Amptec Research 620UK-B 설치, 운영 및 유지보수 매뉴얼 - 페이지 14

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620UK-B Operation and Maintenance Manual – Rev J – January 2020

The DVM PCB's electronics use a high input impedance voltage sense circuit. This

circuit draws very little current, while measuring the DC voltage drop across the

resistance under test. The AMPTEC 620UK-B main PCB slides in easily, by following

grooves on the inside of the aluminum case.

Schematics for the 620UK-B's PCB are protected and strictly confidential, regardless of

the circumstance.

E-4 Block Diagram and Circuit Description

620UK-B Block Diagram

E-5 Principle of Operation

Using Ohm's Law (V/I =R), the AMPTEC 620UK-B Bond Meter first outputs constant DC

current through a given test resistance, then measures the voltage drop across it while

scaling its display as resistance. The 1.9999 Ω range outputs a constant 100 mA DC

level of test current. On a 1 Ω resistor, the 620UK-B 100mA output should get a 100mV

drop (0.10V/0.10A). For DVM scaling on the 2 Ω range, voltage drop is amplified using a

x10 (for range scaling), hence a 10 mV drop becomes 100mV. This DVM input is

displayed as 100.00 m Ω on a 0.100 Ω std. During the cycle, the meter changes

polarity, samples again, and displays the average reading of both polarities.

E-6 PCB Troubleshooting and Diagnostic Testing

If the malfunction is a faulty part, the repair of the 620UK-B meter can be attained by

replacing the proper internal PCB. There are no serviceable components (much of the

components are surface mount) on the 620UK-B PCBs, so it is often a case of entire

PCB replacement. See section E-2 on page 13 for more information about sending your

product in for repair.

The following sub-sections will facilitate the diagnosis as to whether the AMPTEC

620UK-B current source circuitry or digital voltmeter circuitry needs repair or

replacement. These steps should only be performed by authorized personnel who are

trained to do so.

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