Agilent Technologies 6000 Series Service Manual page 44

2 Testing Performance
44
3 Set up the oscilloscope.
a Press the Save/Recall key, then press the Default Setup
softkey.
b Press the Acquire key, then press the Realtime softkey to
unselect Realtime.
c Set channel 1 Coupling to DC.
d On 300 MHz, 500 MHz, and 1 GHz models only, set channel
1 Imped to 50 Ohm.
e Set the time base to 500 ns/div.
f Set the Volts/Div for channel 1 to 200 mV/div.
g Press the Acquire key, then press the Averaging softkey.
h 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 Quick Meas key.
b Press the Clear Meas softkey.
c Press the Select: softkey and use the Entry knob to select
Std Deviation within the select menu.
d Press the Measure Std Dev softkey.
6 Note the oscilloscope Std Dev(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:
=
Pmeas
Vin
1
MHz
For example, if the power meter reading is 892 uW, then
Vin = (892*10
1MHz
× Ω
50
1MHz
-6 1/2
* 50Ω) = 211.2 mV
6000 Series Oscilloscopes Service Guide
.
rms