Chapter 1 — Overview
7
The detector inputs used to record signals from ±10 V to the microvolt
range without the need for additional external amplification. Each
analog input has an independently programmable gain amplifier. Note
that applying more than ±15 V to the detector inputs could possibly
damage the circuitry. The detector inputs are marked ‘CH1’ and ‘CH2’
and their ground connections are marked ‘COM’ (common).
Injection Signal (Trigger) Input
A contact closure from the injector is often used to mark sample
injection time. The contact closure must be longer than 10 ms to be
registered. The Inject Signal, or Trigger, indicator (the lowest one on the
front panel), will glow yellow when contact closure occurs. The
PowerChrom Software Manual
covers its practical use in normal
recording. The inject signal connections are marked ‘Trig’ (for Trigger).
Analog Output
The PowerChrom unit can generate a controlled voltage (0 – 10 V,
controlled from the PowerChrom software) through the analog output
pins, marked ‘DAC’ (for digital-to-analog convertor).
1
2
3
4
TTL
COM
COM
COM
TRIG
CH1
CH2
DAC
CTL1 CTL2 CTL3 CTL4
TTL TTL TTL
Digital output 4
Digital output 1
Digital output 2
Digital output 3
+
Analog output
Inject signal input
–
+
–
+
–
+
–
+
–
+
–
GND
+
–
GND
+
GND
Detector 1 input
Detector 2 input
Digital output 1, TTL/Contact Select
Digital output 2, TTL/Contact Select
Digital output 3, TTL/Contact Select
Digital output 4, TTL/Contact Select
Remove links for
contact closure
GND
GND
Figure 1–3
The pin assignments for
the Instrument
Connection Port, and the
link configurations.
