✅ MSO5000 Live Monitor — Power Analysis Setup Checklist DC

🧪 For Shunt-Based DC Power Measurements (Low-Side Current Sensing)

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🧰 Hardware Assumptions

• DC power supply (e.g., 40V / 3.5A)
• Shunt resistor on the negative rail (e.g., R010 = 0.01Ω)
• Voltage measurement: CH2
• Shunt voltage measurement: CH3

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🛠 Oscilloscope Setup (on RIGOL MSO5000)

CH2 — Voltage Channel

• Connect to the positive side of your load or power supply
• Set unit: VOLT
• Set probe: 10X (or 1X, depending on your probe type)
• Enable 20 MHz BW Limit ✅

CH3 — Shunt Voltage (Current)

• Connect across the shunt resistor (GND/negative side)
• Set unit: VOLT ⚠️ (not AMP!)
• Set probe: 1X (unless using attenuated probe or amp clamp)
• Enable Invert if waveform is upside down
• Enable 20 MHz BW Limit ✅

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⚙️ Live Monitor: Power Analysis Tab Setup

Field	Value / Action	Why
Voltage Ch	2	CH2 measures supply/load voltage
Current Ch	3	CH3 connected across shunt
Correction Factor	1.0	Leave as-is unless doing manual calibration
Current Probe Type	Shunt ✅	Required for converting volts → amps
Probe Value (Ω)	0.01 for R010	Your shunt's resistance
Expected P (W)	(Optional) e.g. 250 → hit ⚙ Cal	Auto-tune if you know expected power
DC Offset	✅ Check if signal has DC baseline drift	Improves PF and FFT accuracy
25M [v]/[i]	❌ Leave off unless needed	Only enable for high-resolution waveform fetches
➤ ⚡ Measure	Click to run power analysis	You’re done ✅

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🧾 Cross-Check (Recommended)

• ✅ Does Real Power ≈ Voltage × Current from your DC supply?
• ✅ Is Irms ~ what your shunt should show?
• ✅ Does PF or phase angle make sense for your load?

Use 📈 Plot Last to visualize your PQ triangle.

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⚠️ Important: Rigol PQ Will Be Wrong

Rigol’s Power Quality feature assumes CH3 is already in Amps.
If you're measuring shunt voltage, Rigol will report 100× too little power.

📌 Only Live Monitor properly scales shunt measurements.

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🏁 Quick Reference Table

Signal	CH	Scope Unit	GUI Probe Type	Probe Value
Voltage (V)	2	VOLT	—	—
Shunt Voltage	3	VOLT	Shunt	0.01
Current Clamp	3	VOLT	Clamp	e.g. 1000
Current Direct	3	AMP	Clamp	e.g. 1.0

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🧠 Still confused? If Rigol says “2.5W” and Live Monitor says “250W” — the latter is correct.