To Test Bandwidth - HP 54520 Series Service Manual

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To test bandwidth
To test bandwidth
This test checks the bandwidth of the oscilloscope.
Specification
Repetitive (all models) dc to 2500 MHz (equivalent time)
Real Time
HP 54520A dec to 2125 MHz
HP 54540A dc to 2125 MHz (3 or 4 CH on), de to 2250 MHz (1 or 2 GH on)
HP 54522A and 54542A dc to 2500 MHz
Equipment Required
Equipment Critical Specifications Recommended
Model/Part
Signal Generator 1—500 MHz at ~200 mVrms HP 8656B
Power Meter/Sensor 1-—-500 MHz +3% accuracy HP 436A/8482A
Power Splitter outputs differ by <0.15 dB HP 11667A,
Cable Type N (m) 24 inch HP 11500B
Adapter Type N (m) to BNC (m) HP 1250-0082
Repetitive Test
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.
Press Recall ,thenpress clr tosetthe oscilloscope to default conditions.
Set the following parameters.
Menu (hardkey) Function/Parameter Setting
Vertical {channel keys) (sensitivity) 100 mV/div
(all channels) (input R) 50Q pc
Horizontal (time/div) 200 ns/div
(Setup) (mode) repetitive
Display (mode) avg
# of avg 32
(graticule} grid
Entry Fine (on)
Set the signal generator for 1 MHz at +5.0 dBm. The signal on the screen should be
about two cycles at six divisions amplitude.
Note: Do not exceed 6 divisions when making the bandwidth check.
Initiate a V amptd measurement. ,
Press (blue) , V amptd ,and 1 (channel number, entry menu).
After the measurement settles (averaging complete, about 10 seconds) note the
Vamp (1) reading (bottom of screen): Vimuz = mv.
Set the power meter Cal Factor % to 1 MHz value from the cal chart on the probe.
Then press dB[REF] to set a 0 dB reference.
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