly measure a number of Voltages, including Vcore.

    Problem: my 30-year-old Radio Shark Voltage multimeter is analog. I need a digital multimeter. One that will measure out to 3 decimal places between 1.0 and 1.4 Volts. Can such a thing be had for under $100? Or should I live with the new board and forget it?
    Last edited by ehume; 06-02-2015 at 09:21 PM.
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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    Default

    I would see if you can find a used Fluke 115, in the 0.001 V - 6.000 V range they have an accuracy of [ ± ([% of reading] + [counts]): 0.5% + 2 ]

    Around ~$100, it's one of the most accurate DMMs you can get that I would also trust. I've seen a few others in this range with similar results but not from brands I know well, thus I wouldn't trust them enough to drop a benjamin on that item.

    Normal price is around $135-150 depending on where you get it from, runs on a simple 9v battery (partly why it's cheap but accurate), and it's pretty damn durable. I can confirm it won't be destroyed by any LN2 spills.

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    Default

    Try a UNI-T UT61E. Solidly built and actually holds up it's calibration much better than entry level flukes.
    No really I risked 80$ by throwing it around for fun.

    With a 22,000 count display it sure wouldn't disappoint. However if you want back lighting you need to get creative or find another meter.

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    Quote Originally Posted by DaveLT View Post
    Try a UNI-T UT61E. Solidly built and actually holds up it's calibration much better than entry level flukes.
    No really I risked 80$ by throwing it around for fun.

    With a 22,000 count display it sure wouldn't disappoint. However if you want back lighting you need to get creative or find another meter.
    That one is $48 at Amazon. The Uni-Trend UT60H OEM has 40,000 counts, $80 at Amazon. This is made by by Sinometer -- in China, apparently. The Fluke 115 is also made in China. Is 40,000 counts more accurate than 6000 counts?

    Fluke 101 advertises "AC (40Hz-500Hz)/DC Voltage---Range:6V, 60V, 600V; Resolution: 0.001V, 0.01V, 0.1V; Accuracy:1%+3(AC), 0.5%+3(DC)"
    Last edited by ehume; 06-03-2015 at 11:29 PM.
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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    Everything is made in China, one or the other

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    Quote Originally Posted by ehume View Post
    That one is $48 at Amazon. The Uni-Trend UT60H OEM has 40,000 counts, $80 at Amazon. This is made by by Sinometer -- in China, apparently. The Fluke 115 is also made in China. Is 40,000 counts more accurate than 6000 counts?

    Fluke 101 advertises "AC (40Hz-500Hz)/DC Voltage---Range:6V, 60V, 600V; Resolution: 0.001V, 0.01V, 0.1V; Accuracy:1%+3(AC), 0.5%+3(DC)"
    Mate we're talking 0.1% accuracy for the UT61E. 80$ is how much it costs in local currency i forgot

    And the UT60H is crap btw.

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    ..
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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    Damn man! The UT61E lacks temperature and all the rest in UT61 series has DC accuracy of +-0,5 %+1.

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    ehume (07-10-2015)

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    Quote Originally Posted by Behemot View Post
    Damn man! The UT61E lacks temperature and all the rest in UT61 series has DC accuracy of +-0,5 %+1.
    If I am reading you correctly, the UT61E has a DC accuracy of +/- 0.5% of Voltage.

    Do you know of a better DMM? OCCT reports Vcore as 1.21v. My MB reports current Vcore as 1.212v. But they are both operating from the same sensor. If is it systematically off by 0.1v (0,1v), then the actual Vcore could be anywhere between 1.11 (1.112) to 1.31 (1.312) Volts.

    Still, approximately
    An 0.1v error would be a 10% error.
    An 0.01v error would be a 1% error.
    An 0.001v error would be a 0.1% error.

    How well Do DMM's discriminate between Voltages at the 1-1.5v range?

    If you were to buy a DMM, which would you get? And what would its accuracy be at 1 to 1.5v?

    And temperature? I did not know they measured that.
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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    What? I am complaining about the UT61E (enhanced?) lacking temperature while the UT61B which has temperature as well as all the other UT61 have worse DC accuracy.

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