[Alt-photo] 365 nm. UV-Densitometer. part 6 of 7
e.camerling at tiscali.nl
Tue Dec 10 09:38:20 UTC 2013
For reading the optical density ( D ) you can use a digital volt meter (
One of the most luxury DVM's is the Lascar DPM 300 , a 4.5 digit single
At www.rs-online.nl , search for nr 260--038 you can see the data.
Price : EUR 172.= incl VAT !! For me much too expensive !
So I used a much cheaper DVM ( data : input R = 100 M ohm
accuracy = 0.1% ± 1 digit
range = 2000 counts
resolution = 0.1 mV )
power supply = 9 -12 V
that was in my "old stuff" box. Now I can measure from D = 0.10 to 3.50
But I could lent a Voltcraft VC 175 DMM (autorange) with 4000 counts
that meter I could measure from D = 0.100 to 3.500.
Price : EUR 33.= incl.VAT look at www.conrad.nl and search nr:
for an example.Because of its size is will be very difficult to build in
but you can use it for a lot of other measurements when you connect
the meter with a cord to the densitometer. For the accuracy you don't need
the VC 175 because the delta D = ± 0.02 for the densitometer.
To be continued this week
More information about the Alt-photo-process-list