I am dealing with E4405b Spectrum Analyzer (SA), here at faculty lab. Unfortunately there is a lack of help here so I have to ask you a few things.
I want to set my SA to trigger at certain power level, for example, I am monitoring spectrum that is 1MHZ arround 868.65MHz center frequency, and I am expecting my transmitter to send some signal at some point in time. The SA should trigger as soon as it detects given power level in that spectrum, and to freeze picture (something like single sequence with oscilloscopes). I was working once with 50kg high end spectrum analyzer and those kind of measurements were set-up in a 10 seconds, but here se kind of complicated or it is even not posible.
Thank you, something like this could help, but I still cannot believe that this spectrum analyzer doesn't have this feature already integrateed. It is completely useless in todays applications when you want to catch some burst in undetermined moment in time. Does anybody have any experience with this machine?
The Digital demodulation board set of option B7D and B7E will provide an internal burst trigger. In fact, it provides a key under the Trig menu that lists RF Burst. This trigger option allows the analyzer to be triggered by an RF burst envelope signal. The trigger level can be set to either a level relative to the peak of the burst or to an absolute value. This board set (B7D/B7E) can be retrofitted into an ESA, but there may be other options to consider.
Options to consider:
• B7D, DSP board
• B7E, RF Downconverter
• 1D5, Precision frequency reference
• B72, Expanded Memory
• 1D6, Time Gating (for analyzing time varying signals)
our spectrum analyzer has B7E option and appropriate firmware version (I am not able to recall precise version now). But I still don't understand what really means B7E and simmilar modules.
Under trigger menu, there is an option RF burst, but obviousely, I wasn't able to set up scope correctly in order to have adequate measurements.
I set center frequency to 2.4GHz because we have wireless router near the spectrum analyzer, and in the free run I was able to se wifi signal in the display, and to figure order of absolute power. In the next step, I set RF burst as trigger, and put appropriate power level as a trigger treshold, but SA (spectrum analyzer) wasn't triggerred at all. Then I lowered trigger level, ant SA started to trigger when that level was at the same level as noise. I don't know why it happened in this way, and thus there is a question, whether I should use normal input for those kind of measurements, or some of the inputs from mentioned modules at the back of SA.