The PWM/PPM Generator converts analog input signals to Pulse Width Modulated (PWM) or Pulse Position Modulated (PPM) output signals. In PWM, an analog input signal is sampled, and a pulse whose width (duration) is proportional to the input signal amplitude is generated at each sample point.

In PPM, an analog input signal is sampled an a pulse whose position is proportional to the input signal amplitude is generated at each sample point. Both PWM and PPM signals are of constant height (amplitude), and the pulses in PPM signals are of constant width. Although PWM and PPM are more complex forms of message processing than PAM, they still are not considered true digital signals.

Using the PWM/PPM Generator, students can gain an understanding of how PWM and PPM signals are generated. The noise resistance characteristics of PWM/PPM signals can be studied also.

Specifications

Power Requirements: Connection to the Enclosure / Supply Regulator, Model 9420 (not included)

Audio Input
Voltage: 2 V p-p
Impedance: 600 Ω
Frequency Range: 300 Hz to 5 kHz

Ramp Input
Voltage: 2.2 V p-p
Impedance: 600 Ω
Maximal Frequency: 20 kHz

PWM / PPM Outputs
Voltage: 5 V TTL, (gain control at CAL position) 0-5 V variable
PPM Pulse Duration: 3 μS to 1 mS

Fault-Insertion Switches: 8
Test Points: 6

Physical Characteristics
Dimensions (H x W x D) 83 x 142 x 212 mm (3.3 x 5.6 x 8.3 in)
Net Weight 0.7 kg (1.5 lb)