Digimet 3000 - Pulsation Electronic; Calibration; Unit Initialization; Auto-Zero

29
100%
Ratio Rest = Rest Time / Total Time *
100%
Max / P = Maximum vacuum per pulse
Min / P = Minimum vacuum per pulse
Pulses per Minute = 60 sec/Total Time
Note: Regarding Pulsator Ratio or Milk/
Rest Ratio function data which appears
on Digimet Printer graphs or computer
graphs: The numeric data represents
the last complete waveform
which
appears on the graph.
Pulsation Electronic
The method of calculating the Pulsation-
Electronic measurements is similar to the
Milk/Rest ratio. Here, the trip point is fixed
at 6 volts. This allows a good indication
for the beginning and end of a pulse in
either 0-12 or 0-24 volt systems. The two
time intervals, ON interval and OFF
interval, are calculated along with the
absolute minimum and maximum voltage
values. At the end of each pulse, the min/
max values are reset.
The following is then calculated:
ON = On Interval / Total Time * 100%
OFF = Off Interval / Total Time * 100%
Max V/P = Maximum voltage DC per
pulse
Min V/P = Minimum voltage DC per
pulse
Pulses per min. = 60 sec / Total Time
CALIBRATION
The DIGIMET 3000 requires factory
calibration in order to characterize the
various components in each particular unit.
Because of the high accuracy and stability
over time of the components, subsequent
calibrations are generally not anticipated.
However, since the DIGIMET 3000 may be
exposed to conditions that could be harsh
for an electronic instrument (roughly
handled, left on a hot car seat for a day,
etc.) it is a good idea to periodically check
the DIGIMET 3000 against a known
accurate standard. To insure accuracy it is
recommended to return the Digimet 3000
to the factory for re-calibration once per
year.
Unit Initialization
The DIGIMET 3000 leaves the factory with
the following initial settings:
Storage Memory Cleared
Time Frame = 1 sec
LCP = 6.5" Hg
Display Units = " Hg
Type Pulsation - Single
Auto Shut-off set at 10 minutes
Auto-Zero
When the DIGIMET 3000 is set to the
Vacuum Level Function with no input, it
will auto-zero. See section on Auto-Zero
for further details.
HARDWARE SPECIFICATIONS
This section describes the DIGIMET 3000
hardware design.
Microprocessor
The DIGIMET 3000 uses a Motorola
microprocessor to provide the system
functions. The microprocessor runs at 4.0
Mhz.
Power Subsystem
The power system is supplied by four AA
alkaline batteries.