Agilent Technologies 85037A, Operating And Service Manual

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Operator's Check
See \Characterizing the Detector" in this c hapter for a pro cedure
that allo ws y ou to quic kly c hec k the detector. This pro cedure can b e
used as a daily c hec k.
Operating Modes
and Specifications
The Agilent 85037 series precision detectors ha v e built-in corrections
for b oth frequency range and dynamic accuracy . These corrections
are used to enhance the measuremen t capabilit y of the detector. The
follo wing text explains ho w the corrections are made. Additional
information regarding detector op eration is a v ailable in the 8757D
Sc alar Network A nalyzer Op er ating Manual .
Dynamic Accuracy
The dynamic accuracy and absolute p o w er accuracy of the detector is
measured at the factory . Appro ximately 150 correction constan ts are
then calculated and stored in the EEPR OM of eac h detector. This
pro vides a default correction and is sucien t to guarantee the default
dynamic accuracy sp ecications. T o obtain maximum p erformance,
the detector m ust b e connected to the 50 MHz calibrator output
of the 8757D Option 002 and then c haracterized using the built-in
correction routine in the 8757D. Once this is done, the detector will
meet the enhanced (corrected) sp ecication for dynamic accuracy for
b oth A C and DC measuremen ts. This c haracterization will remain
v alid un til the detector is unplugged. F or optimal p erformance
ho w ev er, the detector m ust b e rec haracterized if its temp erature
c hanges b y more than 65 C.
Frequency Response
The 85037 uses built-in correction factors to pro vide the b est p ossible
frequency resp onse. The n um b er of correction factors will v ary
with eac h detector, but is t ypically 25. These correction factors are
determined at the factory and are stored within the EEPR OM of the
detector. If the 8757D is used with the system in terface, then the
analyzer will automatically determine the prop er correction factor to
use; no user in terv en tion is required. If the 8757 system in terface
is not b eing used, then the frequency related correction factors
will b e determined from the start/stop lab els. These lab els can b e
en tered in to the 8757 b y pressing 4
SYSTEM
5
NNNNNNNNNNNNNNNNNNNN
LABELS
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
START LABEL (or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
STOP LABEL ) and then en tering the start (or stop) frequency .
Operation 3-3