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The B&K Precision 4084 is a 20 MHz DDS (direct digital synthesis) function generator that creates stable, accurate output signals for all 27 built-in standard and complex (arbitrary) waveforms. The generators produce high purity, low distortion sine waves, square waves up to 20 MHz and provide a stable output of very small signals down to the 1mV - 10mV range. The instrument also provides a built-in 100 MHz universal counter with frequency measurement and totalize function. It provides extensive modulation capabilities including AM, FM, FSK, PSK, pulse modulation and linear/logarithmic sweep. Internal and external modulation sources, as well as internal, external and gated trigger sources are supported. Modulation parameters can be set precisely and are adjustable over a wide range. For instance burst count is programmable in 1 burst increments up to 10000 bursts and burst phase is adjustable in 0.1° increments. Adjust parameters via knob or numeric keypad. Enter amplitude values directly in Vpp, mVpp, Vrms, mVrms or dBm and display the correct voltage by entering the actual output configuration used (terminated with 50 Ohm or open circuit). It is fully programmable via the standard RS232 interface, using SCPI commands. Specifications. Frequency Range: 1 µHz to 20 MHz (Sine, Square), 1 µHz to 100 kHz (All Other waveforms). Resolution: 1 µHz. Accuracy: <= ± 5x10^-6 (22°C ±5°C). Amplitude Range: Freq <= 20MHz: 2mV to 20Vpp (open circuit) , 1mV to 10Vpp (50 ohms). Amplitude Resolution: 2 µVpp (open circuit), 1 µVpp (50 ohms). Amplitude Accuracy: ± 1%+0.2 mV (sine wave relative to 1 kHz). AM Carrier Waveforms: Sine or Square. AM Internal Modulating Waveform: Sine, Square, Triangle, Rising/Falling Ramp. AM Frequency of modulating signal: 100 µHz to 20 kHz. FM Carrier Waveforms: Sine or Square. FM Internal Modulating Waveform: Sine, Square, Triangle, Rising/Falling Ramp. FM Frequency of modulating signal: 100 µHz to 10 kHz. Counter Frequency Measurement: 1 Hz to 100 MHz. Storage Parameters: frequency, amplitude, waveform, DC offset values, modulation parameters. Storage Capacity: 10 user configurable stored states.
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