5VDC .01% Precision Voltage Reference Standard, US $28.50 – Picture 0

5VDC .01% Precision Voltage Reference Standard, US $28.50 – Picture 1

5vdc .01% Precision Voltage Reference Standard

US $28.50

Battle Ground, Washington, United States
Jan 29th

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This small, portable, precision voltage reference can be used to check the calibration of your DVM or DMM. The VREF5-01 features a 5.0000V output, accurate within 0.01% (output guaranteed to be between 4.9995 and 5.0005 Volts) for a minimum of 6 months. The circuit is based on the Texas Instruments' REF5050ID Voltage Reference. Here is a link to the data sheet on the TI web site: http://focus.ti.com/lit/ds/symlink/ref5050.pdf The circuit board was designed to minimize the effects of mechanical stress on the reference IC. Specifically, the REF5050 was placed on the edge of the board and 2 adjacent slots decouple stresses in the board from reaching the reference which could otherwise cause the output voltage to shift. The REF5050 is carefully and quickly soldered to the board and every one of the references that we have sold easily exceed the specifications listed above. 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. A high brightness, low current LED clearly indicates when the reference is turned on. The worst-case change with temperature is a low 5ppm/C or only +- 25uV / oC. The reference chip itself has a temperature coefficient of 3ppm/C and the output trim adjustment adds another approximately 2ppm. Before shipping, the ambient temperature and output voltage are recorded as explained below. To guarantee a 5V output within .01%, your ambient temperature must be within 8oC (14oF) of the stated calibration temperature. In a typical indoor environment this usually isn't much of a restriction. After the unit is assembled, it is powered up with a 9.0V power supply for a minimum of 250 hours to "age" the reference and improve its long term stability. After aging, the trim potentiometer is carefully adjusted so that the reference voltage is within 5uV of 5.00000V as measured by our calibrated, 8.5 digit HP 3458A DMM. (Agilent Technologies, Loveland Standards and Calibration Labs, Certificate of Calibration 1-5608246195-1, valid through January 14, 2015). The ambient temperature is also recorded (typically 68oF). This reference circuit is very similar to what was described in our article in the September 2007 issue of Nuts and Volts magazine, "Build a .01% Accurate Voltage Reference" http://nutsvolts.texterity.com/nutsvolts/200709/?folio=52. The Nuts and Volts reference was based on the Intersil X60008 reference chip and numerous reference assemblies were sold through eBay. Unfortunately, Intersil has discontinued production of the X60008 and it is no longer available. The REF5050 is vastly superior to the X60008, and most other reference chips, in one respect: line regulation. The X60008 output voltage could vary as much as 100uV for every volt away from its 'sweet spot' of 6.5V input. The REF5050 output is guaranteed, however, to vary only 5uV per Volt. In practical terms this means that with a fresh 9V battery and a 5.00000V output, when the battery gets down to, say, 6V the output will have changed only 15uV! Recalibration of the VREF5-01 is free for the first two years after purchase - just send it back to us and include $4.00 in stamps for return shipping within the USA. After two years the calibration charge is $5.00 plus shipping. Please inquire for shipping charges to destinations outside USA. 2.048V, 2.500V, 3.000V, 4.096V, and 4.500V references are also available; please specify desired voltage when placing order. Designed, assembled, and calibrated in USA

Condition:

New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. ...

Country/Region of Manufacture

United States