Products > Test Equipment
looking for spectrum analyzer / network analyzer with 1MOhm Input Choice
Andree Henkel:
High, I´m working as electronic designer at a company designing/building LASERs, mainly used for Microscopy.
We are looking for a spectrum- / networkanalyzer to help in design / test / specification testing of the Lasers and theyr electronics.
Main task will be Laser intensity noise measurement.
We want to do
*determine RMS values of the noise say from 10Hz to 1MHz or 10MHz
*look for lines in the light spectra, to work towards spectral pure laser light sources
*measure inside the electronics to reduce / eliminate spur lines, originating for instance from DC/DC-Converters
*reduce the broadbandnoise of the LASER / its driving electronis
We look for recommendations for Analyzer with 1MOhm Input- additional to a 50Ohm Input, which would allow to measure directly in Circuit, we have 38MHz 1:1 1MOhm Scope Probes from R&S
Or with prebiased photodetektor and termination resistor (for noise measurement at a 15mW Laser and 10MHz Bandwidth typicallly 1kOhm Shunt)
Suitable devices seem HP3588A ; HP3589A ; Anritsu MS4630A
Requirements:
*below 50Hz, so we would find line interference (50Hz is line frrequency in Europe)
*better dow to 10Hz, so we could do Noise measurement starting at 10Hz
*higher than 10MHz is must for the noise / interferece measurement
*the diode type lasers often employ a HF-Modulation somewhere 75MHz to 175MHz; typically at 125MHz to prevent them from Mode-Hopping (frequency-Hopping in Laserfrequency); so upper Frequency of 150MHz, better 200MHz would be nice
*low average displayed noise level
*digital interface (GPIB will do, we have spare USB/GPIB adapters araund)
*tracking generator would be nice, so we could measure frequency response of laser-power control circuit, laser current control circuit, photodetector circuit
*Phase measurement ability would be nice to have phase information for the frequency response of the circuitry above
sorry, got a litttle long.
chris_leyson:
HP3585A/B has 1Mrg 75 02 50 Ohm input, 20Hz to 40Mhz, 3Hz lowest RBW plus tracking gen output. Also reasonably low phase noise. Trouble is that model is probably nearly 40 years old.
Andree Henkel:
thanks, yes 3585A / 3585B was my original search result, starting with that I found the 3588/3589 and the Anritsu
nctnico:
The Anritsu MS4630B is also a good option. The big question is: what is your budget?
PartialDischarge:
I’ve got the 3589A, great device, like it so much that i got a 3588a just to get spares in case the 3589a breaks. Schematics are available at artekmanuals too
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