Dionex AXP/AXP-MS Manual
7.2.7 Voltage Input
The remote voltage flow control is implemented by connecting a
negative input to the rear panel VOLTAGE COM connection and a
positive input to the VOLTAGE IN connection. A 0-10 VDC input
corresponds to a 0 to 10.00 mL/min flow rate. Any device capable of
sourcing at least 0.0005 amp will work. Also, the voltage control mode
must be selected and enabled as described in Section 7.2.6. To prevent
a ground loop current, isolate the voltage source which drives the
VOLTAGE IN and VOLTAGE COM connections from the safety
ground. If the pump’s displayed flow rate jumps up and down
erratically, suspect a ground loop problem.
7.2.8 Frequency Input
The remote frequency flow control is implemented by connecting a
negative input to the COM connection and +5 VDC square wave input
to the FREQ IN connection. Any device capable of sinking and
sourcing at least 0.008 amp will work. A 0 to 10,000 Hz input
frequency will correspond to a 0 to 10.00 mL/min flow rate. Also, the
frequency control mode must be selected and enabled as described in
Section 7.2.6.
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