Keysight Technologies InfiniiVision 2000 Service Manual page 42

2
Testing Performance
2 Set up the power meter.
3 Set up the oscilloscope.
4 Set the signal generator for 1 MHz and six divisions of amplitude.
5 Set up the Amplitude measurement
6 Note the oscilloscope AC RMS - FS(1) reading at the bottom of the screen.
7 Note the oscilloscope Std Dev(1) reading at the bottom of the screen. (This will
8 Set the power meter Cal Factor % to the 1 MHz value on the calibration chart
9 Note the reading on the power meter and covert to Vrms using the expression:
42
Set the power meter to display measurements in units of watts.
a Press the [Defaul t Setup] key.
b Set channel 1 Coupling to DC.
c With 2000 X-Series oscilloscopes, connect a 50 ohm feedthrough
termination.
With 3000 X-Series oscilloscopes, set channel 1 Imped to 50 Ohm.
d Set the time base to 500 ns/div.
e Set the Volts/Div for channel 1 to 200 mV/div.
f Press the [Acquire] key, then press the Averaging softkey.
g Turn the Entry knob to set # Avgs to 8 averages.
The signal on the oscilloscope screen should be about five cycles at six
divisions amplitude.
a Press the [Meas] key.
b Press the Clear Meas softkey and then the Clear All softkey.
c Press the Type: softkey and use the Entry knob to select AC RMS - Full Screen
(Std Deviation) within the select menu.
d Press the Add Measurement softkey.
(This is the RMS value with any dc offset removed.)
be used in later calculations.)
on the power sensor.
Vin = Pmeas
1MHz
For example, if the power meter reading is 892 uW, then Vin
1/2
50Ω) = 211.2 mV
rms
×
50Ω
1MHz
.
2000/3000 X-Series Oscilloscopes Service Guide
-6
= (892*10 *
1MHz