N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

TroubleshootingDisplayDisplayThe Display is Too Dark to ReadBoth brightness and contrast may be set to minimum. Use the figure in “Display Settings” on page 26to locate the brightness and contrast softkeys and adjust their values so that you can see the display.The Display Turns Black when Using USB MediaRemoving the USB media when the instrument begins to use it can cause the screen to go black.Cycle instrument power.Signal Generator Lock–Up• Ensure that the signal generator is not in remote mode (the R annunciator shows on the display).To exit remote mode and unlock the front panel, press Local Cancel/(Esc).• Ensure that the signal generator is not in local lockout, which prevents front panel operation. Forinformation on local lockout, refer to the Programming Guide.• If a progress bar appears on the signal generator display, an operation is in progress.• Preset the signal generator.• Cycle power on the signal generator.RF OutputNo RF Output• Check the RF ON/OFF LED (shown on page 5). 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 arecorrect (see “Saving Marker Polarity and Routing Settings” on page 156).Power Supply Shuts DownIf the power supply does not work, it requires repair or replacement. If you are unable to service theinstrument, send the signal generator to an Agilent service center for repair (see “Contacting AgilentTechnologies” on page 326).No Modulation at the RF OutputCheck both the Mod On/Off LED and the Off On softkey, and ensure that both are on.See also “Modulating the Carrier Signal” on page 61.For digital modulation on a vector signal generator, ensure that the internal I/Q modulator is on (theI/Q annunciator displays).If using an external modulation source, ensure that the external source is on and that it is operatingwithin the signal generator’s specified limits.316 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide