Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/~phil/hardware/powermeter/Notes Дата изменения: Wed Aug 24 20:16:09 2011 Дата индексирования: Sun Feb 3 21:03:20 2013 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п

product manual for pulse profiling application:

specs pg 8
freq range: 100Mhz to 8Ghz
;
calibration factor .. about 4%
linearity 3% to 7% depending on input power
noise: 1 sec integration:
100Mhz to 6Ghz .02%
.02% -30 to +20 dbm
.04% -50 to -30 dbm
;
video bandwidth
power measurements: 10Mhz
pulse profiling : 100 Khz
pulse profiling opt4 : 100 Khz,200khz,... 10Mhz

timebase +/- 50 ppm
effective samplerate: 48 MS/sec
measurements: 2000/sec

Actual sampling rate 500 Khz(2usec)? from programming manual pg 73.



page 27
-uses a repetitive under-sampling technique to reconstruct the input
signal. results in an effective sample rate of 48 MS/s.
- Signals with modulation bandwidths up to 10 MHz can be measured with
high degree of accuracy.
;
page 60.
-1 buffer takes .3 to 1.0 msecs to acquire
- somewhere else it says 250 usecs per buf.
-you then average buffers.

so 2000 averages .3 ms= .6 seconds is what we see for our readback times.
;
;programming guide:
- pg 73 "antialiasing"
- Normally the sampling rate is 500KHz. As baseband approaches the
Nyquist criteria (realistically about 200 Khz) problems arise...