By deST on Tuesday, September 3, 2002 - 01:33 pm:
I have a DAD-Detector but the baseline is not stable:
1)I don't have bubbles.
2)I don't have problems with my pump and degasser.
3) The internal temperature of my lab is very stable.
4) All DAD-Lamp are accepted.
5) My W-Lamp has 600 hours (the intensity test is good).
6) I don't have leaks (The leak test is negative)
7) My mobile phase is Acn:Water (50:50)
8) My column is a C-18 (250 mm x 4.6 mm 5um).
I has observed that the DAD-Lamp Voltage is not stable (62 at 73V). What can to cause variations on DAD Lamp Voltage?
Or are there others sources for my problem?
By john b on Wednesday, September 4, 2002 - 04:27 am:
you may just have a bad lamp.... try a new one... we have had similar situations where this would be the cure.
By deST on Wednesday, September 4, 2002 - 07:11 am:
Hi John B.
Tanks for your help.
But what can to cause variations on DAD-Lamp Voltage?
By A.Nonymous on Wednesday, September 4, 2002 - 08:59 am:
Hi deST, ask your manufacturer, I guess they have already simular problems seen, they could help you (if they want).
By deST on Wednesday, September 4, 2002 - 10:33 am:
Hi A.Nonym.
Tank you for your help.
By Tom Mizukami on Wednesday, September 4, 2002 - 01:09 pm:
deST,
On the 1100 the tungsten lamp is powered by a constant 6 VDC. The deuterium lamp is ignited with a 600 VDC ignition pulse and is powered by a 320 mA constant current source. Normally as the lamp heats up the voltage changes to maintain a constant current.
By A.Nonymous on Thursday, September 5, 2002 - 08:37 am: