重庆汗丁直销Keithley吉时利双通道毫微2182A型纳伏表
重庆汗丁直销Keithley吉时利双通道毫微2182A型纳伏表产品概述：
The two-channel Model 2182A Nanovoltmeter is optimized for making stable, low noise voltage measurements and for characterizing low resistance materials and devices reliably and repeatably. It provides higher measurement speed and significantly better noise performance than alternative low voltage measurement solutions. The Model 2182A represents the next step forward in Keithley nanovoltmeter technology, replacing the original Model 2182 and offering enhanced capabilities including pulse capability, lower measurement noise, faster current reversals, and a simplified delta mode for making resistance measurements in combination with a reversing current source, such as the Model 6220 or 6221.
重庆汗丁直销Keithley吉时利双通道毫微2182A型纳伏表产品性能特点：
• Make low noise measurements at high speeds, typically just 15nV p-p noise at 1s response time, 40–50nV p-p noise at 60ms
• Delta mode coordinates measurements with a reversing current source at up to 24Hz with 30nV p-p noise (typical) for one reading. Averages multiple readings for greater noise reduction
• Synchronization to line provides 110dB NMRR and minimizes the effect of AC common-mode currents
• Dual channels support measuring voltage, temperature, or the ratio of an unknown resistance to a reference resistor
• Built-in thermocouple linearization and cold junction compensation
特点
优势
1nV 灵敏度 提供**的超低电压测量。 1s 响应时间下的噪声通常只有 15nVp-p，60ms 下噪声为 40–50nV p-p 确保在广泛的有用响应时间下实现低噪声电平。 双通道 支持测量电压、温度或未知电阻与参考电阻的比值。 测量周期与电源线交流周期同步 *小化由于线路周期不同阶段的起始读数导致的变化。 其结果是线路抗扰能力非常高，基本或根本不需要进行屏蔽或滤波。 内置热电偶线性化和冷接点补偿 简化了进行**温度测量的过程。 内部极性反转测量技术 消除热误差源。 *适合用于 6220/6221 型电流源 进行微分电导、脉冲和电阻测量时，允许将这两台仪器作为一台单独的仪器来运行。 与 6220 或 6221 结合使用时，支持增量模式电流反向测量技术 支持低至 10nΩ 的电阻测量。 2182A/6221 组合将信号脉冲与测量同步 将温度敏感型 DUT 的功耗降至*低。
重庆汗丁直销Keithley吉时利双通道毫微2182A型纳伏表产品测量模式：
Flexible, Effective Speed/Noise Trade-offs
The Model 2182A makes it easy to choose the best speed/filter combination for a particular application’s response time and noise level requirements. The ability to select from a wide range of response times allows optimizing speed/noise trade-offs. Low noise levels are assured over a wide range of useful response times, e.g., 15nV p-p noise at 1s and 40-50nV p-p noise at 60ms are typical. Figure 1 illustrates the Model 2182A’s noise performance.
Reliable Results
Power line noise can compromise measurement accuracy significantly at the nanovolt level. The Model 2182A reduces this interference by synchronizing its measurement cycle to line, which minimizes variations due to readings that begin at different phases of the line cycle. The result is exceptionally high immunity to line interference with little or no shielding and filtering required.
Optimized for Use with Model 6220/6221 Current Sources
Device test and characterization for today’s very small and power-efficient electronics requires sourcing low current levels, which demands the use of a precision, low current source. Lower stimulus currents produce lower—ａnd harder to measure—voltages across the devices. Linking the Model 2182A Nanovoltmeter with a Model 6220 or 6221 Current Source makes it possible to address both of these challenges in one easy-to-use configuration.
When connected, the Model 2182A and Model 6220 or 6221 can be operated like a single instrument. Their simple connections eliminate the isolation and noise current problems that plague other solutions. The Model 2182A/622X combination allows making delta mode and differential conductance measurements faster and with less noise than the original Model 2182 design allowed. The Model 2182A will also work together with the Model 6221 to make pulse-mode measurements.
The 2182A/622X combination is ideal for a variety of applications, including resistance measurements, pulsed I-V measurements, and differential conductance measurements, providing significant advantages over earlier solutions like lock-in amplifiers or AC resistance bridges. The 2182A/622X combination is also well suited for many nanotechnology applications because it can measure resistance without dissipating much power into the device under test (DUT), which would otherwise invalidate results or even destroy the DUT.
An Easy-to-Use Delta Mode
Keithley originally created the delta mode method for measuring voltage and resistance for the Model 2182 and a triggerable external current source, such as the Model 2400 SourceMeter® SMU instrument. Basically, the delta mode automatically triggers the current source to alternate the signal polarity, and then triggers a nanovoltmeter reading at each polarity. This current reversal technique
cancels out any constant thermoelectric offsets, so the results reflect the true value of the voltage being measured. The improved delta mode for the Model 2182A and the Model 622X current sources uses the same basic technique, but the way in which it’s implemented has been simplified dramatically. The new technique can cancel thermoelectric offsets that drift over time (not just static offsets), produces results in half the time of the original technique, and allows the current source to control and configure the Model 2182A. Two key presses are all that’s required to set up the measurement. The improved cancellation and higher reading rates reduce measurement noise to as little as 1nV.
重庆汗丁直销Keithley吉时利双通道毫微2182A型纳伏表产品技术规范：
