Atec Anristu-MA2400A Series - Manual (Page 2)

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MICROWAVE COMPONENTS
13
High accuracy diode sensors
The Anritsu MA2440A series high-accuracy diode sensors have a
built in 3 dB attenuator to minimize input SWR. They are used where
the best measurement accuracy is required over a large dynamic
range, for example when measuring amplifiers. High accuracy diode
sensors have a dynamic range of 87 dB compared to the 90 dB of
standard diode sensors.
Fast diode sensors
The MA2460A fast diode sensors from Anritsu have a rise time of
0.6 µs. This, together with a sensor video bandwidth of 1.25 MHz,
makes them the ideal solution for power measurements on
N-CDMA (IS-95) signals. The MA2460 sensors must be used with
the ML2407/08A power meter. This combination of meter and sensor
provides fast signal processing and sampling speeds. Average pow-
er, peak power and crest factor on N-CDMA signals can be mea-
sured and displayed. The MA2460 are dual diode sensors that de-
liver a greater-than 80 dB dynamic range, which makes them suit-
able for both open- and closed-loop power-control testing. The sen-
sors internal AC detection circuitry gives a guaranteed noise floor of
–60 dBm with typical performance to –70 dBm, even when measur-
ing CDMA signals.
INPUT DET B -ve
DET B +ve
DET A -ve
DET A +ve
6dB
Power
Divider
Detector
‘C’
11dB
Pad
6dB
Power
Divider
Detector
‘B’
17dB
Pad
Detector
‘A
DET C -ve
DET C +ve
RF
Pulses down to 1 µs can also be captured and displayed, thanks to
the sensor rise time of 0.6 µs. In profile mode the ML2407A meter
can be used to measure average power across narrow pulses, an in-
creasingly common test method for amplifiers in digitally modulated
systems.
Universal power sensors
The new MA2480A series Universal Power Sensors will measure
any modulated or multi-tone signal, thanks to a patented sensor ar-
chitecture with three diode pairs (see fig. 3). Universal power sen-
sors deliver over 80 dB of dynamic range with speed and accuracy.
Average power measurements on WCDMA signals can now be
made without the need for special power meters. Universal sensors
are also ideal for power measurements on other digitally modulated
carriers such as HDTV, DAB or QAM modulated radio links.
Universal power sensors are also ideal for applications where multi-
ple signals are present, such as intermodulation measurements and
satellite multi carrier power loading measurements.
Anritsu universal power sensors have a unique additional capability
for performing as a standard diode sensor for CW measurements. In
this mode the fast response of diode sensors is maintained across
the full dynamic range of the sensor, meaning that for the majority of
users it is the only sensor that they will ever need – a truly Universal
Power Sensor.
Fig. 3 Universal Power Sensor