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1-9 SYSTEM
DESCRIPTION
Brief descriptions of the DRA Scorpion (MS462XC) and MS4782X Test
Set are given below.
DRA Scorpion The Scorpion Direct Receiver Access (DRA) version Vector Network Mea-
surement System (VNMS) (Figure 1-2) functions under control of the soft-
ware residing in the PC through GPIB commands. The software supports
tuning and alignment operations by generating real time graphic displays
of the measured data on the PC screen.
Under software control, 3
rd
,5
th
and 7
th
order IMD products can be mea-
sured and displayed. Also, the Upper and Lower Side Band (USB & LSB)
components of the IMD products are measured and displayed separately.
The DRA Scorpion includes the following capabilities:
q
Two internal, independent RF sources. Each source has a range of
–15 dBm to +10 dBm. A 0dB to 70dB step attenuator (10 dB / step)
is provided for each source resulting in a Power Output range of
–85 dBm to +10 dBm from each source.
q
Complete built-in capability for IMD measurements. A combiner is
provided in the Test Set.
q
Internal Transfer Switch enabling S
22
and Hot S
22
measurements.
The reflectometer set-up is provided in the Test Set.
q
Direct access to each of the four receiver channels (two reference
channels and two test channels) for maximum flexibility in measur
-
ing forward and reverse S-parameters over a wide range of AUT
output power. The Test Set provides incident and reflected signal
separation.
GENERAL INFORMATION SYSTEM DESCRIPTION
ME7840A OMM 1-5
NOTE
After test set losses, the maximum net power at the input of the amplifier
under test (AUT) is +5 dBm.
Model
Frequency Range
(MHz)
Max AUT Power Output
(Watts)
Reverse Measurements
(S
22
, Hot S
22
,S
12
Possible)
Circulator
(at AUT Output Path)
MS4782A 800 to 1000 50 Yes Internal
MS4782D 800 to 2400
(Note 1)
100
(Note 2)
Yes External
Notes:
1. This frequency range does not account for any restricting effects caused by use of external circulator.
2. This Max AUT power assumes a minimum isolation of 23 dB provided by external circulator(s). Two circulators may have to
be used to provide the required isolation.
Table 1-1. Test Set Configurations