eDAQ e-corder, Manual

Page: 41 / 112

Chapter 3 — The Dual Picostat 37
baseline current is being monitored click the button. It may take
a few seconds to zero the signal. Normally this will suffice to accurately
zero the signal, and you can then choose a more sensitive current
range setting to observe your signals. Use the buttons to manually
adjust the amount of offset if required (use Ctrl-click for fine adjustment).
Each Dual Picostat channel can have a different amount of offset
applied to its current signal.
The amount of current offset is reported in the text box, in
which you can also enter a value directly.
If you need to zero the current signals after recording has started, then
you can use the Zero All Inputs command in the Chart software Setup
menu,
Figure 3–9 .
Maintenance
The Dual Picostat will not require maintenance during daily operation.
However, you should periodically check it for optimum results.
First set up the Dual Picostat and
e-corder
as outlined earlier in this
Chapter. Connect the electrode cables connected, and attached to the
10 Mohm test resistor, as described in the section on
First Use,
page 30 .
Open the Picostat Control window, Figure 3–7 or Figure 3–8 . Adjust
the gain range to 200 nA to accommodate your signal amplitude, and
select the 10 Hz low-pass filter (and/or Mains Filter) to minimise high
frequency noise on the signal — especially if you are working outside a
Faraday cage.
Figure 3–9
The Chart software Setup
menu.