Keysight Technologies Infiniium 90000A Series, Руководство по обслуживанию

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36 90000 A-Series Service Guide
3
Testing Performance
Record this value in the Calculated Gain @50 MHz column in the Analog
Bandwidth—Maximum Frequency Check section of the Performance Test
Record.
11
Change the generator frequency to the maximum value for the model being
tested as shown in the table below. It is not necessary to adjust the signal
amplitude at this point in the procedure.
12
Change the oscilloscope horizontal scale to the value for the model under test
in the preceding table.
13
Measure the input power to the oscilloscope channel at the maximum
frequency and convert this measurement to Volts RMS using the expression:
For example, if the power meter reading is 4.0 μ W, then Vin = (4.0*10
-6
*
50
Ω
)
1/2
= 14.1 mVrms.
Record the RMS voltage in the Analog Bandwidth—Maximum Frequency Check
section of the Performance Test Record (Vin @ Max Freq).
14
Press [Clear Display] on the oscilloscope and record the scope V rms reading in
the Analog Bandwidth—Maximum Frequency Check section of the Performance
Test Record (Vout @ Max Freq).
15
Calculate the gain at the maximum frequency using the expression:
Gain
50 MHz
V
out @50 MHz
V
in @50 MHz
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Setting Model
DSO90254A
DSA90254A
DSO90404A
DSA90404A
DSO90604A
DSA90604A
DSO90804A
DSA90804A
DSO91204A
DSA91204A
DSO91304A
DSA91304A
Maximum
Frequency
2.5 GHz 4.0 GHz 6.0 GHz 8 GHz 12 GHz
11.8 GHz at 5
mV/div
12 GHz
11.8 GHz at 5
mV/div
Scope Horizontal
Scale
100 ps/div 100 ps/div 100 ps/div 100 ps/div 100 ps/div 100 ps/div
V
in
P
meas
50
Ω ×
=
Gain
Max Freq
20 log
10
V
out Max Freq
( )
V
in Max Freq
( ) ⁄
Gain
50 MHz
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=