The AMPTEC 620UK Ohmmeter Current Source PCB and DVM PCB are epoxy
conformal coat
encapsulated
both the top and bottom side of each PCB. This PCB encapsulation
provides
excellent
humidity resistance,
moisture
condensation resistance
,
dust and dirt PCB contamination resistance.
In additional, it provides PCB
electrical insulation preventing virtually
any kind of mechanical circuit damage (loose or broken
wire(s), loose
washer, accidental component substitution or component lead damage that can happen while servicing,etc.) and
helps
prevent virtually all compromisation of the AMPTEC 620UK Ohmmeter’s EEx-ib IIC-T4 Intrinsically
safe circuitry. In the past, some safety ohmmeters (i.e. ALINCO 101 series) have a history of faulty service
related (i.e. wrong component or electrical current limit fault) failures which have had catastrophic and
deadly result when connected to an explosive device .
(Virtually anything can fail when serviced wrong,
i.e. missiles, rocket motors, smart munitions, vital Jet engines etc. )
E-4
AMPTEC 620UK Ohmmeter Assembly/Disassembly Diagram
620UK CASE
Battery wiring
Security Screw
Security
Screw
Security
Screw
BEZEL
REAR P
ANEL
BEZEL
Security
Screw
Security
Screw
Security Screw
Security Screw
(machine thread)
Security Screw
CURRENT
PCB
SLIDE PCB
IN/OUT SLOT
IN SIDE OF
CASE
DVM PCB
Circuit Board Slot
Circuit Board Slot
16
16
