Step 6.
When ready for measurements, cautiously apply DC power to
the AUT.
Step 7.
Check that the normally factory-installed RF coaxial “jumper”
cable is installed on the rear panel of the Test Set:
n
MS4782X: Between Ext Preamp Input and Output
connectors.
n
MS4782D: Between connectors C1 and C2, unless a
circulator is installed.
Step 8.
If drain current and/or PAE measurements are desired, the
optional current probe (ANRITSU part number 2000-1067 or
-1085) can be used. Ensure the probe (Figure 3-1) has a fresh
battery, and set the zero offset using the MS4623C as follows:
a.
Using
Domain
softkey, set to Transmission & Reflec-
tion; using the
Display
soft key, set for Single Channel;
using the
Graph Type
softkey, set for Real; using the
Scale
softkey and
Data Entry
keys, set for 1 mU/Division.
Use the
Avg
key and associated softkeys to set Aver-
aging for 10 and IF Bandwidth for 300 Hz. Use the
Config
key, DATA POINTS and associated softkeys to
set for 101 Max Data Points.
b.
Use the
Measure
softkey and select Ext. Analog In.
c.
Turn on the current probe and set it for the desired
range.
d.
Adjust the “Zero Adjustment” thumbwheel until the
reading is minimum (typically 0
±
100
m
U).
e.
On the current probe:
Orient the probe such that the “Current Direction”
arrow points away from the power supply.
Place the jaws only over the DC wire (not both wires)..
Unused Connections
The EXT. SOURCE and AUX. OUT connectors must be terminated with
50
W
terminations when not in use.
PREPARING THE SYSTEM
OPERATIONS, GENERAL
3-2
ME 7840A OMM
Summary of Contents for ME7840A
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