Amptec Research 620UK-B Kurulum, Kullanım ve Bakım Kılavuzu - Sayfa 14
Ölçüm Cihazları Amptec Research 620UK-B için çevrimiçi göz atın veya pdf Kurulum, Kullanım ve Bakım Kılavuzu indirin. Amptec Research 620UK-B 19 sayfaları.
Sayfayı Yazdır620UK-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.
13231 Rooster Springs Rd.
Austin, TX 78737
Page 14
T: (512) 858-4045 E: [email protected]
amptec.com