Tektronix 197A Multimeter, 5.5 Digit

The Tektronix 197A is a 5.5-digit multimeter engineered for precision DC and AC voltage, current, and resistance measurements in laboratory and field environments. Its backlit LCD display resolves ±220,000 counts with 0.45-inch digit height, delivering clear indication of polarity, function, range, and instrument status. Auto-ranging operates across DC volts, AC volts, and resistance; manual ranging applies to AC and DC current modes. The instrument captures up to 100 readings via data logging at selectable rates or manual trigger, with MIN/MAX storage and relative measurement mode for baseline zeroing.

– Technical Specifications

Display & Resolution
• Backlit LCD with ±220,000 count maximum
• Digit height: 0.45 inches
• Status indication: polarity, function, range, operating mode

DC Voltage
• Ranges: 200 mV, 2 V, 20 V, 200 V, 1000 V
• Resolution: 1 µV (200 mV range)
• Input resistance: >1 GΩ (200 mV, 2 V ranges); 10 MΩ (20 V–1000 V ranges)
• Accuracy (24 hr, 22°–24°C): ±(0.005% to 0.007% of reading + 2–3 counts) depending on range
• Accuracy (1 year, 18°–28°C): ±(0.011% to 0.016% of reading + 2–3 counts) depending on range
• Maximum allowable input: 1000 V DC or peak AC (300 V rms continuous; 60 dB at 50 Hz, 60 Hz ±0.1%
• Settling time: 1 second to within 3 counts

AC Voltage
• Common mode rejection ratio (1 kΩ unbalance): >60 dB

Resistance
• Auto or manual ranging
• Settling time: 2 seconds to within 3 counts

Current Measurements
• Manual ranging for AC and DC current

dBm Measurement
• Accuracy: ±(0.02 dB + 1 count) above –78 dBm
• Resolution: 0.01 dB above 0.7% of range
• Reference impedance (front panel selectable): 50 Ω, 75 Ω, 93 Ω, 135 Ω, 300 Ω, 600 Ω

– Key Features

• Data logging with up to 100 stored readings
• Selectable logging rate or manual trigger capture
• MIN/MAX storage for statistical analysis
• Relative measurement mode for differential testing
• Auto-ranging on voltage and resistance functions

– Typical Applications

Benchtop and field troubleshooting, component characterization, signal integrity verification, RF impedance analysis via dBm measurement with user-configurable reference impedance.