eDAQ Picostat, User Manual

Page: 49 / 122

Chapter 4 — The QuadStat 45
NOTE 1: The overload light may come on when a QuadStat channel is
being used for a second, third, or forth working electrode, and the
corresponding reference and auxiliary electrode connectors are not
being used, see
Using a Common Reference and Auxiliary, page 50 .
Under these conditions this does NOT indicate abnormal operation.
NOTE 2: A potential overload is quite different from a current overload
condition. A current overload is caused when the current signal
exceeds the full scale limits of the sensitivity setting of the current
channel. This is, in turn, due to a low resistance between the electrodes.
In some circumstances a current overload can also cause the QuadStat
overload indicators to light.
The Back Panel
The back panel of the QuadStat is shown in Figure 4–2 .
E Out, I Out and E In Connectors
The QuadStat is supplied with a 20 pin screw terminal adaptor, Figure
4–3 , which plugs into the 20 pin socket on the back panel. The pin
positions are labelled I Out, E Out, E In, and COM, for each QuadStat
channel (Channels 1 – 4).
The COM (common) pins are provided for connection to signal ground
(black wires of the supplied coaxial cables,
Figure 4–5 ). You can use
any COM pin for the ground connection of any I Out, E Out, or E In
signal.
Digital Ground Regulated –17 V DC Reg8 V DC Reg17 V DC
Power lines
SCL DSC SDA DSD INT
I
2
C control signals
Digital Ground Regulated –17 V DC Reg8 V DC Reg17 V DC SCL DSC SDA DSD INT
I
2
C control signals
Input Output
1
6 9
5 5
9 6
1
▲ WARNING!
The I
2
C connectors are
for the power and
control of
eDAQ
Amps, page 2 , and
should not be used for
connection to any
other device.
Figure 4–4
The I
2
C connectors.