10VDC .003% Precision Voltage Reference Standard, US $48.00 – Picture 0

10VDC .003% Precision Voltage Reference Standard, US $48.00 – Picture 1

10VDC .003% Precision Voltage Reference Standard, US $48.00 – Picture 2

10VDC .003% Precision Voltage Reference Standard, US $48.00 – Picture 3

10VDC .003% Precision Voltage Reference Standard, US $48.00 – Picture 4

10vdc .003% Precision Voltage Reference Standard

US $48.00

Battle Ground, Washington, United States
Feb 14th

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This small, portable, precision voltage reference can be used to check the calibration of your DVM or DMM. The VREF10 features a 10.00000V output, and is conservatively rated to be accurate within 0.003% for a minimum of 6 months. The circuit is based on the Linear Technology LT1021BCN8-10 which uses buried Zener technology resulting in excellent long term stability. Here is a link to the LT1021 datasheet on the Linear Technology website: http://cds.linear.com/docs/en/datasheet/1021fc.pdf As shown in the pictures, the circuit board was designed to minimize the effects of mechanical stress on the reference IC. Specifically, the LT1021 is 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. Having designed and built battery powered DC voltage references for over seven years, we have acquired the skill to carefully and quickly solder the reference IC to the board without degrading its performance. An external power supply is not needed. Two Alkaline 9V batteries are included which makes the unit completely self contained and easily transported. An on-board on/off switch allows you to maximize battery life when not in use. Current drain is less than 5mA so the batteries will last many 10's of hours. An on board voltage regulator supplies a constant input voltage to the LT1021 as the batteries slowly decrease to their replacement voltage of 7V. Reverse polarity protection is included, so even if one or both batteries is placed in their holder backwards, no damage will result. A high brightness, low current LED clearly indicates when the unit is powered on. After the unit is assembled, it is powered up with an 18V power supply for a minimum of 250 hours to " age" the reference and confirm its long term stability. After aging, a trim potentiometer is carefully adjusted so that the output voltage is within 5uv of 10.000000V as measured by our calibrated, 8.5 digit Agilent 3458A DMM. (Agilent technologies, Loveland Standards Calibration Labs, Certificate 1-5608246195-1, valid through January 15, 2015). The ambient temperature is recorded and unless specified otherwise will be in the range 68 to 70 degrees F. A "Measured Values" certificate is included as shown in the fourth listing photo. We can perform calibration at temperatures between 65 and 80 degrees- please specify on your order if you need a cal outside standard 68-70 F range at no extra charge. The last listing photo shows stability over a 6 month period for one of our test units. Day to day variations are due to ambient temperature changes. If desired, the VREF10 can be powered by an external DC power supply instead of using the included batteries. It is recommended that a linear (as opposed to switching) supply be used and all VREF10 specifications are met as long as the external supply voltage is between 14V and 19V. If an external power supply is used, the supplied batteries should be removed from their holders and the + supply output connects to the + terminal of Batt 1 on the VREF10 circuit board and the - supply output connects to the - terminal of Batt 2. As shown in the listing photos, the 9V battery holder terminals stick up through the circuit board and can be used as the tie points for an external supply or the connection point for a DMM to measure the battery voltage. There are two distinct advantages to the VREF10 being battery powered. First, there is no possibility of power supply noise/ripple from getting onto the reference output. Second, since the battery power supply for the VREF10 is completely isolated from ground and any circuit connections you may make, multiple units can be can be connected in series to generate 20V, 30V or more. For maximum accuracy it is recommended that the reference be powered-up several minutes before use; typical settling time is about 2 minutes as shown in the third listing photo. As a benefit to our customers, and to keep the cost of ownership as low as possible, recalibration 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 $4.00 shipping. Please inquire for shipping charges to destinations outside the USA. Specification Summary: Voltage reference IC: Linear Technology LT1021BCN8-10 6 month output voltage accuracy: 0.003% Output voltage temperature coefficient: 4ppm/C typical Maximum output load current: 10mA; LT1021 has short circuit protection Load regulation: 20ppm/mA max, 10ppm/mA typ Power source: two Alkaline 9V batteries (supplied) Current drain: less than 5mA Dimensions: 3"W x 3"L x 1.25"H Designed, assembled, and calibrated in the 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. ...	MPN	VREF10
Country/Region of Manufacture	United States