Agilent N5181A/82A MXG Signal Generators User’s Guide 143
Troubleshooting
RF Output
RF Output
No RF Output
• Check the RF ON/OFF LED (shown on page 3). If it is off, press RF On/Off to turn the output on.
• Ensure that the amplitude is set within the signal generator’s range.
• If the instrument is playing a waveform, ensure that marker polarity and routing settings are
correct (see “Saving Marker Polarity and Routing Settings” on page 83).
Power Supply Shuts Down
If the power supply does not work, it requires repair or replacement. If you are unable to service the
instrument, send the signal generator to an Agilent service center for repair (see page 151).
No Modulation at the RF Output
Check both the Mod On/Off LED and the <modulation> Off On softkey, and ensure that both are on.
See also, page 34.
For digital modulation on a vector signal generator, ensure that the internal I/Q modulator is on (the
I/Q annunciator displays).
If using an external modulation source, ensure that the external source is on and that it is operating
within the signal generator’s specified limits.
RF Output Power too Low
•If the AMPLITUDE area of the display shows the OFFS indicator, eliminate the offset:
Press Amptd > More (1 of 2) > Amptd Offset > 0 > dB. See also, “Setting an Output Offset” on page 49.
•If the AMPLITUDE area of the display shows the REF indicator, turn off the reference mode:
1. Press Amptd > More > Amptd Ref Off On until Off highlights.
2. Reset the output power to the desired level.
See also, “Setting an Output Reference” on page 50.
• If you are using the signal generator with an external mixer, see page 144.
• If you are using the signal generator with a spectrum analyzer, see page 144.
• If pulse modulation is on, turn off the ALC, and check that pulse width is within specifications.
Distortion
If you edit and resave a segment in a waveform sequence, the sequence does not automatically
update the RMS value stored in it’s header. This can cause distortion on the output signal. Display
the sequence header information and recalculate the RMS value (see page 78).
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