Section 4
Page 4 - 10
MODEL 346 INSTALLATION AND OPERATION MANUAL
HA243821
Issue 5 Mar 98
4.8 CHANNEL CONFIGURATION (Cont.)
4.8.4 LINEARISATION FUNCTION
C1 Lin. Func.
Linear
This page selects the relationship between the input signal and the recorded / displayed value. The up and down
arrows are used to scroll through the following possible choices:
OFF
The channel value is displayed as OFF, and the trace is printed at the left edge of the chart
(unless the trace is turned OFF).
Linear
No linearisation is applied to the input signal.
Square root
The recorder applies a square root function to the input (eg input =4, output =2).
3/2 power
The recorder takes the square root of the input, and raises the result to the power of 3 (e.g.
input = 4; output = 8).
5/2 power
The recorder takes the square root of the input, and raises the result to the power of 5 (e.g.
input = 4; output = 32).
Log-Base 10
Applies anti-log function to input signal (eg input = 4, output = 10,000).
Custom curve
Applies a user-entered linearisation table to the input signal.
Thermocouple
Applies Type B, C, E, J, K, L, N, Ni/NiMo, R, S or T linearisation to the input signal.
RTD
Applies 10 ohm copper, 100 ohm Pt (ANSI), 100 ohm PT (DIN), 100 ohm Nickel or 120 ohm
Nickel resistance thermometer linearisation to the input signal.
Comms
‘Comms’ must be selected if values are to be written to process variables from a host computer.
Note...
Refer to Section 2.4 for information relating to the input amplifier board links which have to be set according to
the type of input.
4.8.5 CHANNEL UNITS
C1 Units
˚C
This page allows the up and down arrows to be used to select ˚C, ˚F or user-entered units for the channel input
signal. These units appear in any display page which includes the relevant channel’s units.
4.8.6 DECIMAL POINT POSITION
C1 Dec. Point
X.XXXX
The display shows the current position of the decimal point in the channel’s displayed variable. The up and down
arrow keys can be used to scroll through the choices: X.XXXX, XX.XXX, XXX.XX, XXX.X and XXXXX.It should
be ensured that the number of decimal places chosen is not beyond the resolution capability of the input trans-
ducer, and that the least significant digit(s) do not change so rapidly as to make the display difficult to read.
4.8.7 PROGRAMMABLE UNITS
C1 Prog. Units
This page appears only when programmable units have been selected in the units display page previously de-
scribed. The up, down and side arrow keys are used to enter the units string required by the user.