Amprobe 38XR-A User Manual page 21

Measuring Dutycycle
1. Set the Function Switch to %.
2. If Hz is displayed, press the yellow button to display %.
3. Connect the Test Leads: Red to %, Black to COM.
4. Connect the Test Probes to the signal source.
5. Read the display.
Measuring dBm
The 38XR-A measures dBm relative to 1 mW referenced to 50 Ω.
That is, 10 dBm = 10 mW, 0 dBm = 1 mW, -10 dBm = 0.1 mW, etc.
1. Set the Function Switch to k.
2. Press the yellow button. The display shows dBm to verify
the selection.
3. Connect the Test Leads: Red to E, Black to COM.
4. Connect the Test Probes to the signal source.
5. Read the display.
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