Agilent Technologies 2000 X-Series Service Manual page 52

2 Testing Performance
52
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.
4 Set the signal generator for 1 MHz and six divisions of
amplitude.
The signal on the oscilloscope screen should be about five
cycles at six divisions amplitude.
5 Set up the Amplitude measurement
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.
6 Note the oscilloscope AC RMS - FS(1) reading at the
bottom of the screen. (This is the RMS value with any dc
offset removed.)
7 Set the power meter Cal Factor % to the 1 MHz value on
the calibration chart on the power sensor.
8 Note the reading on the power meter and covert to Vrms
using the expression:
Vin = Pmeas
1MHz
For example, if the power meter reading is 892 uW, then
Vin = (892*10
1MHz
50
1MHz
- 6 1/2
* 50 ) = 211.2 mV
2000/3000 X-Series Oscilloscopes Service Guide
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rms