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--- hardware:hardware.dbbc.power_measure [2012/03/29 02:29]
Stuart Weston created
+++ hardware:hardware.dbbc.power_measure [2012/03/29 02:55]
Stuart Weston
@@ Line 2: / Line 2: @@
 === New Zealand DBBC 09/06/2011 ===
-Testing of DBBC power measurement device reveals that it has a %red%logarithmic output response!!%black%.
-%red%Update:13/6/2011: Logarithmic response verified, 37 mV/dB according to data sheet %black%Attach:HMC610LP4-datasheet.pdf
+Testing of DBBC power measurement device reveals that it has a **logarithmic output response**!!
+Update:13/6/2011: Logarithmic response verified, 37 mV/dB according to data sheet {{:hardware:hmc610lp4-datasheet.pdf|}}
 Presumably the DC output from this chip is sampled by an ADC. Would not think it likely that this (ADC) has significantly non linear behaviour. Conclude that the numbers provided by DBBC are proportional to power in dB
-See attached spreadsheet and notes below;
+See attached spreadsheet and notes below:
+{{:hardware:linearity-test-jun-2011.xls|}}
+{{:hardware:linearity-test-jun-2011-1.xls|}}
+{{:hardware:dbbc-linearity.jpg|}}
-Attach:linearity-test-jun-2011.xls
+We have used this to modify antcn in the Field System so that the DBBC can be used to provide power measurements for "fivept", "onoff" and "acquire". We have thus used for pointing which can be used by the Field System pointing model.
-Attach:dbbc-linearity.jpg
+I'll attach the FS s/w for this in due course.