Annex A
Page A - 6
HA243820
Issue 5 Mar 98
MODEL 346 INSTALLATION AND OPERATION MANUAL
A3.0 CHANNEL CONFIGURATION
A 3.1 INPUT CHANNELS
DISPLAY
SCROLLABLE VALUES
DESCRIPTION OF PARAMETER OR FUNCTION
Trace
On/Off/Adaptive
The up or down arrow key is used to set this channel's trace on, off or
adaptive.
Interplt.
On/Off
The up or down key is used to set interpolation on or off for this channel
Pen colour
Violet, brown, blue, green, black, red
Alows the trace colour for the channel to be defined
Lin. Func.
Off
Channel value is displayed OFF. Trace is printed at the left edge of
chart, if not disabled.
Linear
No linearisation is applied to the input signal
Square Root
Applies square root function. E.G. input = 4; output = 2.
3/2 Power
Applies square root function, then raises the result to the power of 3.
E.G. input = 4; output = 8.
5/2 Power
Applies square root function, then raises the result to the power of 5.
E.G. input = 4; output = 32.
Log Base 10
Applies anti-log function. E.G. input = 4, output = 10,000.
Custom Curve
Applied a user entered function to the signal.
T/C Type B, C, E, J, NiMol
Applies a linearisation for the thermocouple or RTD selected.
K, L, N, R, S, T
10 ohm Cu, 100 ohm PA
100 ohm PD, 100 ohm Ni, 120 ohm Ni
Comms
Must be selected if values are to be sent to PVs by a host computer
Note...
Hardware links on all the relevant input boards must be set up correctly for the type of input to be applied. See section 2.4
of this manual for details.
Units
˚C, ˚F, Prog units
Allows degrees Celsius, degrees Fahrenheit or programmable units to
be selected as the channel's displayed units. The programmable units
string is entered later.
Dec. Point
None
The up and down arrow keys are used to move the decimal point posi-
tion for the channel display left and right respectively, between 'X.XXXX'
and 'XXXXX.'
Units Str.
Text entry
This page appears only if Prog.Units has previously been selected. The
up, down and side arrow keys are used to enter a units string as de-
scribed in section 4.4 of this manual.
Input type
Ohms, Millivolts,
Defines the type of input to be connected to the input amplifier. See
Volts, Thermocouple
section 2.4 for hardware configuration link details.
Range low
None
The up, down and side arrow keys are used to enter the lowest value to
be measured, in engineering units.
Range high None
Allows the highest value to be measured, to be entered in engineering
units.
Input low
None
Present only when the input type chosen is Volts, millivolts or Ohms.
The up, down and side arrow keys are used to enter the lowest value of
input signal.
Input high
None
As for Input low, above, but for the highest value of input signal.
Chart low
None
The up, down and side arrow keys are used to enter chart 'zero'.
Chart high
None
The up, down and side arrow keys are used to enter chart full scale.
Mag. centre None
Allows a value to be entered for use as a centre point for Range Magnify
and Trace History options.
Filter Time
None, 1, 2, 4, 8, 16, 32 seconds
This function changes the response from the normal 0.5 seconds (none)
to the scrolled value of seconds.
C.J.Type
Internal, External
Appears only when thermocouple is selected as input type. The up or
down arrow key is used to select the internal or an external source for
cold junction reference. If external is selected, the external temperature
is entered in the Instrument Configuration.
Ch. Desc.
Text entry
The up, down and side arrow keys are used to enter a channel descrip-
tor as described in section 4.4 of this manual.
Ch. Adjust
None
The up/down/side arrow keys are used to adjust the measured/recorded
values to agree with other measurements.
Table A3.1 Measuring channel configuration parameters
