Agilent Technologies E4418B - Making Measurements

Performance Tests
Output Standing Wave Ratio (SWR) Test
Agilent E4418B/E4419B Service Guide 2-27
17.Round off the DVM reading to two decimal places. Record this value as
V
1
:
•V
1
___________
18.Turn the power reference off:
Press , , .
19.Disconnect the DVM negative input lead from the V
RF
connector on the
Agilent 432A. Reconnect it to the Agilent 432A chassis ground.
20.Observe the reading on the DVM. Record this value as V
comp
•V
comp
___________
21.Calculate the power measured from the power reference oscillator
using equation 2-9:
Equation 2-9:
22.Record the value P
1
:
•P
1
___________
23.Calculate the power measured with mount resistance set to 100Ω:
•Set the Agilent 432A mount resistance switch to 100Ω.
•Connect the equipment as shown in Figure 2-7 ensuring that the
DVM input leads are isolated from chassis ground.
•Repeat steps 15 to 20. Record the new values of V
0
, V
1
and V
comp
:
◆ V
0
___________
◆ V
1
___________
◆ V
comp
___________
24.Calculate the power measured from the power reference oscillator
using Equation 2-10 and record the value:
Equation 2-10
•P
2
___________
System
Inputs
More
Power Ref Off
Where:
P
1
2.V
comp
V
1
V
0
–()V
0
2
V
1
2
–+
4.R
1
------- ------------------------------------------ ------------- ----------------=
Where:
P
2
2.V
comp
V
1
V
0
–()V
0
2
V
1
2
–+
4.R
2
-------- ------------------------------------------- ------------- --------------=
4402serv.book Page 27 Tuesday, October 14, 2003 3:18 PM