The Keithley 195A is a 5.5-digit digital multimeter delivering high-resolution electrical measurements across DC voltage, resistance, and—with the 1950 AC Option—AC voltage and DC current. Manual or fast autoranging (150ms per range change on DCV) enables rapid measurement cycles, while a standard GPIB interface integrates directly into automated test systems. The instrument achieves 200,000-count resolution on a LED display and stabilizes to rated accuracy within 1 hour of warmup.
Technical Specifications
Measurement Ranges & Accuracy
• DC Voltage: 20mV to 1000V full scale; ±(0.025% reading + 6–8 counts) depending on range
• AC Voltage (1950 Option): 200mV to 700V; ±(0.3% reading + 200 counts) at 45Hz–10kHz, True RMS response
• Resistance: 20Ω to 20MΩ across seven ranges; ±(0.022–0.050% reading + 5–25 counts); automatic 2- or 4-terminal configuration
• DC Current (1950 Option): 20µA to 2A; resolution from 100pA full scale
• AC Current (1950 Option): 1nA to 2A, True RMS
Input Characteristics
• DC Voltage Input Impedance: >1 GΩ (10 MΩ on 20V and above ranges)
• AC Voltage Input Impedance: 2 MΩ shunted by <75 pF; bandwidth -3 dB at 250 kHz typical
• Maximum Input: 1000V peak (DC and AC); AC also limited to 107 V·Hz
• Crest Factor: Up to 3:1 allowable for AC measurements
Environmental & Physical
• Operating: 0°C to 50°C, 0–80% RH (to 35°C)
• Storage: -25°C to 65°C
• Power: 105–125V or 210–250V selectable, 50–400 Hz, 24 VA maximum
• Dimensions: 127 mm H × 216 mm W × 359 mm D
• Weight: 3.2 kg
– Key Features
• 5.5-digit LED display (200,000 counts)
• Fast autoranging with 150 ms per-range settling on DCV
• True RMS AC measurements with AC coupling
• Automatic 2- and 4-terminal resistance measurement
• Temperature coefficient: <±(0.1 × accuracy)/°C across 0–18°C and 28–50°C
• Reading rate: 3 readings/second (1 reading/second on 20 MΩ range)
– Typical Applications
• Electronics assembly and component validation
• Laboratory bench testing and general electrical measurement
• Automated test system integration via GPIB
– Compatibility & Integration
Standard GPIB interface supports integration into ATE platforms. 90–110 V and 180–220 V power supply versions available on request.
