Agilent Technologies Infiniium 90000 A Service Manual page 38

Chapter 3: Testing Performance
Analog Bandwidth - Maximum Frequency Check
f When the RMS voltage measurement setup window is displayed, configure this
measurement as follows:
Source = Channel 1
Measurement Area = Entire Display
RMS Type = AC
Set the generator to apply a 50 MHz sine wave with a peak-to-peak amplitude of about
7
4 divisions.
• Use the following table to determine the approximate required signal amplitude.
The amplitude values in the table below are not absolutely required. If your generator is
unable to produce the recommended amplitude, then set the generator to the highest
value that does not produce a vertically clipped signal on the scope.
Table 3-1. Nominal Generator Amplitude Settings
Scope
Vertical Sensitivity
5 mV/div
10 mV/div
20 mV/div
50 mV/div
100 mV/div
200 mV/div
500 mV/div
1 V/div
Measure the input power to the scope channel and convert this measurement to Volts
8
RMS using the expression:
=
V P
in meas
For example, if the power meter reading is 4.0 μW, then Vin = (4.0*10
Record the RMS voltage in the Analog Bandwidth - Maximum Frequency Check section of the
Performance Test Record (Vin @ 50 MHz).
38
Generator Signal Generator Signal
Amplitude (Vp-p) Amplitude (dBm)
0.02 -30
0.04 -24
0.08 -18
0.20 -10
0.40 -4
0.80 +2
2.0 +10
4.0 +16
×
50Ω
-6 1/2
* 50Ω) = 14.1 mVrms.