Identification Methods—General Quality Identification Methods for Electrical Test Equipment 

  General Quality Identification Methods for Electrical Test Equipment

    1. Appearance

    a. Chassis material:

    Aluminum alloy chassis come in two types: all-aluminum and aluminum-clad. The two look similar, but their durability differs greatly; all-aluminum chassis are more sturdy than aluminum-clad ones. You can distinguish them by looking at the fan holes, ventilation holes, etc.

    b. Panel:

    The panel should be aesthetically pleasing, with evenly distributed background color, smooth membrane, and good tactile feedback for the keys.

    c. Size and weight:

    Instruments that are smaller and lighter are more portable; due to higher integration, they are generally more advanced and more reliable.

    2. Function

    a. Microcomputer interface:

    Generally, instruments with a microcomputer interface have a 9-pin socket on the panel, which should be marked with "RS232" or similar. Users may not need it now, but if they want to use a computer to manage data in the future, an RS232 interface is essential.

    b. Display method:

    Common types include LED (segment light-emitting diode), LCD (segment liquid crystal display), and graphic LCD (can display Chinese characters, graphics), etc. Users can choose according to their needs, but it is worth noting that a larger graphic LCD is not necessarily better; since the LCD is a relatively fragile component, large-screen LCDs have poor vibration resistance and higher failure rates.

    c. Printing function:

    Instruments with a built-in micro printer can record test data on site, which is convenient to use.

    d. Clock function:

It can record and print test time, which is particularly important for projects that require longitudinal comparison of historical data.

    e. Data storage:

    Users may care about the storage capacity and whether the indexing method is convenient.

     f. Upgrade capability:

    Instruments with a JTAG in-circuit programming interface can be upgraded online without opening the panel.

    g. Human-machine interaction interface:

    Is the menu displayed in Chinese? Is the menu design reasonable? Is there a beep when keys are pressed? Does it alarm when errors occur?

    h. LCD contrast adjustment: