HTC Instruments DM-91 Terminal Inter Lock Digital Multimeter

HTC Instruments DM-91 Terminal Inter Lock Digital Multimeter

The HTC Instruments DM-91 is a robust and versatile 3½-digit manual-ranging digital multimeter designed for professionals and enthusiasts in electronics, electrical, and industrial sectors. With a 1,999-count LCD display and terminal shutter interlock mechanism, it ensures accurate and safe measurements across a wide range of electrical parameters.

🔑 Key Features

• 3½-Digit Manual Multimeter: Offers a 1,999-count resolution for precise measurements.

• Terminal Shutter Interlock Mechanism: Prevents incorrect connections by ensuring the red lead is connected to the appropriate terminal before measurement.

• Auto Power Off: Conserves battery life by automatically turning off the device after a period of inactivity.

• Backlit LCD Display: Provides clear visibility in low-light conditions.

• Transistor Testing: Tests hFE of NPN and PNP transistors.

• Diode and Continuity Testing: Checks diodes and continuity with audible indication.

• Capacitance Measurement: Measures capacitance up to 200µF.

• Frequency Measurement: Measures frequencies up to 10MHz.

• Temperature Measurement: Measures temperature using a Type-K thermocouple.

• Low Battery Indication: Alerts when the battery voltage drops below 7.5V.

• Anti-Shock Protection: Built-in protection to prevent damage from accidental shocks.

📊 Specifications

• DC Voltage Range: 200mV to 1000V

• AC Voltage Range: 2V to 700V

• DC Current Range: 20µA to 10A

• AC Current Range: 20mA to 10A

• Resistance Range: 200Ω to 200MΩ

• Capacitance Range: 2nF to 200µF

• Frequency Range: 40Hz to 10MHz

• Temperature Range: -40°C to 1000°C

• Display: 3½-digit, 1,999-count LCD with backlight

• Sampling Rate: Approximately 3 times per second

• Power Supply: 1 x 9V battery (6F22)

• Dimensions: 190 x 90 x 40 mm

• Weight: Approximately 300g

• Safety Rating: CAT II 1000V

🛠️ Applications

• Electrical Troubleshooting: Ideal for diagnosing issues in electrical circuits and components.

• Electronics Repair: Useful for testing and repairing electronic devices.

• HVAC Systems: Suitable for testing and maintaining HVAC control systems.

• Industrial Equipment: Perfect for servicing industrial equipment and machinery.

• Educational Use: Great for teaching and learning about electrical measurements and concepts.

• DIY Projects: Perfect for hobbyists working on various electronic projects.

  – DC Voltage: 200mV/2V/20V/200V/1000V, ±(0.5% + 1d)±(0.5% + 3d), ±(0.8% +3d)
  – AC Voltage: 2V/20V/200V/700V, ±(1.0% + 5d), ±(1.2% + 5d)
  – DC Current: 20µA/2mA/200mA/10A, ±(1.2% + 3d)/±(1% + 3d), ±(1.5% + 5d)/±(2.0% +10d)
  – AC current: 20mA/200mA/10A, ±(1.2% + 5d)/±(2.0% + 5d), ±(3% + 10d)
  – Resistance: 200/2k /20k /200k , 20M /200M, ±(1.0% + 10d)/±(1% + 1d), ±(1% + 5d) , ±[5.0% (rdg-10d) + 20d]
  – Capacitance: 2nF/200nF/2µF/200 µf, ±(4% + 3d)/±(5% + 3d)
  – Frequency testing: 200KHz, ±(1.5% + 10 digits)
  – Temperature: -20C to 1000C,
  – Power: 9V (6F22)