Short Circuit Current - SCI
(Guns)
The Ransburg Multi-Function Meter may be
used to measure the short circuit current of an
electrostatic applicator. The short circuit current
measurement is important in troubleshooting
problems with electrostatic power supplies and
applicators. These tests should be performed
when a noticeable decrease in transfer efficiency
occurs. The measured short circuit current value
should be compared to the value listed in the
appropriate power supply or applicator manual.
This comparison indicates if there are problems
with the power source or the applicator.
Operation
1. Set the meter dial to the µA scale (see Fig-
ure 5). Plug the probe with two (2) alligator
clamp leads into the side of the meter. Check
the meter calibration by touching the metallic
ends of the two (2) probes together. If the me-
ter reads zero, the meter is in calibration. If it
does not read zero, verify the continuity of the
probe assembly and re-perform the check. If
the meter still does not read zero, consult the
factory for repair of the meter.
Ensure that meter's scale is proper-
ly set for the function in which it is being
used. Damage to equipment may result if
improperly set.
Prior to starting the SCI tests, ensure the
voltage at the power supply is turned off.
W A R N I N G
!
C A U T I O N
!
2. Attach one of the alligator clamps to the elec-
trode (brush on the #2 process bell). Be sure
the clamp makes good contact with the elec-
trode (small wires on the #2 brush). Attach the
second alligator clamp to ground, preferably
the handle or bracket.
3. Apply voltage to the gun from the power supply.
The meter should read between the ranges
indicated in the power supply and applicator
manuals.
Test Equipment - Introduction, Operation & Maintenance
TE-98-01.7
12
