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619

KeithleyElectrometers

The Keithley 619 is a highly versatile 5½-digit electrometer and digital multimeter (DMM) designed for sensitive voltage, current, and resistance measurements. Configurable as a single- or dual-channel instrument, it offers exceptional input impedance and low bias current, making it ideal for semiconductor characterization, research, and high-impedance material testing.

Current MeasurementResistance MeasurementSemiconductor TestingVoltage Measurement

Specifications

General

ParameterValue
InterfacesOptional GPIB (IEEE-488) interface via Model 6193 plug-in card
Display5½-digit LED display with exponent and function indicators

Physical

ParameterValue
Power Supply90-125 V or 180-250 V AC (rear-panel switch selectable), 50-60 Hz, 45 VA maximum
Operating Temperature0°C to 50°C
Dimensions (W×H×D)127 mm H × 216 mm W × 359 mm D (5.0 in × 8.5 in × 14.1 in)
Weight4.1 kg

DC Voltage Measurements

ParameterValue
DC Voltage Ranges200 mV, 2 V, 20 V, 200 V
DC Voltage Resolution1 µV on 200 mV range, 10 µV on 2 V range, 100 µV on 20 V range, 1 mV on 200 V range
Input Resistance> 2 × 10^14 ohms in parallel with < 20 pF on 200 mV and 2 V ranges
Input Bias Current< 400 fA (0.4 pA) at 23°C

DC Current (Picoammeter) Measurements

ParameterValue
DC Current Ranges2 nA, 20 nA, 200 nA, 2 µA, 20 µA, 200 µA, 2 mA
DC Current Resolution10 fA on 2 nA range, 100 fA on 20 nA range
Input Voltage Burden< 1 mV max (< 100 µV typical on lower ranges)

Resistance Measurements

ParameterValue
Resistance Ranges2 kOhm to 200 GOhm (extendable up to 2 TOhm in ratiometric mode)
Resistance Resolution10 mOhm on 2 kOhm range

Input/Output and Connectivity

ParameterValue
Input Connectors TypeTriaxial connectors (one per channel)
Analog Output Range1 V for full-scale (100,000 counts) deflection

Measurement Dynamics and Noise Performance

ParameterValue
Normal Mode Rejection Ratio (NMRR)> 55 dB at 50 Hz or 60 Hz
Common Mode Rejection Ratio (CMRR)> 100 dB at DC, 50 Hz or 60 Hz

General Specifications

ParameterValue
Operating Humidity0% to 70% relative humidity up to 35°C
Storage Temperature-25°C to 65°C
Warm-up Time1 hour to rated accuracy
Channel Configuration OptionsSingle channel (standard) or dual channel electrometer configuration
Model 6191 OptionSingle-channel electrometer input plug-in card

Safety & Isolation

ParameterValue
Maximum Common Mode Voltage500V peak
Input LO to Chassis Isolation>10^10 ohms in parallel with <1000 pF

Measurement Performance

ParameterValue
A/D Converter Integration Time33.3 ms at 60 Hz, 40 ms at 50 Hz
Input Guarding ModeSwitch-selectable triaxial guard (Input LO or Preamp Guard)

Power

ParameterValue
Line Voltage Selections100V, 120V, 220V, 240V (rear panel switchable, ±10%)

Protection

ParameterValue
Maximum Input Overload (Voltage)250V rms, 350V peak continuous
Maximum Input Overload (Current)250V rms on 2 nA to 2 uA ranges; 100 mA on 20 uA to 2 mA ranges
Maximum Input Overload (Resistance)250V rms continuous

Connectivity

ParameterValue
GPIB Interface FunctionsSH1, AH1, T5, TE0, L4, LE0, SR1, RL1, PP0, DC1, DT1, C0 (with Option 6193)

Control

ParameterValue
Zero Check FunctionFront panel switchable
Ranging ModesManual or Auto-ranging

Display

ParameterValue
Resolution Selection4½-digit or 5½-digit (selectable via front panel or GPIB)

Performance

ParameterValue
A/D Converter TypeDual-slope integrating

Outputs

ParameterValue
Analog Output Impedance1 kΩ

Options

ParameterValue
IEEE-488 Interface OptionModel 6193
Rack Mount Kit AccessoryModel 1019

Technology

Solid-state digital electrometer with dual-channel electrometer option

Applications

High-impedance voltage measurement, picoampere current measurement, high-resistance testing, and material characterization