The Keysight (Agilent/HP) 34420A is a high-performance 7 1/2-digit nanoVolt/micro-Ohm meter engineered for highly sensitive, low-level measurements. Delivering exceptional noise performance of 1.3 nVrms / 8 nVpp and extremely fine resolution down to 100 pV and 100 nOhm, it is optimized for demanding metrology, dry circuit testing, and high-precision temperature measurements using direct SPRT, RTD, thermistor, and thermocouple sensors.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | RS-232, GPIB |
| Display | 7 1/2 Digits |
| Included Input Cable | Keysight 34102A Low-Thermal Input Cable |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100V / 120V / 220V / 240V ±10%, 45-66 Hz and 360-440 Hz, 25 VA max |
| Operating Temperature | 0 to 55 |
| Dimensions (W×H×D) | 254.4 × 103.6 × 374 (with bumpers) / 212.8 × 88.5 × 348.3 (without bumpers) |
Measurement Characteristics
| Parameter | Value |
|---|---|
| Resolution (Digits) | 7 1/2 digits |
| Measurement Modes | DC Voltage, Resistance, Temperature |
DC Voltage Specifications
| Parameter | Value |
|---|---|
| Maximum Resolution | 100 pV |
| RMS Noise | 1.3 nVrms |
| Peak-to-Peak Noise | 8 nVpp |
| Accuracy (24-Hour) | 2 ppm (basic DCV) |
Resistance Specifications
| Parameter | Value |
|---|---|
| Measurement Configuration | 3 built-in resistance functions (including low power, dry circuit testing) |
| Dry Circuit Test Voltage Limit | 20 mV |
| Maximum Test Current (Resistance) | 10 mA (on 1 Ω range) |
| Offset-Compensated Ohms | Supported (removes thermal EMF errors) |
Temperature Specifications
| Parameter | Value |
|---|---|
| Supported Sensor Types | SPRT, RTD, Thermistor, Thermocouple |
| Supported Thermocouple Types | B, E, J, K, N, R, S, T |
Math and Filtering
| Parameter | Value |
|---|---|
| Math Functions | Scaling, Statistics |
| Filtering | Selectable analog and digital filtering |
| Analog Output | Chart recorder analog output |
Input / Output and Connectivity
| Parameter | Value |
|---|---|
| Input Terminals | Shielded, copper pin connector |
| Built-in Scanners | Built-in low noise 2-channel scanners |
| Command Language Compatibility | SCPI, Keithley 181 |
Measurement Capabilities
| Parameter | Value |
|---|---|
| Voltage Ranges | 1 mV to 100 V |
| Resistance Ranges | 1 Ω to 1 MΩ |
Inputs & Protection
| Parameter | Value |
|---|---|
| Input Resistance (1 mV to 10 V ranges) | > 10 GΩ |
| Input Resistance (100 V range) | 10 MΩ ± 1% |
| Maximum Input Voltage | 150 V peak to any terminal |
Performance
| Parameter | Value |
|---|---|
| Maximum Reading Rate | 250 readings/second (at 4.5 digits) |
| Integration Times (NPLC) | 0.02, 0.2, 1, 10, 100, 200 NPLC |
| Common Mode Rejection Ratio (CMRR) | 140 dB (DC, 1 kΩ unbalance) |
| Normal Mode Rejection Ratio (NMRR) | 60 dB (at 50/60 Hz ±0.1%, ≥1 NPLC) |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40°C to 75°C |
| Operating Humidity | < 95% RH up to 40°C |
Inputs
| Parameter | Value |
|---|---|
| Input Channels | 2 (CH1 and CH2) with built-in low-thermal scanner |
Technology
Digital Multimeter (DMM) / Nanovoltmeter
Applications
Low-level voltage measurement, precision resistance testing, dry circuit testing, thermometry (SPRT, RTD, Thermocouple)