照度与我们的生活息息相关，照度的大小对我们的工作和生产都有很大的影响，如工业生产、办公室、金融工作场所等地的照度不足，连续工作会引起视觉疲劳，大大降低工作效率，所以有必要对以上场所利用照度计进行照度测量控制。目前市面上有不同的照度计，如目视照度计、光电照度计等，目视照度计使用不太方便，精度不高;光电照度计长时间工作仍能保持良好的稳定性且灵敏性高，使用比较多。不同的照度计有不同的适用场合，使用宏诚系列照度计，性能稳定，反应灵敏，且设计小巧，方便携带，多种类型照度计可满足大多的测量要求。
PV023R1K1T1NHCC
PV023R1K1T1VMMC
PV023R1K1T1WMRC
PV023R9K1T1NFWS
PV023R1K1JHNMMC
PV023R1K4T1NFHS
PV023R1L1T1NMMC
PV023R1K8T1VMMC
PV023R1K1T1NFRZ
PV023R9K1T1NMMC
PV023R1K4T1NMR1
PV023R1K1T1VFDS
PV023R1K8T1NMMC
PV023R1K8T1NFWS
PV023R1K1T1WMR1
PV023R1K8T1N001
PV023L1K1T1NMMC
PV023R1K4T1NMMC
PV023R1K1T1NKLC
PV023R1K4T1NFR1
PV023R1K1S1NFWS
PV023R1K1T1NFFC
PV023L1K1T1NFWS
PV023R1K1T1WFDS
PV023R1K1T1NFFP
PV023R1L1T1NF
PV023R1K1T1WMM1
PV023R1K1T1NHLC
PV023R1K1T1NMRZ
PV023R1K1T1NMRK
PV023R1K1T1WMMC
PV023R1K1T1NFF1
PV028R1K1T1N001
PV028R1K1T1N100
PV028R1K1T1NFDS
PV028R1K1T1NFR1
PV028R1K1T1NFHS
PV028R1K1T1NMMC
PV028R1K1T1NMM1
PV028R1K1T1NMRC
PV028R1K1T1NFWS
PV028R1K1T1NFRC
PV028R1K1T1NFF1
PV028R1K1T1WMM1
PV028R1K1T1WFR1
PV028R1K8T1NFWS
PV028R1K4T1NFR1
PV028R1K1T1VMMC
PV028R1K1T1NHCC
PV028R1K4T1NMMC
PV028R1K1T1NELC
PV028R1K1T1NHLC
PV028R1K8T1N001
PV028R1K1T1NF
PV028R9K1T1NFWS
PV028R9K1T1NMMC
PV028R1K1T1VFDS
PV028R1K1AYNMRZ
PV028R1K8T1NMMC
PV028R1K1T1NMRK
PV028R1K1T1NFFP
PV028L1K1T1NMMC
PV028R1K1T1NFRZ
PV028R1K1S1NFWS
PV028R1K1T1NMMZ
PV028R1K1T1NMR1
PV028R1K1T1NMFC
PV028R1K1T1WFDS
PV028L1K1T1NFWS
PV028R1K1JHNMMC
PV028R1K1T1NMRZ
PV028R1K4T1NFHS
PV028R1K1T1NMF1
PV028R1K1T1NGLC
PV028R1K1T1WMRC
PV028R1L1T1NMMC
PV028R1K1T1WMMC
PV028R1K1T1WMR1
PV028R1K8T1VMMC
PV028R1K1T1NFFC
PV028R1K1T1NMMK
PV028R1K4T1NMR1
PV032R1K1T1N001
PV032R1K1T1N100
PV032R1K1T1NFDS
PV032R1K1T1NFR1
PV032R1K1T1NFHS
PV032R1K1T1NMMC
PV032R1K1T1NMM1
PV032R1K1T1NMRC
PV032R1K1T1NFWS
PV032R1K1T1NFRC
PV032R1K1T1NFF1
PV032R1K1AYNMTZ
PV032R1K1T1NMFC
PV032R1K1T1NMR1
PV032R1K1T1NMF1
PV032R1K1T1NMRK
PV032R1K1T1NFFP
PV032R1K1T1WMMC
PV032R1K4T1NMMC
PV032R1K8T1VMMC
PV032R1K1T1WFR1
PV032R1K1T1NFFC
PV032R1K1JHNMMC
PV032R1K1T1WMRC
PV032R9K1T1NFWS
综上所述，对音频仪器设备的测试源的设计和选择有幅度可变、频率可调两个基本要求。通常的激励源只能做到单一的幅度可调(而频率不变)或者频率可调(而幅度不变)，没有二者皆同时可调，这样就导致了测试效率极低。为了提高测试效率，可以采用以正弦为载波包络按指数衰减的信号作为测试源。1原理及仿真1.1设计原理如所示，该信号为按指数衰减的正弦信号，即其包络为单边衰减的指数信号，包络内是按正弦载波振荡的。这样指数衰减的包络能反映出信号由大到小的变换规律，能满足放大性能动态范围的测试;而频率可调可以方便频率响应的测试。
