Agilent Technologies DSO80204B, Service Manual

Page: 53 / 161

Chapter 4: Testing Performance
DC Gain Accuracy Test
52
6
Change the Aux Out voltage to -15 mV.
7
Press the Clear Display key on the scope, wait for the #Avgs value to return to 256 and
then record the DMM voltage reading and the scope V avg reading in the DC Gain Test
section of the Performance Test Record.
8
Repeat step 7 for the remaining vertical sensitivities for channel 1 shown in the DC
Gain Test section of the Performance Test Record.
9
Press Default Setup, then turn off channel 1 and turn channel 2 display on.
10
Set the Aux Out voltage (V
Aux Out
) to +15 mV as follows:
11
Configure the scope to measure V avg on Channel 2.
a Pull down the Utilities menu and select Acquisition. When the Acquisition Setup window
is displayed, enable averaging and set the # of averages to 256.
b Change the vertical sensitivity of channel 2 to 5 mV/div.
c Click the V avg measurement icon on the left side of the screen.
d When the Enter Measurement Info window is displayed, ensure that the Vavg function
is set up as follows and then click OK:
Source = Channel 2
Measurement area = Entire Display
12
Press the Clear Display key on the scope, wait for the #Avgs value to return to 256 and
then record the DMM voltage reading and the scope V avg reading in the DC Gain Test
section of the Performance Test Record.
13
Repeat step 12 for the remaining vertical sensitivities for channel 2 in the DC Gain
section of the Performance Test Record.
14
Repeat steps 9 through 13 for channels 3 and 4.
Record the
mean reading