Atec MA2400A User Manual
MICRO WAVE COMPONENTS
504 For product ordering information, see pages 5 –12
POWERSENSORS
MA2400A/B Series
10 MHz to 50 GHz
The MA2400A/B Series Power Sensors consist of MA247XA Series
Power Sensors, MA246XA/B Series Power Sensors, MA248XA
Series Universal Pow er Sensors, MA242XA/B Series Thermal Po wer
Sensors, and MA244XA Series High Accuracy Power Sensors.
These units are broadband microwave measurement components.
All models except the MA246XA/B Series Power Sensors, are used
with the ML2430A Series Power Meters. The MA246XA/B Series
Power Sensors are used only with the ML2400A Series P o wer Meter .
Features
• 10 MHz to 50 GHz range
• N, K, and V type RF connectors
• 90 dB dynamic range provides stable power readings to –70 dBm
• MA244XA Series High Accuracy Power Sensors contain an additional matching circuit to improve return loss performance
• MA242XA/B Series Thermal Power Sensors provide measuring
speeds to 4 ms rise and fall times in addition to exceptional return
loss performance
• MA246XB power sensors have fast 1 millisecond rise and f all times
needed for CDMA measurements
• MA248XA Universal sensors measure average power of modulated signals such as W-CDMA, multi-tone, etc.
• All MA2400A/B Series Power Sensors contain internal EEPROMs
for storage of calibration data as a function of frequency, power,
and temperature. This allows the power meter to interpolate and
correct readings automatically
Fast thermal sensors
Anritsu’s thermal sensors provide excellent power measurement accuracy over 50 dB of dynamic range with more speed than any other thermal sensor available (see fig. 1). Thermal sensors use
Seebeck elements where the combined effect of a thermal gradient
and charge migration between dissimilar metals gives a true reading
of average power on an y incident w a v eform. Anritsu thermal sensors
have class-leading SWR and built in EEPR OM with calibration factor
and linearity correction data. This results in assured accuracy
when measuring any signal. Anritsu’s fast thermal power sensors
improve sensor rise time and fall time to less than 4.0ms– an order of magnitude faster than previous thermal sensors. Settled
power measurements are now 10 times faster; that means reduced test time.
Standard diode sensors
Diode sensors have greater speed, sensitivity and dynamic range
than thermal sensors (see fig. 2). All Anritsu diode sensors use a
dual diode architecture that gives improved sensitivity and dynamic
range over single diode architectures. The MA2470A Series Power
Sensors 90 dB dynamic range is both fast and accurate. Linearity is
better than 1.8%, typically < 1.0% through 18 GHz.
MA2470A power sensors offer an ideal combination of speed and
dynamic range for general purpose power measurements. A single
sensor replaces the two sensors that were previously required with
sensors limited to 50 dB dynamic range.
MA2472A
MA2475A
Fig. 1 Fast Thermal Sensors
Fig. 2 Standard Diode Sensors
1000
-30
Pin
MA242XA Series
Thermal Sensors
Traditional
Thermal Sensor
-20
-10
0
10
20
100
10
Rdgs/sec
1
0.1
-70
-60
-50
-40
100000
10000
1000
100
Rdgs/sec
MA2470A, Sampling Rate
MA2470A, Reading Rate
MA2470A, GPIB Continuous
Auto-Averaged Readings
10
1
0.1
-70
-60
-50
Traditional
Diode Sensor
-40
-30
Pin
-20
Traditional
Thermal Sensor
0
-10
10
20
http://www.anritsu.com 505
MICRO WAVE 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 measur ing 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 power, peak power and crest factor on N-CDMA signals can be measured and displayed. The MA2460 are dual diode sensors that deliver a greater-than 80 dB dynamic range, which makes them suitable for both open- and closed-loop power-control testing. The sensors internal AC detection circuitry gives a guaranteed noise floor of
–60 dBm with typical performance to –70 dBm, even when measuring 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 narro w pulses , an increasingly 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 architecture with three diode pairs (see fig. 3). Universal power sensors 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 multiple 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
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