Keithley 197A Autoranging Microvolt DMM
The Keithley 197A is a reliable autoranging digital multimeter designed for precision microvolt measurements. It offers high accuracy and stability for a variety of electronic testing and measurement applications. Known for its solid construction and ease of use, it is suitable for both benchtop and field use.
- Model
- Keithley 197A
- Calibration
- Available on request
- Price
- $690
- Status
- In stock
- RFQ ref
- 197A
This unit
The Keithley 197A is a 5½-digit autoranging microvolt DMM delivering precision measurements across voltage, current, resistance, and specialized functions. With ±220,000-count resolution and sensitivities to 1µV, 1nA, and 1mΩ, it addresses demanding benchtop and field applications requiring high accuracy and stability. The backlit LCD display indicates polarity, function, range, and status, while autoranging capability (300ms average per range) and manual mode options provide measurement flexibility across nine distinct functions.
Technical Specifications Display & Resolution
±220,000-count backlit LCD, 0.45 inches high
Resolution: 1µV to 10mV (voltage); 1nA to 100µA (current); 1mΩ to 10kΩ (resistance) Voltage Measurement
DC ranges: 200mV to 1000V; AC ranges: 200mV to 750V
DC accuracy: 0.011% ±2 counts (2V range, 1 year)
AC accuracy (True RMS, 50Hz–10kHz): 0.35% + 100 counts; 5% + 400 counts (50kHz–100kHz, higher ranges)
Input resistance: >1 GΩ (200mV, 2V ranges); 11MΩ to 10MΩ (higher ranges)
Maximum input: 1000V DC or peak AC
3dB bandwidth (AC): 300kHz typical Current Measurement
Ranges: 1nA to 10A
DC/AC accuracy: 0.2% + 15 counts (200µA–200mA); 0.5% + 15 counts (10A)
Overload protection: 2A fuse (250V), externally accessible Resistance Measurement
Ranges: 1mΩ to 220MΩ
Automatic 2- or 4-terminal configuration
Accuracy: 0.01% + 2 counts (200Ω range); 2.00% + 1 count (200MΩ range, 1 year, 22°–24°C)
Test current: 2mA nominal; open circuit voltage: +5V Additional Functions
True RMS AC measurement to 100kHz
Diode test (junction voltage to 2.2V; 1.6mA test current)
dB mode with selectable impedance: 50, 75, 93, 135, 300, 600 ohms
Data logging: 100-point storage, rates from 3/second to 1/hour
Min/Max detection and storage
Relative mode with pushbutton zeroing Environmental
Operating: 0° to 50°C; <80% RH (≤35°C); linearly derated 3%/°C (35°–50°C)
Storage: -40° to +70°C
Warm-up: 1 hour to rated accuracy
Key Features
Autoranging (DC volts, AC volts, ohms) or manual mode
Exceptional low-voltage sensitivity: 1µV resolution
Nanoampere-level current measurement capability
Selectable data logging with continuous min/max tracking
High input impedance minimizes loading errors
Portable design with optional battery pack for field deployment
Typical Applications
Precision DC and AC measurement in R&D and manufacturing
Sensor and transducer characterization
Low-level signal detection in electronic circuits
Temperature coefficient and drift analysis
Resistance measurement from milliohm to megohm scales
Diode junction voltage verification
Compatibility & Integration Manual and autoranging modes support diverse measurement workflows. Relative mode enables differential testing against reference baselines. The 100-point logger accommodates process monitoring and trend analysis without external data acquisition hardware.
Specifications
| Parameter | Value |
|---|---|
| Power Range (dBm) | above –78 dBm | Voltage / Current Range: 1000 V DC |
Keithley 197A — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Keithley 197A. Calibration covers DC voltage accuracy at all ranges, AC voltage (True RMS) accuracy at 50 Hz, 1 kHz, and 10 kHz, DC current accuracy, resistance accuracy at all decade ranges, frequency accuracy, and diode test voltage. Fluke 87V and 289 also include capacitance and temperature calibration.. All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Keithley 197A faults: blown input fuse, worn input jacks, display segment failure, relay contact wear on bench DMMs. Common faults include worn input jacks (banana socket contact wear on the mA and COM terminals), blown input fuses (especially the 440 mA HRC fuse), and display segment failures. Keithley 2000/2001/2002 bench DMMs commonly develop relay contact wear affecting resistance accuracy after extended service.
Keithley 197A price
This Keithley 197A is listed at $690. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Keithley 197A calibration cost
NIST-traceable calibration for the Keithley 197A is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Calibration for this instrument covers DC voltage accuracy at all ranges, AC voltage (True RMS) accuracy at 50 Hz, 1 kHz, and 10 kHz, DC current accuracy, resistance accuracy at all decade ranges, frequency accuracy, and diode test voltage. Fluke 87V and 289 also include capacitance and temperature calibration.. Turnaround is 1 to 3 business days after receipt. See full calibration details →
