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Performance Tests
Model 11869A
4-10.
CW and Manual Gate
a.
To test the ? ? CW AND MAN GATE''
signal interface, perform the
Residual FM test in CW mode as described in the Operating and
Service Manual of the RF Plug-In in use. If the T*CW AND MAN GATE''
signal from the 11869A is not correct, excessive residual FM noise
will be present.
4-11.
Multiband Operation (86290 Only)
a.
This test verifies that the sweep is stopped at the bandswitch
points to enable a change to the next band. This test is performed
only on the 86290A/B/C. Connect the equipment as shown in Figure
4-1, with the 1740A Oscilloscope in A vs B mode.
(If a different
model oscilloscope is used, externally sweep the scope with the
8350A SWEEP OUTPUT.) On the 8350A select a START frequency of 2 GHz,
a STOP frequency of 18 GHz, and a fast sweep time. Set the 86290 for
maximum leveled output power.
If one or more of the bands has no
power,
suspect Output Latch U9 or Inverter U11A.
b.
If the band changing circuit is functioning correctly,
bright spots
of amplified intensity will appear at the bandswitch points
(6.0 -
6.2 GHz and 12.0 - 12.4 GHz).
If proper band switching does not
occur,
suspect the SEQ SYNC or L SSRQ
(stop sweep request)
signals
from the 11869A Adapter.
OSCILLOSCOPE
SWEEP
RF
OSCILLATOR
PLUG-IN
4-2
Figure 4-1.
Test Setup for Mulliband Operation
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