美国2701C直流源
淘了一台美国2701C直流源，粗测了一下，还不错。见图：200mv档
2V档
20V档
120v档
1200V档
R6871是病机修来的，用FLUKE343A随便校了一下，不知道准不准，大家随便看看吧。 这个直流源噪音如何？uv位跳不跳？ 应该一般吧，LM399的基准，测10V，大部分时间显示9.999856-9.999873，主要是6x，偶尔有跳超的。 对如何评价不太懂 PWM的直流源，噪音始终是个高技术问题
有空拍几张内部的清晰大图让我们开开眼，感觉这么小的体积做出来这个基准源还是很有技术水准的，毕竟像5440B之类的都超大体积 好东东，顶一下！烦请LZ有时间上个内部图看看！ 这个源多少米收的？ lbsylh 发表于 2013-12-16 23:59
应该一般吧，LM399的基准，测10V，大部分时间显示9.999856-9.999873，主要是6x，偶尔有跳超的。
不错微伏级也就1个字,不知24小时的稳定如何.
anyuzhi 发表于 2013-12-17 14:34
不错微伏级也就1个字,不知24小时的稳定如何.
看错了差一个数量级.
不错的基准源，台表也好，前一阵好像在哪个坛子里有人出 很好，我也心动。
内部图来了：
有个问题，捆在一起的4个兰色电容下面的omron继电器有时不断闭合/断开，有时长时间正常接通。不知道是不是哪个元件热稳定性不好了。
没有可调的地方，估计是软件校正的，这下校正麻烦了。 找到厂家网址了，有校准方法，有手册，校准超简单。
看介绍:
Valhalla 2701C Programmable Precision DC Voltage Calibrators Features Include:
"Cover-on" Automatic Calibration
100% Over-Range
Automatic Bi-polar Output
Built-in Kilovolt Amplifier
One Touch Local and Remote Sensing
200mV Full Scale Divided Output Range
All Outputs available through one set of Terminals
Micro-processor Enhanced Reliability
5 Voltage Ranges (200mV through 1200V)
Front and Rear Terminals
Illuminated High Voltage Warning
0.5 PPM Resolution
Calibration Traceable to NIST 厂家网址：http://www.valhallascientific.com/calibrators/cal-2701c.shtml SPECIFICATIONS
Accuracy
PPM OF SETTING ± RANGE NOISE
From Factory 1 Year
200mV ± 20 ppm ± 1V ± 30 ppm ± 2V
2V ± 15 ppm ± 4V ± 25 ppm ± 6V
20V ± 13 ppm ± 13V ± 22 ppm ± 50V
120V ± 14 ppm ± 250V ± 23 ppm ± 400V
1200V ± 15 ppm ± 2.5V ± 24 ppm ± 4V
Noise & Stability
RANGE NOISE (0.1 TO 10HZ) 24HR STABILITY (DC TO 0.2HZ)
200mV 1V 1V
2V 2V ± 0.5 ppm ± 2V
20V 15V ± 0.5 ppm ± 10V
120V 150V ± 0.5 ppm ± 100V
1200V 1.5mV ± 0.5 ppm ± 1mV
Temperature Coefficient
The temperature coefficient adder is applicable only when outside of the ± 5°C window of the calibration temperature.
RANGE PPM OF SETTING + V/1°C
200mV 2.5 ppm + 0.1
2V 1.5ppm + 0.6
20V 1.5ppm + 6
120V 1.5ppm + 30
1200V 1.5ppm + 300
General Performance Characteristics
The table below gives the general operating characteristics of the 2701C. Resolution refers to the minimum adjustment that may be made in the selected range. Max Current refers to the maximum amount of current that may be supplied by the selected range without affecting its accuracy (4-wire mode must be used). Wideband Noise refers to the maximum amount of microprocessor and power supply noise (from 10Hz to 10kHz) that may be present on the output voltage. The Linearity of the 2701C is defined as the maximum allowable deviation from a straight line between the zero and full-scale outputs on each range. Output Impedance refers to the impedance of the voltage amplifier.
2701C PERFORMANCE CHARACTERISTICS
Range Resolution Max Current Wideband Noise Linearity Output Impedance
200mV 100nV --- 25VRMS ± 0.5V 450
2V 1V 25mA 80VRMS ± 1V 1m
20V 10V 25mA 130VRMS ± 10V 5m
120V 100V 25mA 500VRMS ± 100V 50m
1200V 1mV 25mA 800VRMS ± 1mV 500m
Output Settling Time
The table below gives the maximum allowable error remaining after the given time following a change in output voltage. The errors are given in ppm of output voltage change.
RANGE 0.5 SECONDS 1 SECOND 10 SECONDS
20V and below 20 ppm 5 ppm 1 ppm
120V 30 ppm 7 ppm 2 ppm
1200V 50 ppm 10 ppm 5 ppm
Other Specifications
Warm-up Time: 15 seconds to within 15 ppm of final value 30 minutes to rated specifications
Power: 115/230V ± 10% at 45 to 65Hz at 80VA
Size: 89mm (3.5") high x 432mm (17") wide x 432mm (17") deep
Weight: 11Kg (24lbs) net, 13Kg (29lbs) shipping
Operating Temperature Range: 0 to 50°C
Storage: -30°C to 70°C
Humidity: 70% RH max at 40°C (non-condensing)
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