84 Keysight Infiniium MXR-Series Real-Time Oscilloscopes User's Guide
6 Testing Performance
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 μW, then Vin = (4.0*10-6 *
50 Ω)1/2 = 14.1 mVrms.
Record the RMS voltage in Table 11 of the Performance Test Record (Vin @
Max Freq column).
14 Press [Clear Display] on the oscilloscope and record the scope V rms reading in
Table 11 of the Performance Test Record (Vout @ Max Freq column).
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 Table 11 of the
Performance Test Record. To pass this test, this value must be greater than
-3.0 dB.
16 Change the scope setup as follows:
a Change the channel vertical scale to 10 mV/div.
b Reset the horizontal scale to 16 ns/div (to display 8 cycles of a 50 MHz
waveform).
17 Change the generator output as follows:
a Reset the generator frequency to 50 MHz.
b Change the amplitude to the value suggested for this scale setting in the
Nominal Generator Amplitude Settings table.
18 Repeat step 8, step 9, and step 10 to measure the reference gain at 50 MHz for
this scale.
19 Repeat step 11 through step 15 to measure the gain at maximum frequency for
this scale setting.
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