The Sanwa CD800a2 is an authentic, high-precision industrial-grade digital multimeter (DMM) engineered by Japan's leading instrument manufacturer, Sanwa Electric Instrument Co., Ltd. Serving as the direct successor to the legendary CD800a, the CD800a2 retains the signature integrated protective hard-case clamshell design while offering upgraded safety ratings, improved LCD contrast, and robust overload protection circuits. It is widely considered an essential tool for electronic bench testing, electrical maintenance, field engineering, and technical education.

Specification

• Brand / Origin: Sanwa Electric Instrument Co Ltd (Japan)
• Model Designation: CD800a2
• Display Output: 3-3/4 Digits, 4000-Count High-Contrast LCD Screen
• Sampling Conversion Rate: Approximately 2 to 3 times per second
• DC Voltage Measurement:
  • Ranges: 400mV / 4V / 40V / 400V / 1000V
  • Best Accuracy: ± (0.7\% + 3 digits)
• AC Voltage Measurement:
  • Ranges: 4V / 40V / 400V / 1000V
  • Frequency Bandwidth: 40Hz - 400Hz
  • Best Accuracy: ± (1.6% + 5 digits)
• DC / AC Current Measurement:
  • Ranges: 40mA / 400mA (Micro/Milliamp precision tracking)
  • Best Accuracy: ± (1.4% + 3 digits)
  • Note: Unfused high-current (10A) terminal omitted for enhanced safety against low-impedance shorts
• Resistance Measurement: 400Ω / 4kΩ / 40kΩ / 400kΩ / 4MΩ / 40MΩ
• Capacitance Measurement: 50nF / 500nF / 5μF / 50μF / 100μF
• Frequency Measurement: 5Hz up to 100kHz
• Duty Cycle Tracking: 20% - 80%
• Continuity & Diode Testing: Fast audible continuity buzzer (threshold approx 10Ω to 120Ω) + Open-circuit diode test voltage (approx 1.5V)
• Safety Category Rating: IEC 61010-1 CAT III 600V / CAT II 1000V
• Power Source: 2 x AA 1.5V Batteries (Includes Auto Power Save after approx 30 minutes idle)
• Body Form Factor: Integrated hard clamshell protection cover with built-in test lead storage compartment

Features

• All-in-One Protective Clamshell Housing: Features a permanently hinged, heavy-duty cover that snaps shut to shield the LCD glass and rotary range switch from physical impact during transit. When opened, the cover tilts back to double as an adjustable desk tilt-stand.
• Gold-Plated Fixed Test Leads: The heavy-duty gold-plated probe tips resist oxidation and wear, guaranteeing low contact resistance over years of daily use. The leads are hardwired directly into the interior housing to prevent accidental probe disconnects or loose socket wear.
• High-Level Electrical Overload Protection: Outfitted with ceramic safety fuses, PTC thermistor clamping components, and varistors rated to withstand high transient voltage spikes without exploding or arc-flashing.
• Auto-Ranging with Manual Hold Functions: Automatically selects the optimal measurement range for unknown circuits while offering manual Range Hold and Data Hold options for capturing measurements in tight quarters.

Common Applications

• Precision Electronics Servicing: Measuring microamp current draws, diode forward voltages, and precise resistor networks on PCB surface-mount components.
• HVAC & Industrial Electrical Troubleshooting: Inspecting relay coil voltages, control loop signals, transformer windings, and motor start capacitors.
• Automotive & Solar Telemetry: Reading battery terminal voltages, tracking solar panel outputs, and checking sensor continuity across vehicle wiring harnesses.
• Academic & Engineering Laboratories: Used as a standardized, durable measurement tool for students and engineering bench technicians.

Professional Usage & Safety Tips

• Identify Genuine Sanwa Products vs. Counterfeits: Authenticate your meter by checking for the crisp, high-relief "Sanwa" logo embossed into the outer body shell, gold-plated probe tips, laser-sharp LCD text, clear CAT III safety markings, and the official Japanese factory quality inspection sticker inside the battery compartment.
• Store Test Leads Safely: When closing the clamshell cover, wrap the fixed test lead cables neatly around the perimeter slots provided in the case. Avoid bending the wires sharply right where they enter the meter body to prevent internal copper fatigue over time.
• Keep Batteries Fresh to Prevent Leaks: If storing the multimeter unused for extended periods, remove the AA batteries. Alkaline battery leaks can corrode the spring contacts and internal motherboard traces, voiding the warranty.
• Understand the Current Range Limits: The CD800a2 is intentionally designed without an unfused 10A high-current jack to maximize operator safety. Do not attempt to measure heavy mains load currents exceeding 400mA through the probe tips, as doing so will trip the internal ceramic protection fuse.