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5-7 POWER SWEEP, TWO
TONE
This measurement module has three variations of possible Measurement
Types: Power Sweep (single frequency), Multi Frequency Power Sweep,
Gain and IMD.
Single Frequency
Power Sweep
Procedure.
Prepare the ME7840A as shown in Chapter 3.
Enter the appropriate test values in the displayed
User Input screen. The input fields are described
below:
n
Measurement Type: Drop down options showing
Power Sweep (single frequency), Multi Freq Power
Sweep (uses 3 frequencies), Gain & IMD. Set to
“Power Sweep ” for this test.
n
Main Tone (MHz): CW Frequency setting for
source 1.
n
Offset (kHz): Offset frequency for Source 2
(Source 2 will be set to Main Tone + Offset).
n
Start Power (dBm): Power will be swept starting
at the start power (input RF power to AUT). Both
sources are simultaneously set to each power set-
ting. The stop power is also entered in the “to”
window.
n
Data Points: Number of data points in power
sweep.
n
Increment Power (dBm): Value to increment
power for each data point (calculated and dis
-
played only).
n
Source Attn (dB):Value of Source attenuation, be
-
tween 0 and -70 (calculated and displayed only).
n
Drain Current Checkbox: When checked the
drain current is measured and power added effi
-
ciency is calculated and displayed.
n
PStop Level (dB):Provides the ability to set the
PStop value based on the level of gain compres
-
sion. Drop down options include compression levels
of 1 dB through 10 dB in 1 dB increments, and
OFF. If OFF is selected, then the P Stop equals the
value entered in the “to” window above. If the se
-
lected compression occurs, PStop for all subse
-
quent power sweeps is reset to one increment be
-
fore the P
in
value where this compression level is
reached.
S-PARAMETERS OPERATIONS, MEASUREMENT
5-10 ME 7840A OMM