GW Instek GSP-810 Software Manual - Manual (Page 3)

Copyright©2003 GOODWILL Instrument CO., LTD.
(c) When the converting ends, the following windows will show up. Click “OK” to quit.
(d) The test.txt file contains the date and time of when making the SPF file, center frequency,
RBW, reference level, span and 501 points of data. Since it is the record of measurement, therefore
more then one measured data could be stored. It dependents on how long the trace records. In this
case, there are four groups of data.
5. Point Data
The Point data is 10 bits DAC value. Equation for converting DAC value to dBm reading is as
follow.
Ref.Level
DAC
reading
dBm
+ × 





− =
80 1
023 , 1
For example, the point data is 942, reference level is –20 dBm, the reading of the point in dBm is
) ( 33 . 26 20 33 . 6 ) 20 ( 80 1
023 , 1
942
dBm
− = − − = − + × 





−
2003.05.12
Date
Time
Ref.
level
RBW
Center
Freq. Span 501 points data
2nd
3rd
4th