T4D #34 - 1 Million Views, 5000 Subs, 300th video..and DMMCheck Plus. HD

Quick chat on milestones the channel has reached, overview of the DMMCheck Plus DMMCheck Plus: http://www.voltagestandard.com/DMMCheck_Plus.html --------------------- Click "Show more" ------------------------------- My website and forum:- http://www.mjlorton.com Donations and contributions:- http://www.mjlorton.com My techie channel MJLorton - Solar Power and Electronic Measurement Equipment - http://www.youtube.com/MJLorton My Techie Amazon Store: http://astore.amazon.com/m0711-20 My other channel VBlogMag - For almost any topic under the sun! - http://www.youtube.com/VBlogMag My VBlogMag Amazon Store: http://astore.amazon.com/vblogmag-20 ----------------------------------------------------------------------- I also show: * DMMCheck * PentaRef * DMMCheck Plus Thanks to Doug od Voltagestandard.com The DMMCheck Plus is a battery powered device that checks seven important functions on a DMM: AC and DC Voltage, AC and DC current, Resistance, Frequency, and Duty Cycle. It you have a DVM or DMM that has questionable accuracy, the DMMCheck Plus can give you the confidence you need before relying on your test equipment. Provided on the small (2.5"W x 2.2"L) circuit board are the following circuits: Resistance : Four 0.1%, 10ppm precision resistors are included: 100Ω, 1.00KΩ, 10.00KΩ, and 100.0KΩ DC voltage : 5V, ± 0.01% voltage reference DC current : 1mA, ±0.1% current source AC voltage : 5V RMS, bipolar (+5V, -5V) square wave, ±0.1% voltage source AC current : 1mA RMS, ±0.2% current source Frequency : 100Hz, ±0.02% signal source Duty Cycle : 100Hz, 5V RMS, signal source has 50% ± 0.05% duty cycle An external power supply is not needed; The included 9V battery makes the unit self-contained and easily transported. An on-board on/off switch allows you to maximize battery life when not in use. Reverse polarity protection is included, so even if the battery is placed in the holder backwards no damage will result. When the AC/DC slide switch is in the AC position, AC voltage and AC current reference signals are present at the "V" and "I" terminals. When in the DC position, DC voltage and DC current reference signals are produced. A high brightness, low current LED clearly indicates when the DMMCheck Plus is powered-up. 5VDC VOLTAGE REFERENCE: The 5V reference voltage is based on the Texas Instruments REF5050ID (3ppm/⁰C) precision reference IC. After the DMMCheck Plus is assembled, it is powered up with a 9V power supply for a minimum of 240 hours to "age" the reference and improve its long term stability. After aging, the trim potentiometer is carefully adjusted for a reference output of 5.0000V as measured by our calibrated 8.5 digit HP 3458A DMM that has an accuracy of 0.0008%. (Tektronix Certificate of Calibration # 4787923 valid through January 13, 2013). Accidental movement of the trimpot adjustment is prevented by the application of a small amount of acrylic enamel. The ambient temperature is also recorded (typically 68⁰F). The ci