Laboratory equipment typically requires maintenance every three months, especially for precision instruments. For devices with rechargeable batteries, it is recommended to charge them every three months to prevent battery damage. Different instruments have varying maintenance procedures. Depending on their specific characteristics, measures such as dust-proofing, shock-proofing, and corrosion prevention should be adopted. For detailed maintenance instructions and usage frequency, please refer to the user manuals provided with each instrument.

Electrical Equipment Maintenance Principles

First, talk the talk before walking the walk.

For malfunctioning electrical equipment, do not act in haste. First, inquire about the preceding and subsequent faults and the symptoms observed. With unfamiliar equipment, it is crucial to first familiarize yourself with the circuit principles and structural characteristics, and adhere to the relevant rules. Before disassembly, thoroughly understand the functions, positions, connection methods, and relationships of the various electrical components, as well as their interactions with other surrounding devices. In the absence of assembly diagrams, sketch and mark as you disassemble.

2. Prioritize international over domestic

First, inspect for any visible cracks or defects in the equipment, understand its maintenance history and lifespan, and then check the machine's interior. Prior to dismantling, prioritize and identify surrounding fault factors. Equipment can only be removed if internal issues are confirmed. Otherwise, blind dismantling may worsen the condition of the equipment.

3. Mechanical first, then electrical

Only proceed with electrical inspections after confirming that the mechanical components are free of malfunctions. When checking for circuit faults, use testing equipment to locate the fault. After confirming there are no contact不良 issues, check the operational relationship between the wiring and the mechanics specifically to avoid misjudgments.

4. First static, then dynamic

When the equipment is not powered on, assess the quality of the electrical equipment's buttons, contactors, thermal relays, and fuses to determine the fault. Conduct powered tests by listening to the sound, measuring parameters, and identifying the fault, followed by repairs. For instance, if a motor is out of phase and the three-phase voltage values cannot be accurately determined, listen to the sound and measure each phase's voltage separately to identify which phase is defective.

5. Pre-repair Cleaning

For heavily polluted electrical equipment, first clean the buttons, wiring points, and contacts. Check if the external control keys are malfunctioning. Many issues are caused by dirt and conductive dust, which are often resolved with a simple cleaning.

6. Power supply before equipment

Fault rates in the power section are relatively high among all faulty equipment, thus, it is often the first to be inspected; this approach can achieve twice the result with half the effort.

7. General first, then special

Faults caused by poor quality of assembled parts or other equipment malfunctions typically account for about 50% of common faults. Special faults of electrical equipment are often soft faults, which should be measured and repaired based on experience and instruments.

8. Prioritize peripheral over central

Do not rush to replace damaged electrical components; consider doing so only after confirming that the peripheral circuit is functioning normally.

9. Initially direct current, then alternating current

During maintenance, it is essential to first check the DC circuit's static operating point, followed by the AC circuit's dynamic operating point.