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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:-
The 1250A together with a potentiostat such as the model 1287A, can be used in a wide range of applications, including:-
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
| 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) | |||
