MKS PR 4000 F, Instruction Manual

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Chapter 4: Operation PR4000F
26
Signalmode
(extra window for channel 1 and channel 2)
SIGMODE:
For controllers the parameter SIGMODE determines the source of the setpoint which shall be
applied the the respective channel. For meters this parameter determines to which value the
setpoint output is set.
INDEP (Independent) Setpoint is set either by the front panel settings or
by remote host computer. Manual setpoint adjust can be done
either in the setup submenu or in a window in the operational level
(if the window is configured for displaying setpoint).
OFF Setpoint output voltage is set to a fixed voltage of about – 0,5 V .
This ensures that the integrator of a controller connected to this
channel does not wind up thus opening the control valve
unintendendly. The digital output connector CHANNEL1 or
CHANNEL2, pin 4 is held to LOW. This activates the input
Valve
Close of MFC’s, forcing the control valve to be closed.
METER Setpoint output voltage is set to zero volts. Valve override line via
pin 4 of the respective channel connector is set to HIGH.
RTD Range-Turndown (RTD) allows operation of a Baratron type 120.
The digital output pin 4 of connector CHANNEL1 or CHANNEL2 is
set to LOW when the signal of the type 120 is falls below 1 V. This
enables the PR4000F to display also the lower pressure decades
in full reolution.
Refer to section CONTROL detailed instructions.
SLAVE The setpoint of a slave channel is derived from the other channel’s
signal. This allows the control of gas mixing systems with a fixed
flow ratio.
EXTRN (external setpoint) The channel’s setpoint is derived by an external analog voltage
source, connected to connector
EXTERN .
SIGMODE1 INDEP
SCL1 10.000 mbar