Keysight 8990B Service Guide
13
Zero set verification setup . . . . . . . . . . . . . . . . . . . . . .23
Equipment setup for low power verification . . . . . . . .26
Equipment setup for high power verification
Measured rise time percentage error versus signal-un-
der-test rise time . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Screenshot of the measurement reading from the
oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Rise and fall time verification setup . . . . . . . . . . . . . . .33
Timebase frequency accuracy verification setup
Impedance verification setup . . . . . . . . . . . . . . . . . . . .37
Offset accuracy verification setup . . . . . . . . . . . . . . . .40
DC gain verification setup . . . . . . . . . . . . . . . . . . . . . .44
Maximum frequency verification setup . . . . . . . . . . . .47
Check the backlight inverter voltages
Overview assembly of the 8990B . . . . . . . . . . . . . . . . .75
Front panel assembly . . . . . . . . . . . . . . . . . . . . . . . . . .76
. . . . . . . . . . . . . . . . . . . . . . . . .77
. . . . . . . . . . . . . . . . . .78
Rear mounting plate sub-assembly . . . . . . . . . . . . . . .79
. . . . . . . . . . . . . . . . . . . . . . . . .80
8990B module and support plate sub-assembly
Remove the T20 screws at the handle . . . . . . . . . . . . .97
Remove the T20 screws from the upper rear cover
Remove the T20 screws on the bottom rear cover
Lift up the rear cover . . . . . . . . . . . . . . . . . . . . . . . . . .99
Remove the nuts at the sensor connector and the N-type
connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Remove the 4 units of screws on both of the cable
shields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
Disengage the series of tabs . . . . . . . . . . . . . . . . . . .101
Pull the front panel bezel off . . . . . . . . . . . . . . . . . . .102
Unslot the N-type connector and release the two screws
N-type connector cover . . . . . . . . . . . . . . . . . . . . . . .103
Содержание 8990B
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