9
The Digimet 3000 will accept a vacuum
input with the following characteristics:
Range —
0-18” Hg, equivalent to 0-60.9 kPa
Frequency —
30 -120 Pulses Per Minute,
equivalent to .5-2 Hz
Electronic Pulsation Input
The Digimet 3000 will accept an oscillating
electrical input from 0 volts to +/- 30 DC
volts. Over-voltage protection is provided
for inputs up to 50 DC volts so that the unit
will not be damaged. The electrical input
accommodates up to 40 amps. The
polarity of the input signal is rectified to
guarantee that all voltages are positive. An
internal filter is incorporated to eliminate
sharp voltage spikes that occur during
solenoid switching. DO NOT TOUCH
CONNECTORS TO 110-VOLTS OR 220-
VOLT AC INPUTS.
Resolution and Accuracy
Vacuum Display and Unit Relationships
All vacuum (pressure) measurements will
be displayed according to the selected
Vacuum Display Unit. The available units
are Inches of Mercury (“Hg) and
kilopascals (kPa).
The following provides an orientation to
the equivalency of various pressure units:
1 atm ≈ 30.0” Hg ≈ 14.7 psi ≈ 101 kPa
The actual conversion factor used is:
1” Hg = 3.3864 kPa
The following resolutions are used:
Units Precision Display Range Example
“Hg 100ths 18.00 12.05
kPa 10ths 60.9 45.5
The performance specifications for the
various measurement types are defined in
the table below. Specifications are for the
entire operating range of the Digimet
3000, and for a temperature range of 32-
150 degrees Fahrenheit.
Calibration
The Digimet 3000 is factory calibrated. Its
components are designed so that losing
calibration is unlikely, but if the unit is
subjected to harsh environments or
treated roughly, it may need factory
recalibration at some future time. But, as
any electronic instrument, yearly
recalibration is recommended.
FUNCTION
This section describes the operation and
features of the Digimet 3000.
The functions of the Digimet 3000 are
divided into the following areas:
System Functions
Auto Shutoff
Battery Low Indication
Reset
Data Display Hold
Store/Recall
Store Graph
Print/Upload
Limping data
Timer Stamp
Labeling
Auto Zeroing
Measurement
Units Resolution Accuracy
Vacuum
“Hg 0.01 +/-.06
Vacuum
kPa 0.1 +-.2
Time
msec 1 +-1
PPM
ppm 0.1 +-.1
Ratio
% 0.1 +-.1
Voltage
DC Volts .1 +-.3
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