How To Set Up a Dual Channel Display
Chapter Seven: Operation in Setup Mode
206
Two Types of Dual Channel Operation - Continuous and Discontinuous
Continuous operation means the 146 unit smoothly transitions the pressure readout (in the main
display), from one sensor to another over the pressure range where they overlap. This is done by
creating a percent gradient which gives the lower range sensor’s reading a greater weight in
calculations at the lower end of the overlapping range, and the upper sensor’s reading a greater
weight at the higher end of the overlapping range. The range is delimited by user-defined
switchpoints.
Discontinuous operation means the 146 instrument switches the pressure readout from one sensor
to the other at the user-defined high and low switchpoints. The readout shows output from only
one sensor at a time. The sensor outputs are not combined over the area where the sensors’
ranges overlap.
The dual channel display function can be enabled or disabled.
Note
The following instruction sequence is the same for setting either the low
or high switchpoint setting.
1. Repeatedly press the [
DISPLAY MODE
] key until the 146 unit is in Setup Mode.
The system responds by scrolling through modes.
2. Use the arrow keys to scroll to the
DUAL CHANNEL THRESHOLD
legend.
The system responds by displaying dual channel parameters.
3. Select either H(high) or L(low) switchpoint in the left display, with the [+/-] key.
The system responds by toggling between the high and low switchpoints.
4. Enter the dual channel number (1 or 2), which is also in the left display, then press the
[
ENTER
] key.
The system responds by accepting the channel number, and causing the main display to
blink.
5. Enter the switchpoint value. The range for both the upper and lower switchpoints is a
floating point value between 0 and 25,000 inclusive. The default is 0.
Note
A general rule of thumb is that the high and low switchpoints should
differ by at least a factor of ten. It is possible to enter values with less of
a difference, but then there is a risk of getting a negative slope when the
unit is set for continuous operation. If the difference is too large, the data
displayed may be unreliable. What is considered “too large” depends
upon the type of gauges used.
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