Speed-Measuring Device Performance Specifications: Lidar Module

Speed-Measuring Device Performance Specifications: Lidar Module
circuit was open. The inductor's impedance, given by Z = Vrms/Irms with an applied sinewave
voltage, varied from 45.8 Ω at 200 Hz to 309 Ω at 10 kHz. Its inductance,
determined by L = Z/(2πf), varied from 36.4 mH at 200 Hz to 4.9 mH at 10 kHz. The
inductor used must have an impedance of at least 40 Ω over this frequency range.
4.14 FM Signal Generator
The FM signal generator shall be capable of producing 20 mW output power at
frequencies from 30 MHz to 500 MHz and shall have an audio frequency modulation
variable from 500 Hz to 5 kHz, a 50 Ω output impedance, a maximum standing-wave
ratio of 1.2, and a variable output level. It shall also have a deviation meter or calibrated
control for determining the peak frequency deviation with an uncertainty no greater than
10 %.
4.15 AM Signal Generator
The AM signal generator shall cover the 25 MHz to 30 MHz frequency range, be
capable of producing at least 20 mW output power with 99 % modulation depth over
frequencies from 500 Hz to 5 kHz, have a 50 Ω output impedance, and have a
maximum standing-wave ratio of 1.2. The generator should include a digital frequency
counter having an uncertainty no greater than 1 part in 10 6 and a monitor or calibrated
control for determining the modulation depth with an uncertainty no greater than 10 %.
If an integral frequency counter is not provided, a separate frequency counter having
the required accuracy shall be provided.
4.16 Line Impedance Stabilization Network (LISN)
The LISN, constructed as in figure 5, serves to couple the signal from the radiofrequency
signal generator into the power line of the UUT, while the UUT is also
receiving its power from the dc supply.
4.17 RF Power Meter
The power meter shall have 50 Ω feed-through detectors for measuring both the forward
and reflected power over a frequency range of 20 MHz to 500 MHz. It shall have the
ability to handle powers up to 50 mW with an uncertainty of no greater than 10 %.
4.18 Slide Whistle
The slide whistle, a wind instrument with a notched hollow tube and a variable
displacement, shall be capable of producing audio frequency notes form 500 Hz to 3
kHz.
4.19 Oscilloscope
A digital sampling oscilloscope (DSO) is required for routine setup and adjustment of
the simulator (see fig. 1) and for detailed verification that the simulator is working
Page 4-4 Test Equipment 6/12/04