英国(tti)数字频率计TF930：
Frequency, period, pulse width, frequency ratio
duty cycle, and event counter modes
DC to 3000MHz range, 0.001mHz resolution
High impedance measurement up to 125 MHz
英国(tti)数字频率计TF930的技术说明：
Frequency, period, pulse width, frequency ratio
duty cycle, and event counter modes
DC to 3000MHz range, 0.001mHz resolution
High impedance measurement up to 125 MHz
TF930 - 3GHz Universal Frequency Counter
Frequency, period, pulse width, frequency ratio
duty cycle, and event counter modes
DC to 3000MHz range, 0.001mHz resolution
High impedance measurement up to 125 MHz
AC or DC coupling, 1M/50Ohm selection, polarity invert
Switchable attenuator, threshold control
Noise filter for low frequency measurements
Selectable measurement time; display hold function
Large 10 digit display with full range of annunciators
Internal rechargeable batteries for portable use
USB interface provides full remote control and readback
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