(A) Overview FPF type frequency transmitter, using the latest electronic circuitry to produce a standard quartz crystal frequency, the difference between the input frequency converted into a DC analog after comparing power output. Using a quartz crystal and drift-free digital circuits, so that the frequency transmitter, high accuracy, good temperature performance, stable and reliable. DC output proportional to the input of the transmitter are measured frequency change can be accurately measured to 50Hz, 60Hz is the center frequency of the frequency offset. And capable of high resolution frequency measurements within a narrow frequency range. The transmitter input and output specifications for customers to have more choice, and indicating instruments and other devices with the convenience RTU. (B) the type and specifications: FPF --- frequency transmitter (Fig. 2) Accuracy: 0.2% Specifications: Vn: Frequency range Bn Fn auxiliary power Pn On: analog output voltage range of 30-600V F1 50Hz B1 ± 0.5Hz B2 ± 1Hz P1 AC 110V PD1 DC 110V 01 0-1mA 02 0-20mA 03 4-20mA 04 0-5mA 05 0-10mA F2 60Hz B3 ± 2Hz ??B4 ± 5Hz P2 AC220V PD2 DC220V 07 0-1V 08 0 -5V 09 0-10V F3 400Hz B5 ± 10Hz B6 consumption 3.5 VA 010 2-10V 011 1-5V 013 designated Note: .FPF positive full-scale output range of 0 to positive full-scale output can fill 013, and indicate the full value; for example 1.FPF-F1-P2-08 / B2 frequency transmitter input: 49-51Hz Auxiliary Power: AC 220V output: 0-5V / 49-51Hz cases 2.FPF-F1-P2-013 / B3 -5V-0V- + 5V output frequency transmitter input: 48-52Hz Auxiliary Power: AC 220V output: -5V-0V- + 5V / 48-50-52Hz