The Yokogawa 7555 is a 5.5-digit digital multimeter engineered for precision measurement across DC voltage, AC voltage, 2-wire and 4-wire resistance, DC current, and AC current. Its high-resolution display reads up to 199999 with a sampling rate of 125 times per second, capturing dynamic signals with accuracy specifications tailored to measurement function, range, sampling mode, and environmental conditions. The instrument integrates 2000-item internal memory for measurement data storage plus ten setup configurations, making it suitable for both benchtop and automated system deployment.
Technical Specifications
Display & Resolution
• 5.5-digit display
• Maximum reading: 199999
Measurement Functions
• DC Voltage (DCV)
• AC Voltage (ACV)
• 2-wire Resistance (Ω2W)
• 4-wire Resistance (Ω4W)
• DC Current (DCA)
• AC Current (ACA)
Sampling Performance
• Up to 125 times/second
• Selectable modes: SLOW, MID2, MID1, FAST
Rejection Characteristics
• Common mode rejection ratio: ≥120 dB (SLOW/MID2/MID1 modes, 50/60 Hz ±0.1%, Rs = 1 kΩ)
• Normal mode rejection ratio: ≥60 dB (SLOW/MID2/MID1 modes, 50/60 Hz ±0.1%)
Memory
• Data storage: 2000 measurement items
• Setup storage: 10 configuration sets
– Key Features
Extended Current Measurement — With optional current clamp (751106): 200 A DC and 150 A AC capability.
Multi-Point Measurement — Optional simple scanner supports up to 8 channels for DC voltage measurement, featuring photo MOS relay construction and removable terminal block for field wiring.
Data Output Options — BCD parallel output delivers measurement data including decimal point, unit, polarity, and over-range status for direct controller integration.
– Compatibility & Integration
Standard Interface: RS-232-C
Optional Interface: GP-IB
Status: This instrument has been discontinued. The DM7560 Digital Multimeter (6.5-digit) is the successor model.
