User manual

MC-III™ EXP Flow Analyzer Section 4

Pulse Output

The Pulse Output screen (Figure 4.32) allows users to congure the MC-III EXP to provide a pulse output

representing increments in volume. A test mode function is also included, allowing a user to calibrate and/or

verify the output received by an end device.

Figure 4.32—Pulse Output screen

Conguring Pulse Output

By default, the pulse output option is disabled to reduce current consumption. To conserve power, do not

enable this feature unless it will be used.

To enable the pulse output option, perform the following steps:

1. Check the “Enable” checkbox.

2. Enter the pulse duration value using the “plus” and “minus” buttons on the screen, or the page-up and

page-down keys on a computer keyboard. The pulse length (pulse width) determines the length of each

output pulse in milliseconds (ms).

3. Click on the pencil icon next to the scale eld to open a data-entry window (Figure 4.33, page 74), and

enter the scale factor. Adjust the decimal position, if necessary, using the slide bar. The scale factor sets

the volume increment that will cause a pulse output to occur. The unit for this factor is determined by the

unit set for the volume display.

Note—The scale factor can be any number; it is not limited to powers of 10 (1, 10, 100, etc.).

In applications where high ow rates may occur for extended periods, pulses can be lost due to the

instrument’s inability to register the ow rate at the maximum output frequency. To avoid the loss of pulses,

users can raise the scale factor or shorten the pulse duration. The software calculates the maximum ow

rate that can be reached before pulse caching is likely to occur, and displays the information on the Pulse