Specifications

Chapter 3: Testing Performance
Analog Bandwidth -- Maximum Frequency Test
35
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 scope time base to the value for the model under test in the table above.
13 Measure the input power to the scope 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 μW, then Vin = (4.0*10
-6
* 50Ω)
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 scope 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:
For example, if (Vout @ Max Frequency) = 13.825 mV, (Vin @ Max Frequency) = 13.461
mV and Gain @ 50MHz = 1.0023, then:
Record this value in the Calculated Gain @Max Freq column in the Analog Bandwidth
- Maximum Frequency Check section of the Performance Test Record. To pass this test,
this value must be greater than - 3.0 dB.
Setting Model
MSO/DSO/DSAX
91304A
MSO/DSO/DSAX
91604A
MSO/DSO/DSAX
92004A
MSO/DSO/DSAX
92504A
Maximum
Frequency
13 GHz 16 GHz 20 GHz 25 GHz
Scope Time
Base Setting
50 ps/div 50 ps/div 50 ps/div 50 ps/div
Model
MSO/DSO/DSAX
92804A
DSO/DSA 93004L MSO/DSO/DSAX
93204A
Maximum
Frequency
28 GHz 30 GHz 32 GHz
Scope Time
Base Setting
50 ps/div 50 ps/div 50 ps/div
Click here and enter time
base value from table
V
in
P
meas
50Ω×=
Gain
Max Freq
20 log
10
V
out Max Freq
()V
in Max Freq
()⁄
Gain
50 MHz
------------------------------------------------------------------------------
=
Gain
Max Freq
20 log
10
13.825 mV 13.461 mV ⁄
1.0023
-------------------------------------------------------------
0.212 dB==