| 1. | Frequency accuracy check at 6 different frequency settings at one voltage level ( normally at 1 v )
一个电压电平(一般为1v )六个不同频率的频率准确度检查。 |
| 2. | The 33250a tcxo timebase gives you frequency accuracy of 1 ppm for your most demanding applications
33250a tcxo时基可达到1ppm频率准确度,从而适应有最严格要求的应用 |
| 3. | In every signal you produce , from the sine wave frequency accuracy to the fast rise fall times of square waves , to
其好处是您能修饰所产生的每一个信号,从正弦波的频率精度方波 |
| 4. | Additional voltage measurement at other frequency settings as well as frequency accuracy check may be offered at extra charge
本所亦可提供在其他频率的电压测量服务及频率准确度检查，但须另行收费。 |
| 5. | The basic calibration of a rf signal generator normally includes tests on output level accuracy , level flatness , and frequency accuracy
射频信号发生器的基本校正工作一般包括测试输出电平准确度、电平不平坦度及频率准确度。 |
| 6. | The laboratory offers calibration service for watchesstop watches with internal crystal and step motor . the calibration of watchesstop watches includes the measurement of its relative frequency accuracy
计时表本所为石英及机械表提供校正服务，包括测量计时表内部频率的准确度。 |
| 7. | The calibration of a spectrum analyser normally includes checks on frequency accuracy , level flatness , level linearity , input attenuation and calibration reference output
频谱分析器的校正工作一般包括检查频率准确度、功率电平不平坦度、标度线性、输入衰减及参考输出值的校正。 |
| 8. | The merits of dds such as super fine frequency resdutlon 、 high frequency accuracy 、 easy programmed can be in combination with the excellent character of narrow - band tracing filter merits of pll
它可以将dds的超高频率分辨率、高频率精确度、容易实现程控等优点与锁相环良好的窄带跟踪滤波特性相结合。 |
| 9. | By making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution 、 high frequency accuracy 、 very fast frequency hoping with it , the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step . while the electronically tuned filter abates the image interference and notably improves the selectivity . the theorem of frequency synthesizer and center - frequency - fixed filter is simply but adequately introduced first in this paper
课题中所采用的pll或dds pll锁相频率合成方法充分发挥锁相环良好的窄带跟踪滤波特性，并结合dds的高频率分辨率、高频率精确度和高速频率捷变等优点，分别实现了系统所要求的高质量宽带本振源和小步长频率捷变；采用电调谐选频技术，则大大改善了接收机的选择性和抗干扰能力。 |
| 10. | In this system two oscillator are used for mixing . pll for high local oscillator and dds + pll for low local oscillator . by making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution , high frequency accuracy , very fast frequency hoping with it , the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step
系统采用两次混频，其中高本振的设计采用pll锁相环频率合成来实现，充分发挥了锁相环频率合成器的优良特性，实现了系统所要求的高质量宽频带本振源；低本振采用pll + dds频率合成来实现，结合pll优良的锁相特性与dds的高频率分辨率、高频率精确度等优点，实现了频率的小步进高精度合成。 |
