Model 1250A Frequency Response Analyzer
The model 1250A Frequency Response Analyzer (FRA) delivers
accurate measurement of gain and phase. The device under test is
stimulated by a sinewave and the response analyzed at one, two or
more points in the system. These responses are then correlated with
the stimulus to determine the amplitude and phase relative to the
generator. The ratio of the two measured signals can then be used to
provide the system transfer function.
This process rejects all harmonics and, by increasing the
integration time, even signals which are buried in noise can be
measured accurately.
The 300 V range on the 1250A is particularly useful for
making measurements on fuel cell stacks and high voltage batteries,
used in hybrid vehicles and residential power supplies. Key product
features include:-
- AC amplitude range - 10 mV to 10 V, for power supply
testing
- Analyzer range 30 mV - 300 V, i.e. suitable for ATS
(Automated Test Systems), power station vibration testing
- Noise rejection capability
- Synchronizer option enabling generator and carrier signals to
be locked in terms of frequency / phase
- Ability to analyze non-linear systems
- Front panel or software (Visual Basic) control
- Modulator / demodulator card option for interfacing to AC
carrier systems
Electrochemistry
Measurement of impedance has become an important tool in the
study of electrochemical/biological phenomena and material
properties.
The 1250A together with a potentiostat such as the model 1287A,
can be used in a wide range of applications, including:-
- Corrosion and inhibitor studies
- Analysis of organic and inorganic coatings and films
- Research into solid electrolytes for oxygen sensors/fuel cells
- Development of novel anode/cathode materials and electrolytes
- Bioanalytical research into plant/soil properties
Materials Testing
When combined with a 1296 Dielectric Interface and temperature
test equipment the 1250A can be used to test a wide range of
materials, such as:-
- Supercapacitor/battery/fuel cell materials
- Charge transport in semiconductors, organic crystals, ceramics
etc.
- Analysis of chemical reactions, polymerization and curing
processes
- Novel gas and liquid sensors
- Characterization of ferro/piezoelectric and semiconductor
materials
Control Systems
A standard use for a FRA is to generate a signal which is
connected to a signal converter (this may take many forms; e.g.
hydraulic, pneumatic or electrical), which forces controlled
movement to take place (e.g. displacement transducers used in
aerodynamic tests). These are placed on the system under test and
the output signal fed back to the FRA via a sensor, enabling the
system to be characterized. Typical uses include:-
- Automated test systems
- Power supply testing
- Aircraft instrumentation/system controls
- Aerodynamic tests - study of applied forces to wing structures
- Car shock absorbers
- Weapons guidance systems
- Rocket propulsion and vectoring technology
Synchronizer
The synchronizer option enables the generator to be locked to a
rotating / reciprocating component, and measurements can then
be made relative to this. Applications include turbine analysis -
using harmonics to enable crack detection.
Modulator / Demodulator
This optional card allows the user to superimpose an external
modulator signal onto the 1250 generator signal which acts as a
carrier. This modulation signal can then be demodulated through the
analyzer inputs. Applications include telecommunications and
automated test systems.
If computer-only operation is required, consider the model
1250B
Specifications
| Generator |
|
|
Waveform |
Sine, square or
triangle |
|
|
Amplitude |
10 mV to 10.23 V
rms |
|
|
Maximum AC resolution |
10 mV |
|
|
DC Bias Range |
±10.23 V |
|
|
Maximum DC resolution |
10 mV |
|
|
Output impedance |
50 Ω±1% |
|
|
Max output current |
±100 mA peak |
|
Frequency range |
10 µHz to 65 kHz |
|
Max resolution |
10 µHz |
|
Error: |
±100 ppm |
|
Distortion |
<2% |
|
Stability |
24 hrs ±1ºC |
|
|
±10 ppm |
|
Sweep types |
Frequency
(logarithmic or linear) |
|
|
Amplitude (linear) |
|
|
DC bias (linear) |
|
Resolution |
|
|
frequency |
>10000 points |
|
amplitude |
>200 points |
|
Maximum voltage hi to
lo |
±46 V peak |
|
Maximum voltage lo to
ground |
150 V peak |
|
Maximum current |
±100 mA peak |
|
Impedance lo to ground |
100 kΩ // 100 pF |
|
Connectors |
Single BNC, floating
shield |
|
Front |
floating, 4mm |
|
Rear |
floating, BNC |
|
Protection |
Output is
short-circuit protected |
| Analyzers |
|
| Two independent
analyzers operating in parallel |
|
Range |
Dynamic range |
FS Peak Input |
Common Mode Rejection |
|
30 mV |
1 µV (90 dB) |
45 mV |
30 V |
|
300 mV |
10 µV (90 dB) |
500 mV |
30 V |
|
3 V |
100 µV (90 dB) |
5 V |
30 V |
|
30 V |
1 mV (90dB) |
50 V |
500 V |
|
300 V |
10 mV |
500 V |
500 V |
|
Inputs protected to |
±500 V (300 V
rms), hi or lo to ground |
|
|
Coupling |
DC or AC (< -1 dB
at 2.5 Hz) |
|
|
Input impedance hi or
lo to ground |
1 MΩ, <35 pF |
|
|
Cross-channel
isolation @ < 10 kHz |
>100 dB
(1kΩ across inputs) |
|
Measurement delay |
0 to 105 s |
|
| Displayed
Results |
|
|
Variable |
Frequency, AC
amplitude, DC bias |
|
Measured parameters |
Voltage gain, phase,
real, imaginary, Z, R, X, Y, G, B, V, I group delay, C, L,
Q, D |
| Interfaces |
|
|
RS232 & GPIB
(IEEE-488) |
For instrument
control or for directly driving attached plotter using HPGL
language |
| Power Requirements |
|
|
Voltage |
90 to 127V, 188 to
265 VAC |
|
Frequency |
45 to 440 Hz |
|
Power |
< 210 VA |
| Dimensions |
|
|
Width |
432 mm
(17") |
|
Depth |
573 mm (22.56
") |
|
Height |
176 mm
(6.93") |
| Weight |
18 kg (40 lbs) |
| Operating
Temperature Range |
0 to 50ºC (32 to 122ºF) |
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Advanced Measurement Technology
is
a trademark of AMETEK, Inc.