Atec Rohde-Schwarz-SML03 - Manual (Page 4)

4 Signal Generator ¸SML
Servicing:
robust, compact, lightweight
Mobility
The ¸SML is lightweight and com-
pact and therefore very easy to transport.
Flexible control
In service environments, an IEC/IEEE
interface is not always available for con-
trolling the generator. This is no problem
for the ¸SML since it can also be
driven via a standard RS-232-C interface.
Protection against overvoltage
The integrated overvoltage protection of
the RF input protects the ¸SML
against very high external voltages such
as may occur during transceiver measure-
ments.
Production:
fast, accurate, reliable
Accuracy
Measurement uncertainty can be split
into the part from the instrument and that
introduced by the test setup. With lower
uncertainty of the generator, greater tol-
erances can be allowed for the setup. If
the low level deviation of the analyzer is
used to allow for higher DUT tolerances,
the result will be a marked reduction in
manufacturing rejects – an advantage
that pays off immediately.
Speed
Speed is of prime importance in produc-
tion. And this is precisely one of the
strong points of the ¸SML, with a
setting time of <10 ms for frequency and
level.
Reliability
A signal generator used in production
must have high reliability. The ¸SML
meets this requirement for example
through the use of a completely wear-
free electronic attenuator. Should a fault
nevertheless occur, the continuous self-
diagnostics of the ¸SML prevent
expensive erroneous measurements.
Output level
In production test systems, the signal is
taken to the DUT (device under test) via
switches and cables, thus leading to level
losses. These losses can be easily com-
pensated by the high output power of the
¸SML.
Dimensions
Space is often at a premium in produc-
tion. The compact size of the ¸SML
makes it ideal for use in such environ-
ments.
Example: component test
◆ To obtain reliable information on com-
ponent quality, high level accuracy
and precise reproducibility of the out-
put level are called for. The ¸SML
fully meets these requirements owing
to the level deviation of <0.5 dB
(at levels >
−120 dBm) and high
reproducibility.
◆
With unrivalled short times (<10 ms)
for frequency and level setting, the
¸SML enables fast testing and is
ideal for use in production.
◆ Overshoots in case of level change
may damage or destroy the DUT. This
cannot happen with the ¸SML
since it operates without any over-
shoots.
EMS measurements
Non-interrupting level setting without
overshoots
EMS measurements call for non-
interrupting level setting, which should
moreover be performed without any over-
shoots. The ¸SML operates free of
overshoots and offers a wide dynamic
range of typ. 30 dB for non-interrupting
level variation (with Attenuator Mode
Fixed).
Typical SSB noise at 1 GHz (with OCXO option ¸SML-B1).
–150
–145
–140
–135
–130
–125
–120
–115
100 1000 3300 10
Phase
noise
in
dBc
(1
Hz)
Frequency in MHz
50 500
Typical SSB phase noise versus carrier frequency (carrier offset 20 kHz);
dashed line: Extended Divider Range mode.