Viavi 87339, Operation Manual

Page: 108 / 198

Testing
5 -9
5.2.6.B Diagnostics Function Window
Selecting Diagnostics from the Maintenance sub-menu will display the Diagnostics
Function Window. The Diagnostics Function Window provides control for generating test
signals, with specific power and frequency parameters.
Fig. 5-5 Diagnostics Function Window
Control Component Description
Mode
Drop down selections:
OFF - Diagnostics output disabled and simulation is allowed.
CW - Diagnostics output enabled, output is CW and simulation
is locked.
MODULATED - Diagnostics output enabled, output is
modulated GPS signal and simulation is locked.
Frequency Drop down selections: 1176.45 MHz, 1207.14 MHz, 1227.60
MHz, 1278.75 MHz or 1575.42 MHz.
Amplitude
Numeric pad: Power in dBm. Range -93 dBm to +155 dBm
DIRECT or -68 dBm to -130 dBm COUPLER
Doppler Error Numeric Pad: +/- 5000Hz in 1 Hz increments.
EXT REF OUT
Drop down selections: ON or OFF.
Reference Sources Drop down selections: INT or EXT.
LOG AMP
Displays the output from the internal up convertor module.
Displayed in dB.
Read Reads the output from the internal up convertor module.
PLL Lock Status
Indicates the state of the LO, 800 Mhz, EXT. REF and EXT.
REF DET. ON (Green) indicates locked condition, OFF (Gray)
indicates unlocked condition.