Simulator Voltage Probe Reads Zero Volts

[Anonymous]

I'm a new EAGLE user with modest (at best) electronics knowledge. My first circuit I've tried to simulate in EAGLE is a common emitter amplifier. In my original schematic it seems to be working as expected (100mV signal amplified up to a couple of volts). However, with the addition of a capacitor-resistor filter on the output, the output voltage always reads zero. I have ensured that the OUTPUT voltage probe is connected to the right net, etc. Am I missing something here? I'm attaching an image showing the original schematic with the expected output graph and the modified schematic with the unexpected output graph.

Any ideas are welcome, thanks!

[jorge_garcia]

Hello @Anonymous,

I hope you're doing well. There are couple of things that could be going on. You may need to set an initial condition for that output capacitor or something is going on during the operating point calculation.

Try this, go into the simulation settings and look on the right side. There's an option called RSHUNT set to off, change it to ON. Let me know if there's anything else I can do for you.

Best Regards,

[Anonymous]

Hi Jorge!

Thanks so much for the reply. Per your suggestion, I set RSHUNT to ON. Unfortunately, that did not fix the issue. I appreciate your help, though!

-Brian

[jorge_garcia · Accepted solution]

Hi Brian,

OK, then try setting an initial condition. See the attached picture for how to do this. Give the capacitor and initial voltage as an attribute like the picture shows.

Let me know if you run into any problems.

Best Regards,

[Anonymous]

You nailed it, Jorge. Works like a champ.

Thanks again!

-Brian

[verivolt_seo]

If a simulator voltage probe is reading zero volts, there could be several possible reasons for this issue. Here are a few things you can check:

1. Connection: Ensure that the voltage probe is properly connected to the circuit or component you are measuring. Check the wiring and connections to make sure there are no loose or disconnected wires.

2. Voltage source: Verify that there is an actual voltage source present in the circuit. If the circuit or component you are measuring does not have any voltage applied to it, the voltage probe will read zero volts.

3. Probe settings: Double-check the settings and range of the voltage probe. Make sure that the probe is set to the appropriate voltage range for the expected voltage in your circuit. Adjust the probe settings if necessary.

4. Calibration: Confirm that the voltage probe is calibrated correctly. Some simulators or measurement devices require periodic calibration to maintain accuracy. Refer to the documentation or user manual for instructions on how to calibrate the probe if needed.