Manual

Programming Basics and Setup 5-15
Table 5-2 Flow Rate Maintenance Options
Command Description
On Timer
A Flow Rate Calibration will be performed according to the time value (in
seconds) entered in the On Timer text box. A flow rate calibration will also
be performed on the first board of every run. The timer is reset each time
the Run Production Window is opened.
On Run Count
A Flow Rate Calibration will be performed after completing the number of
boards entered in the On Run Count text box.
Enable Multiple
Flow Rate
Calibrations
Allows the calculation of multiple Flow Rate Calibrations. When this
feature is activated, you can specify the number of Flow Rate Calibrations
you wish to perform by typing a number in the runs text box.
Number of
Dispenses to
Average
Controls the number of dispenses performed during a single Flow Rate
Measurement procedure. The number entered should imitate your
dispensing application as closely as possible so that Flow Rate
Maintenance can be adjusted to dispense precisely how it should during
the production run.
Skip First Shot in
Flow Rate
Calibration
If enabled, will direct FmNT to automatically skip computation of measured
flow rate for the first shot of fluid dispensed. This option is useful if the
weight of the first shot tends to be significantly different from that of all the
subsequent shots. In such cases, skipping the first shot will produce a
more accurate flow rate calibration. The first shot is in addition to the
programmed number of shots to be averaged during calibration. For
example, if there are five shots programmed, six shots will be taken, but
the first one will be ignored.
Dispense
Duration
Controls the duration of a single dispense during a Flow Rate
Measurement procedure. The duration entered should imitate your
dispensing application as closely as possible so that Flow Rate
Maintenance can be adjusted to dispense precisely how it should during
the production run.
Time Delay
between
Dispenses
Controls the amount of time FmNT waits between dispenses during a
multi-dispense Flow Rate Measurement. The duration entered should
imitate your dispensing application as closely as possible so that Flow
Rate Maintenance can be adjusted to dispense precisely how it should
during the production run.
Dispensed
Weight Bias
Adjusts the amount (weight) of fluid to be dispensed during weight-
controlled instructions. If the weighed fluid is consistently over or under
the desired percentage of fluid after flow rate calibration, you can set the
bias to compensate for the hardware variation. Bias is necessary to
ensure consistent fluid dispensing.
Valid Flow Rate
Range
Specifies the acceptable range of measurements during a Flow Rate
Calibration. If the flow rate is outside of the valid range, the software will
notify the operator and will not use the invalid flow rate. The default is 0.1
to 999 mg/sec. You can change these values as needed to fit your
particular requirements by clicking in the text boxes and entering the
desired values.
" NOTE If Local Machine Offsets is active, the “Dispensed Weight Bias” parameter will
be labeled "Local Machine Valve Bias."