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Options
GHz Module
5
5-7
Porch
Rising edge
< 150ps
Amplitude from
porch to top ~
250mV
yu005.eps
Figure 5-2. Fast Edge Full Wave Form
The fast edge testing procedure uses the following equipment:
•
A Tektronix TDS 820 with 8 GHz bandwidth option or a Tektronix 11801 with an
SD 26 module
•
3 ½ DMM.
•
It is suggested that an extender card be used during adjustment.
Use the following steps to test and adjust the circuits on A92:
1.
Remove the GHz module and remove the machined cover over the A92 module.
2.
Before the adjustment, check that the resistance measured across the tunnel diode
(CR21) is between 2
Ω
and 5
Ω
. If this measurement is less than 2
Ω
or more than
5
Ω
, the tunnel diode may be damaged.
3.
Install the GHz module on the extender board.
4.
Connect the trigger signal from A55 to the trigger input,
J2 - SMB, on the A92 board.
5.
Connect a scope to the GHz signal output connector, J4 –SMA.
6.
Apply power. No other cables need to be attached.
7.
Set the 5820A edge function to “fast edge on” via the front panel.
8.
Adjust the oscilloscope vertical offset so that the porch level is centered in the
display screen. See Figure 5-3.
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