有人测过这个10V标准源吗？看指标不错。
http://www.ebay.com/itm/10-VDC-2ppm-Precision-Voltage-Reference-Standard-Nulled-to-Fluke-732A-or-732B-/251756273626?pt=LH_DefaultDomain_0&hash=item3a9dd7dfda#shpCntId可邮寄到中国。
The item is the Calibratory D-105 DC, 10.0VDC Precision Voltage Reference Standard. It accepts 12VDC to 35VDC INPUT. The OUTPUT is 10.000000 VDC ±0.0002% (±2ppm) at 14.5VDC (+-2.0VDC) INPUT. The other unit we have listed—The D-104 DC—is a +-0.0006% (+-6ppm) unit. That, temperature-control, and the price, are the only difference between this unit: the D-105 DC and our novice product, the D-104 DC. The D-105 DC has (4) four color-coded, gold-plated banana-sockets w/binding posts for INPUT and OUTPUT connections. The internal connections are soldered or bolted. The regulator IC is socketed, so it is not heated by soldering. We incorporate the precision voltage reference IC—TI REF102C—together with noise filtering, thermoelectric damping, and a trim circuit. Among the photos is a laboratory null voltage-offset setup. The reading is on the mVDC range. The meter reads: 0.0092mVDC (9.2uVDC; 0.92ppm). That is the maximum difference between the 732A 10.000000VDC OUTPUT and the 10.000000VDC OUTPUT of the Calibratory D-105 DC Precision Voltage Reference Standard at its maximum actual error. Our claim of 6ppm at 10VDC is conservative! The null setup is as follows: Fluke 732A OUTPUT (-)ground(-) to OUTPUT (-)ground(-) on the Calibratory D-105 DC Precision Voltage Reference Standard. Power Supply 14.5 Volt DC (+) and (-) to INPUT of the Calibratory D-105 DC Precision Voltage Reference Standard; (+) 10.0VDC (+) OUTPUT of Fluke 732A to DMM (-) low (-); (+) 10VDC (+) OUTPUT of Calibratory D-105 DC Precision Voltage Reference Standard to (+) DMM (+). All units are nulled to a 732A or 732B Precision Voltage Reference. Recalibration is available anytime. The Calibratory D-105 DC Precision Voltage Reference Standard may also be powered by (2) 9V alkaline batteries wired in series. The device settles in roughly five minutes. Maximum output load is 8.0 mA. The unit is durable and maintenance-free.Long-termdrift is ~1ppm/1,000 hours of use, and decreases with age. The unit measures approximately 1.5" x 2.25" x 1.75". Test equipment and patch cords are not included. Questions, use the link below. Thank you for viewing our eBay.com listing! We customize calibration parameters for free, i.e. input voltage, temperature, etc..
基准是TI REF102C 楼主快抢啊，挂了几个月了就等你了{:142_381:} 5ppm/1000小时稳定度的器件，做成1ppm/1000小时稳定度的产品，不知道采用了什么技术。 说是采用noise filtering（噪声过滤）, thermoelectric damping（热电阻尼）, and a trim circuit（微调电路）3种方式提高性能
只是LT廠方的典型線路,但把元件的數值改變了一些,REF102C的第4腳及6腳各接一技20K電阻,中間用2K的可變調節;2K的中點串接一枝75K電阻連接第5腳就是了.不過長穩較差. 热电阻尼
是什么技术 本帖最后由 pryprypry 于 2015-5-17 03:10 编辑
这个玩意大家看看就算了吧,这个基准和588一个级别的其实,最差可达40ppm/年(588还要糟糕些,大概120ppm/年),不是楼上说的5ppm/年(否则还要LM399干嘛,399的稳定性稍加筛选10ppm/年之内,并且其稳定性指标是根号千小时,不是千小时,大家注意这两个单位区别),大家不想用588的可以换换口味用这个,但是这玩意价格和灵活性都比588差得远,我的低等级基准源还是选择了588而不是这个.反正我经常向LTZ校准588,就没必要用这个了.在我的试制8.5DVM里面倒是打算用做内置基准,因为这个体积小
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