Recent content by billcushman

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    skyrc mc3000 (help build!) quick reference guide to programs

    Re: skyrc mc3000 quick reference guide to programs This information is now almost a year old, but it may be helpful to get new users started. The MC3000 is very easy to use after you create a few programs. The default values are OK most of the time. I suggest that you select ENELOOP STD AA...
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    Advice Needed On Lux Meters

    My statement is absolutely correct. Even the most expensive filters cannot approach the accuracy of a spectroradiometer. NIST has published extensive data on this subject. A typical spectroradiometer has 256 channels and measures the stimulus in 5 nanometer bands. The photopic curve is...
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    Advice Needed On Lux Meters

    The Extech LT45 will give good results on most conventional and LED light sources. Download and read the User Manual. It is the most accurate cheap (less than $300) meter and it compares pretty well to a $10K+ Spectroradiometer. Accurate Lux measurements are very difficult to achieve and...
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    Fenix ARE-C2 charger question

    I purchased 2 ThruNite MCC-4 chargers on Amazon. This charger appears to be identical to the Fenix ARE-C2. Both of my samples charged to 4.21 to 4.23 volts. This meets the normal spec of 4.2 ±0.05 volts DC, but I don't like to charge over 4.2 so I returned both for a refund. Slightly lower...
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    Tesla's gigafactory dropping 18650's and going with 20700 - per Elon Musk

    This is an interesting discussion about the Tesla Battery. https://www.youtube.com/watch?v=VbVpPSa6glA
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    Tesla's gigafactory dropping 18650's and going with 20700 - per Elon Musk

    I watched the whole 3 1/2 hour presentation of the Tesla Stockholders Meeting in which Elon Musk and their CTO JB Straubel described all the details of their history. The 18650 battery they use is not like the 18650 we can buy from Panasonic. It is specialized for their application. The...
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    Checking my DMM DC Voltage Accuracy

    Doug Malone at VoltageStandard makes fine products. I have a PentaRef with outputs of 2, 4, 6, 8, and 10 volts. It is especially nice for handheld DMMs. All the voltages are exact to nominal for three places past the decimal. They may vary from nominal by one digit on the fourth digit after...
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    SkyRC — IFA 2014 — MC3000 charger-analyzer

    Re: 2nd gen dreamcharger presented on IFA Berlin 2014… Where did you buy your MC3000s? When were they delivered? Thanks.
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    Checking my DMM DC Voltage Accuracy

    The most accurate plastic cased AD584 unit was advertised as KKMOON High Precision, fulfilled by Amazon. It was like the link in the message to John. The cal dates on both the AD584 units was 2015. Both units have AD584KH devices (not sure if they are genuine). I also checked using a Doug...
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    Checking my DMM DC Voltage Accuracy

    John, watch this video starting at 16 minutes in. It shows the easy to use unit in operation. https://www.youtube.com/watch?v=zm_ZBT4t4dA
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    Checking my DMM DC Voltage Accuracy

    John, here is a link to one of the easy to use units. http://www.ebay.com/itm/KKMOON-High-Precision-Voltage-Reference-Module-AD584kH-Single-button-Operation-/201373831871?hash=item2ee2d0d2bf:g:caoAAOSw-vlVg5aZ You need a 5 volt supply with a 5.5/2.1mm plug to charge the battery. Don't exceed...
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    Checking my DMM DC Voltage Accuracy

    John, since my last post on this subject, I bought an Agilent 34401a 6 1/2 digit DMM. My unit appears to be accurate to within 5 PPM. I have carefully measured the AD584LH reference that is like yours with an identical data sheet. At turn on the unit measured 2.49857, 5.00134, 7.49997, and...
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    Checking my DMM DC Voltage Accuracy

    John, I also received the same AD584LH voltage reference from MS Huang in Guangdong. The data sheet included with my unit is IDENTICAL to your unit in every detail. I find this extremely unlikely. The documentation appears to be inaccurate. I ordered a PentaRef with outputs of 2, 4, 6, 8...
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    Checking my DMM DC Voltage Accuracy

    Gauss163, I could easily adjust my UT61e above or below the desired value. My unit was almost 13% low on DCV when received. This required a significant rotation of the multi turn pot. It is now within 1 or max 2 counts at 2.5, 5.0, 7.5, and 10.0 volts. I checked ACV,@120V, mVDC, capacitance...
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    Checking my DMM DC Voltage Accuracy

    John, did you calibrate your UT61e. I bought one to have a low cost quality meter and it did not meet specs on DC voltage. Tt was easy to calibrate and it is now within 2 counts on 2.5, 5.0, 7.5, and 10.0 volts. I checked all other functions and they were well within specs. Did yours have an...
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