eDAQ EA168, User Manual

Page: 11 / 44

Chapter 2 — The pH/mV Amp 7
The Back Panel
The back panel of the Quad pH/mV Amp is shown in Figure 2–2 .
The Signal Outputs
The Quad pH/mV Amp back panel has four BNC connectors labelled
Channel 1 — Channel 4.
The Quad pH/mV Amp provides four signals, one for each sensing
electrode.
Made in Australia by eDAQ Pty Ltd.
No user serviceable parts inside.
Refer servicing to qualified service personnel.
Input
Output
I C
Bus
I C
2
Channel 4 Channel 3 Channel 2 Channel 1
1 5
9 6
Digital Ground Regulated –17 V DC Reg8 V DC Reg17 V DC
Power lines
SCL DSC SDA DSD INT
I
2
C control signals
1 5
9 6
Digital Ground Regulated –17 V DC Reg8 V DC Reg17 V DC SCL DSC SDA DSD INT
I
2
C control signals
Input Output
pH/mV signals, BNC connectors
DB–9 pin, I
2
C connectors
Chassis ground, 4 mm post
Figure 2–2
The pH/mV Amp back
panel
Figure 2–3
I
2
C connector pin
assignments