飞时科技（北京）有限公司
飞时科技（北京）有限公司
LNHR DAC是瑞士Basel Precision Instruments的一种具有突出的噪声和分辨率性能的多通道电压源，用来驱动低温物理实验中的高欧姆门。这类实验往往需要直流偏置电压超稳定，扫描电压极低波动高分辨率。它拥有± 10 V的输出范围，24位的分辨率，调节步长仅为1.2 μ V的电压。LNHR DAC可用于直流叠加、斜坡/扫频和低频波形的产生。
●12或24个独立DAC通道
●24位分辨率
●步进扫描电压为1.2 µ V（整个± 10 V输出范围内）
●综合输出噪声 0.3 Vrms
●超低漂移 1 μ V /℃+ 1.5 ppm /℃
●浮地输出
●输出电流10 mA
●带宽可在100 Hz和100k Hz切换
●AWG功能
●自适应快速扫描
●栅极漏电流测量箱
●安装在LNHR DAC输出端和采样端之间
●在运行实验过程中监测电流
●6个通道并联
●PA ~ 10 µ A范围
●不会增加栅极电压噪声或恶化稳定性
型号 | LNHR DACII-12 （New） | LNHR DACII-24 （New） | |
产品代码 | SP1060-12 | SP1060-24 | |
输出DAC 通道 | 12 | 24 | |
精度 | 24-bit | ||
输出电压范围/步进 | ±10 V range / 1.2 µV step size | ||
漏电电流检测 | pA detection is possible using ad-on gate leakage box | ||
输出电压噪声 | 100 Hz BW: typ. 0.3 µVrms，100 kHz BW: typ. 4 µVrms | ||
温漂 (for entire ±10V output range) | typ. 1 µV/ °C + 1.5 ppm/ °C (ppm from actual voltage output) | ||
超过8小时温漂 | < 10 µV | ||
带宽 | switchable between 100 Hz and 100 kHz for each DAC channel | ||
任意波形输出 | 2 AWGs assigned to any channel | 4 AWGs assigned to any channel | |
自定义输出波形 | Sine, triangle, sawtooth, ramp, pulse, gaussian-noise | ||
斜坡函数 | 4 independent ramp generators with adaptive scan feature (gate compensation) | ||
输出电流 | ±10 mA max on each channel ± 25 mA max on each 12-channel board | ||
接地 | Output ground is isolated from housing and computer interface | ||
输出接地和外壳之间的外部偏置电压 | 20 V max | ||
输出阻抗 | 550 Ω | 50 Ω | |
尺寸 | 48 x 10 x 43 cm | ||
在敏感实验中应用具有非常低波动的超稳定DC偏置电压和高分辨率扫描电压：
●低温量子实验中高欧姆门的驱动
●在量子输运测量中应用源漏电压
●控制对静电电荷高度敏感的样品，如约瑟夫逊结或量子点
噪声密度谱和累积噪声（单通道）
The outstanding noise performance of the LNHR DACII is shown here. This plot shows the noise density spectrum (red) and the integrated noise (blue) at 0 V, 5 V, and 10 V output and the low-bandwidth setting (BW=100 Hz). Data for high bandwidth setting (100k Hz) is shown in the user manual. For this specific measurement, the integrated noise from 0.1 Hz to 100 Hz ~170 nVrms at 0 V output; even better than the 300 nV stated in the table above . The European mains-frequency of 50 Hz and some of its harmonics can be identified on the noise density spectrum . However, those peaks do not add significantly to the total noise voltage as seen on the integrated noise . For frequencies above 100 Hz the noise density drops due to 100 Hz LP-filter and reaches the noise floor of 1 nV/√ Hz at 900 Hz originating from the differential amplifier used for measurements.
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