eDAQ e-corder, Manual

Page: 53 / 112

Chapter 4 — The QuadStat 49
Input Amplifier dialog box, described in the Chart and Scope Software
Manuals .
Using a Common Reference and Auxiliary
Often the QuadStat will be used with a single reference electrode, RE,
and a single auxiliary electrode, AE
1
, (on QuadStat channel 1) with
multiple working electrodes (WE
1
, WE
2
, WE
3
, WE
4
) on some, or all,
of the other QuadStat channels. To monitor the applied potential signal
for Channels 2–4 connect the unused AE and RE sockets together. You
can use the extra AE and RE lead wires supplied with the QuadStat,
connecting the alligator clips to one another, for this purpose, see
Figure 4–8 .
If the unused AE and RE sockets on Channels 2, 3, or 4 on the front
panel of QuadStat remain unconnected (as shown in
Figure 4–7 ) then
the QuadStat will still function correctly. However the corresponding
potential signals at E Out
2, 3, 4
are not accurately monitored, and the
overload lights on these channels will come on — but this does NOT
indicate a fault condition. Only the overload light of Channel 1 (where
the reference and auxiliary electrodes are connected) is now able to
correctly indicate an overload.
When you use a common reference and auxiliary electrode with
multiple working electrodes, AND use an external waveform at E In on
Channel 1, this waveform can be effectively applied to all working
working electrodes by linking the E In connectors together (as shown
Figure 4–6 ). For example if a triangular waveform is applied at
QuadStat Channel 1 then all the QuadStat channels will perform cyclic
voltammetry. The triangular potential waveform can be offset at each
separate working electrode by using the Applied Potential control,
page 55 .
Finally, when you use a common reference and auxiliary electrode with
multiple working electrodes, make sure that all the QuadStat channels
are set to the same cell mode (Standby, Dummy or Real),
page 54 .
Recording signals with some channels set on Dummy, while others are
on Real/Standby can cause incorrect current signals.