Antec Scientific ROXY Exceed, Руководство пользователя, Страница: 117 / 126

CHAPTER 10 Troubleshooting 117
well-functioning VT-03 flow cell in an ideal (U)HPLC set-up. The noise
generated via the dummy should be less than 2 pA if the filter of the con-
troller is set to off, provided that the dummy is within the fully closed Fara-
day shield at the same position as the flow cell.
Table XI. Dummy cell test settings.
Parameter Setting
Cell potential 800 mV
Oven
35 °C, stable
Filter Off
Range 1 nA/V
Test criteria:
•
I cell = 2.67 +/- 0.05 nA
•
Noise < 4 pA
The results (cell current and noise) of the dummy cell test should be
within the above mentioned test criteria. If the current value Icell and
the noise are not within the criteria it is an indication that something
could be wrong with the potentiostat hardware. Please consult your
local representative.
Internal dummy cell
The ROXY (Exceed also has the option to run a so-called internal dummy
cell test. This exclusively checks the performance of the electronic circuit
boards (amplifier circuitry) only, so it excludes the cell cables and the ex-
ternal dummy flow cell. From the MAIN screen DIAG can be selected to
enter the DIAG screen, followed by selecting NOISE. This activates a timer
in the NOISE screen, and after 10 seconds stabilization auto zero is acti-
vated and the dummy cell test is ready. Noise of the internal dummy cell
can be measured at the output. As with the external dummy cell the noise
should be better than 4 pA. Potentiostat settings in the NOISE screen are
the same as in the external dummy cell test with the exception of the oven
temperature. Temperature is switched off.