Used for measuring actual sound pressure levels, typically for machine motors or engine analysis. 2. Response Time Selection
| Component | Function | |-----------|----------| | LCD Display | 6000-count backlit screen with high-voltage warning icon | | Rotary Switch | Selects function: OFF, AC/DC V, Ω continuity, Insulation 250/500/1000/2500V | | TEST Button | Press and hold to start insulation resistance measurement | | LOCK Button | Locks TEST on for hands-free continuous measurement | | HOLD Button | Freezes current reading on display | | Backlight Button | Illuminates display for 30 seconds | | V/Alerts Input | Positive (+) terminal for voltage/continuity | | INSUL Input | High-voltage output terminal (line) | | COM Input | Common (ground) terminal | | Guard Terminal | Reduces surface leakage on long cables |
1/2-inch polarized capacitive electric condenser microphone. Operating Instructions 1. Basic Measurement
When you invest in a precision tool like the —a high-performance digital insulation resistance tester (megohmmeter)—having the manual at your fingertips is essential. Whether you lost the original paper copy, need a digital reference, or want to understand the device beyond the basic diagrams, this guide serves as an extended, searchable manual for the Protmex PT6708.
±1.5 dB (standard sound pressure, 94 dB @ 1 kHz). Frequency Response: 30 Hz to 8 kHz. Resolution: 0.1 dB with a 4-digit LCD display. Response Time: Fast (0.125s) and Slow (1s) modes. Weighting: A and C frequency weighting networks.
Readings vary with temperature and humidity. According to industry standards (IEEE 43), correct the reading using temperature coefficients typically listed in the Protmex PT6708 manual appendix.
To begin a measurement, turn on the device. The large LCD will display current decibel levels and a high-speed analog bar graph that updates every 40 milliseconds to show varying noise trends.