Amptec Research 620UK-B 설치, 운영 및 유지보수 매뉴얼 - 페이지 15

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

E-6.1 Current Source PCB Diagnostic Test Routine

The following steps can help determine if the current source circuitry is faulty:

1) Put output leads across a 0.100 Ω resistance standard (0.005% or better).

2) Measure the voltage drop with a DC Voltmeter. It should be 0.0100V.

If the above test proves untrue, then the current source circuitry is possibly faulty, and

may need replacing. See section E-2 on page 13 for more information about sending

your product in for repair.

E-6.2 Digital Voltmeter (DVM) PCB Test Routine

The following steps can help determine if the DVM circuitry is faulty:

1) Short the output leads.

2) Check for a reading of 0.000.

3) Put the output leads across a 0.100 Ω resistance standard.

4) The display should read 100.00 mΩ (± 10 counts depending on the resistor's

accuracy).

If the above test proves untrue, then the DVM circuitry is possibly faulty, and may need

replacing. See section E-2 on page 13 for more information about sending your product

in for repair.

E-7 620UK-B Calibration Procedure

The 620UK-B's rear panel calibration sticker must be removed to access the two

adjustment potentiometers located on the DVM PCB. Please note that if the tamper-

proof calibration sticker is removed, this voids the product's calibration and

warranty.

All the meter's calibration adjustments (via trimpots) are accessed through two holes

located in the upper right area of the rear panel, under the tamper-proof calibration

sticker. The two holes (see diagram below) are for zero and full-scale adjustments. A

set of two hole plugs normally cover the zero and full-scale adjustment holes.

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