AF10 – PWM generator

for laboratory and test stand use

AF10: AF 10 PWM Generator Prüfstand autonomes Laborgerät

The AF10 is a highly flexible PWM generator for laboratory and test stand use.

Its output operates in a voltage range from 3 to 24 V and is low-resistance, so that it can deliver currents up to 1 A. This distinguishes it significantly from conventional function gen­erators. If the output power of up to 24 W is insufficient, it can be increased to higher output voltages and currents using power modules available as an option.

The interface to external power modules is disclosed and documented, so that the user can very easily develop and operate his own modules.

A ramp function makes it possible to output freely programmable PWM traces, whose duty cycle, frequency and amplitude can rampbe modulated. A detailed description of this func­tion is given in a separate article:
Advanced ramp functions

For test stand operation, the AF10 has further essential characteristics besides the ramp function:

  • Optional 8/24 open drain outputs to control 8/24 test pieces
  • Galvanically separated SPS interface for remote control of the duty cycle
  • Optional galvanically separated RS232 interface for remote control of duty cycle, frequency and voltage
  • Restart of the last function after an interruption in power supply
  • . . .

In laboratory operation the AF10 can be used for the most varied development and analysis scenarios. An incomplete list of possible use scenarios is given in the following separate article:
Application examples for the AF10 PWM generator

Based on the AF10 we develop customized PWM generators and laboratory devices to control for example actuators, solenoid valves, active chassis components, electromagnets, or also any other applications.


  • Frequency range: 0.1 Hz to 1 MHz
  • Duty cycle: 0 % to 100 %
    (-100 % to +100 % for external H-bridge)
    Resolution: 0.1 % / 5.95 ns
  • On PC programmable ramp functions of duty cycle, frequency and voltage – data transfer via USB stick
  • Generates up to 6 phase locked control signals for external power modules
  • Large display for
    • Status view
    • Setup
    • Graphic display of PWM signals (oscilloscope mode)
  • Adjustable language for user interface
  • Power supply with large input voltage range:
    100 VAC to 250 VAC 50/60 Hz,
    130 VDC to 350 VDC
  • Selectable push-pull and open drain output
    • Output current up to 1 A
    • Adjustable output voltage: 3 V to 24 V
    • Short-circuit and overvoltage protection
    • Reverse current sink capability (e.g. motor brake)
  • TTL output 3.3 V/5 V
  • Extension port
    • 4 outputs for controlling external modules such as half and full bridge
    • 2 outputs for controlling the active rectification of full bridge converters
    • Programmable timing features (dead-time, delays, . . .)
    • 1 analog input to adjust the duty cycle via external control
  • Galvanically isolated PLC interface
    • Analog input (0 to 5 V) for external control of duty cycle
    • 6 digital inputs to choose from up to 63 stored duty cycles
    • Start/stop input control of ramp function
  • RS232 Interface (option)
    • Remote control of duty cycle, frequency and output voltage
    • Switching On and Off the PWM output
    • Update rate up to 1 kHz
    • Readback of actual PWM settings

Customer-specific options include:

  • External power modules of different topology, voltage and power ranges
  • Dithering function to eliminate mechanical hysteresis (e.g. for linear valve control)
  • Configurable PID controller, feedback via analog input
  • Software controller, control feedback via analog input
Versions     Basic     Automation Engineering
Push-pull output 3 V to 24 V/1 A X X X
Open drain output X X X
Short-circuit and overvoltage protection X X X
TTL output 3.3 V/5 V X X X
Frequency range: 0.1 Hz to 1 MHz X X X
Reverse current sink capability
(e.g. engine brake)
Ramp function

Generate PWM traces in Excel and transfer via USB stick


Galvanically isolated PLC interface
6 digital inputs for selecting duty cycles X X
1 digital input to control the ramp function X X
1 analog input to control the duty cycle X X
1 TTL PWM output (5 V) X X
1 analog output (0 to 5 V, 0% to 100% duty cycle) X X

Extension port
6 phase linked PWM channels (TTL) X
High-side switch mode X
Low-side switch  mode X
2 half bridge modes (for motor control ±100%) X
Full bridge mode (forward converter) X
Full bridge mode (forward converter) + active rectifier X
12 V driver supply X
Analog feedback channel (0 V to 5 V) X

8 Open drain PWM outputs
30 V/100 mA
500 kHz max
RS232 interface for remote control of the AF10 X X

HBM II – external half bridge module 60 V / 16 A

FBM6020 – external full bridge module 60 V / 20A