Section II. MAINTENANCE AND REPAIR PROCEDURES
Before the suction apparatus is put into service, you must calibrate it to ensure
the unit performs within tolerances and specifications. The following paragraphs list the
steps to properly calibrate the programmable suction system for reliable operation.
a. Required Equipment. Only two items are required for calibration of the
programmable suction system.
(1) Oscilloscope, direct current (dc), triggered, with a minimum five-second
horizontal sweep. Some storage capability is desirable.
A small, slot-head screwdriver.
Maximum low-vacuum-level limit.
(a) Set the controls for either alternating current (ac) or direct current
(dc) operation (ensure the batteries have been fully charged if you are calibrating from
(b) Select the CONTINUOUS and LOW VACUUM modes of operation.
Turn the vacuum-control knob ON and fully clockwise.
(d) Occlude (plug or otherwise seal) the rear-panel-vacuum inlet and
adjust the resistor R2 for a 200mmHg reading on the front-panel vacuum gauge.
(e) You can verify this reading by using a calibrated vacuum gauge
applied to the vacuum inlet.
Intermittent ON/OFF timing circuits.
(a) Set the controls for either ac or dc operation (ensure the batteries
have been fully charged if you are calibrating from battery power).
(b) Select INTERMITTENT and LOW-VACUUM operation.
Set the ON/OFF times for five seconds ON, five seconds OFF.
(d) Turn the vacuum-control knob ON and fully clockwise.