Anritsu ME7840A - Manual (Page 36)

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
±100mU).
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