I'm trying TIA mode individual gain setting and measuring when PD output current is 0uA (connecting Photo Diode but no light)
Settings outline is following,
SLOTA ch1: 25k ch2: 200k
ADC OFFSET: ch1:0 ch2: 0
(discribe this "setting1")
but output value is strange like fllowings:
1. ch2 output is always 0.
2. ch1 output is different from that of setting2: (SLOTA ch1: 25k ch2: 25k)
output was about 3600 when setting 1 but over 4000 when setting2.
I tried several times but the result was same.)
according to formula(11), in any gain settings, output values must be about 3100.
I mean that PD current calculation formula (11) of each channel is affected by the other channel's gain setting. why?
here, output of ch1 and ch2 when setting1
the register settings are followings
(address 1byte and value 2bytes. Formart is like your .dcfg file)
00 080001 00FF02 000506 070009 00C810 000011 301912 014014 055515 000018 000019 00001A 00001B 00001E 00001F 000020 000021 000022 103023 103224 303225 044030 071931 0113 34 030035 071936 101338 000039 21403B 21403C 300642 1CFB43 AE6544 1CFB45 AE654B 269A4D 005E4E 00404F 20D050 004054 002055 030C // setting2: 030F58 00005A 00005F 0000