Chapter 3: Testing Performance
To test bandwidth
47
To test bandwidth
This test checks the bandwidth of the oscilloscope.
Specification
Equipment Required
Equivalent Time Test
1
Connect the equipment.
a With the N cable, connect the signal generator to the power splitter input. Connect
the power sensor to one output of the power splitter.
b With an N- to- BNC adapter, connect the other splitter output to the channel 1
input.
2
Press Default Setup to set the oscilloscope to default conditions.
3 Select Acquisition from the Setup menu. Select Equivalent Time sampling mode.
Enable averaging and set the # of Averages to 32. Select Close.
4 Set the vertical scale for Channel 1 to 100 mV/div using the knob. Select 50Ω
input impedance.
5 Set the sweep speed to 50 ns/div using the horizontal sweep speed knob.
6 Set the signal generator for 10 MHz at +5.0 dBm.
The signal on the oscilloscope screen should be about five cycles at six divisions
amplitude.
7
Select V
amptd
from the Voltage submenu of the Measure menu.
8 After the measurement settles (when averaging is complete, about 10 seconds),
note the V
amptd (1)
reading at the bottom of the screen. V
10MHz
=__________________mV.
9 If using an 8482A Power Meter/Sensor, ensure that the power sensor calibration
factors are loaded into the appropriate table of the E4418B Power Meter and
that the table is turned on.
Equivalent Time Real Time
MSO/DSO8064A DC to ≥600 MHz MSO/DSO8064A DC to ≥600 MHz
MSO/DSO8104A DC to ≥1 GHz MSO/DSO8104A DC to ≥1 GHz
Equipment Critical Specifications Recommended Model/Part
Signal Generator 1—1 GHz at ≈200 mVrms Keysight 8656B/8648A
Power Meter/Sensor 1—1 GHz ±3% accuracy Keysight E4418B/8482A
Power Splitter outputs differ by <±0.15 dB Keysight 11667A
Cable Type N (m) 24 inch Keysight 11500B
Adapter Type N (m) to BNC (m) Keysight 1250-0082
Bandwidth Check Limits
Do not exceed 6 divisions when making the bandwidth check.
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