Section 4
Page 4 - 12
MODEL 346 INSTALLATION AND OPERATION MANUAL
HA243821
Issue 5 Mar 98
4.8 CHANNEL CONFIGURATION (Cont.)
4.8.9 RANGES, INPUTS & CHART SPANS (Cont.)
Chart:
In the above example, only the -100 to 100 foot portion of the range is needed on the chart. The
chart low/high settings permit the setting of a chart range that is not the same as the channel low/
high range.
HIGH AND LOW RANGE
C1 Range Low/High
X.XXXX units
X.XXXX
This is the Low / High end (in Engineering Units) of the Displayed and/or Recorded range. The
values are entered using the Up/Down/Side Arrows.
Although the recorder may function beyond the entered TC/RTD range endpoints, performance will be affected
once the selected span is exceeded. Stated recorder TC/RTD accuracy is valid only within the entered Range
limits.
Example:
A Type J thermocouple range of 0 to 500 degrees F represents a span of 14.993 mV. This Range causes the
recorder to choose an operating span of -4.0 to 20.0 mV. Above 663 degrees F (20 mV) the recorded and/or
displayed temperature values will not necessarily be within stated accuracy.
Note that the previously selected unit-of-measure will appear on these range displays.
INPUT HIGH AND LOW VALUES
C1 Input Low/High
X.XXXX
Ω
,V,mV
This display is present only when the Input Type chosen is ‘Volts’, ‘Millivolts’ or ‘Ohms’. The Up/Down/Side arrow
keys are used to define the low and high end electrical input values.
For these Inputs, the internal operating span (gain) will be calculated from the entered Input values. The recorder
may function outside these Input settings (up to the maximum Input values permitted), but stated accuracy is valid
only within the Input settings.
If‘ ‘Ohms’ is chosen as the input type and any RTD type chosen as the linearisation function, no input low or high
value need to be entered. The internal operating span (gain) will be calculated from the range low/high.
If ‘Ohms’ is chosen as the input type and ‘linear’ or ‘custom curve’ is chosen as the linearisation function, both
Input Low and High values must be entered to define a specific resistance input and permit calculation of the
internal span.
CHART HIGH AND LOW VALUES
C1 Chart Low/High
X.XXXX units
These are the low and high end values of the chart record (not necessarily the same as the Range Low/High
values). A segment of the Range can be expanded for more detailed chart recording. Also, the chart span can be
greater than the Range, effectively limiting the record to a portion of the chart.
