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lab_electrical_engineering:duty_cycle_adjustment [2026/06/17 12:55] – mexleadminlab_electrical_engineering:duty_cycle_adjustment [2026/06/17 14:22] (current) – mexleadmin
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 =====Duty Cycle Adjustment===== =====Duty Cycle Adjustment=====
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 ====Background Information==== ====Background Information====
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 To analyze how to adjust the duty cycle of the PWM-signal, the following circuit is used:\\  To analyze how to adjust the duty cycle of the PWM-signal, the following circuit is used:\\ 
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 <wrap left> <wrap left>
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 ~~CLEARFIX~~ ~~CLEARFIX~~
  
-  - Build the circuit on the MEXLE-board. Connect channel 1 of the oscilloscope to TR and channel 2 to SQ. The duty cycle can be adjusted using R1. Perform the measurements for the minimum, maximum, and midpoint duty-cycle settings with the capacitances **C1 = 10nF** and **C1 = 1nF**. Sketch the oscilloscope screen for each case. \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ **C1 = 10 nF, minimum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ ~~CLEARFIX~~ \\ **C1 = 10 nF, maximum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$~~CLEARFIX~~ \\ **C1 = 10 nF, middle position**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$~~CLEARFIX~~ \\ **C1 = 1 nF, minimum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$~~CLEARFIX~~ \\ **C1 = 1 nF, maximum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$~~CLEARFIX~~ \\ **C1 = 1 nF, middle position**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ ~~CLEARFIX~~ \\+  - Build the circuit on the MEXLE-board. Connect channel 1 of the oscilloscope to TR and channel 2 to SQ. The duty cycle can be adjusted using R1. Perform the measurements for the minimum, maximum, and midpoint duty-cycle settings with the capacitances **C1 = 10nF** and **C1 = 1nF**. Sketch the oscilloscope screen for each case. \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\  
 +**C1 = 10 nF, minimum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ ~~CLEARFIX~~ 
 +\\ **C1 = 10 nF, maximum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ 
 +~~CLEARFIX~~  
 +\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ 
 +\\ **C1 = 10 nF, middle position**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ 
 +~~CLEARFIX~~  
 +\\ **C1 = 1 nF, minimum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ 
 +~~CLEARFIX~~  
 +\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ 
 +\\ **C1 = 1 nF, maximum duty cycle**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$ 
 +~~CLEARFIX~~  
 +\\ **C1 = 1 nF, middle position**\\ \\ <wrap left>{{drawio>oscilloscope_screen.svg}}</wrap>\\ \\ \\ Channel 1: $\frac {Volt}{Div}=$\\ \\ Channel 2: $\frac {Volt}{Div}=$\\ \\ \\ Time basis: $\frac {T}{Div}=$  
 +~~CLEARFIX~~  
 +\\ \\ \\ \\ \\ \\ \\
   - Explain how this circuit works in a few sentences. \\  \\  \\  \\  \\  \\  \\  \\  \\  \\    - Explain how this circuit works in a few sentences. \\  \\  \\  \\  \\  \\  \\  \\  \\  \\ 
  
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 ====Test Questions - Integrator==== ====Test Questions - Integrator====
 </WRAP> </WRAP>
 +~~PAGEBREAK~~