The Keithley 2657A is a high-power, high-voltage System SourceMeter (SMU) instrument designed for characterizing and testing high-voltage electronics and power semiconductors. Operating up to 3000 V and delivering up to 180 W of power, it features dual 18-bit 1 MHz digitizing A/D converters for high-speed, simultaneous voltage and current measurements.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB, LAN (LXI Class C), USB 2.0, TSP-Link, Digital I/O (14-pin), Safety Interlock |
| Display | Dual-line Vacuum Fluorescent Display (VFD) |
| Warm-up Time | 2 hours to rated accuracy |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100 V to 240 V AC, 50 Hz to 60 Hz, 350 VA maximum |
| Operating Temperature | 0 °C to 50 °C |
| Dimensions (W×H×D) | 213 mm × 89 mm × 512 mm |
| Weight | 9.9 kg |
| Rack Unit Height | 2U |
Core Signal and Electrical Performance
| Parameter | Value |
|---|---|
| Maximum Output Voltage | 3000 V |
| Maximum Output Current | 120 mA |
| Maximum Output Power | 180 W |
| Voltage Source Ranges | 200 V, 500 V, 1500 V, 3000 V |
| Voltage Measure Ranges | 200 V, 500 V, 1500 V, 3000 V |
| Current Source Ranges | 1 nA, 10 nA, 100 nA, 1 µA, 10 µA, 100 µA, 1 mA, 10 mA, 120 mA |
| Current Measure Ranges | 1 nA, 10 nA, 100 nA, 1 µA, 10 µA, 100 µA, 1 mA, 10 mA, 120 mA |
| Current Measurement Resolution | 1 fA (on 1 nA range) |
| Voltage Measurement Resolution | 100 µV (on 200 V range) |
| Sensing Modes | 2-wire, 4-wire (remote sense), and Active Guarding |
Measurement Capabilities and Timing
| Parameter | Value |
|---|---|
| A/D Converter Resolution | Dual 18-bit |
| Maximum Sampling Rate | 1 MHz (1 µs per point) |
| Buffer Reading Capacity | More than 140,000 readings |
Connectivity, Ports, and Interfaces
| Parameter | Value |
|---|---|
| Primary RF Connector Type | High Voltage Triaxial (3-lug) on rear panel |
| Safety Interlock | 3-pin rear panel terminal connector |
| TSP-Link Interface | Dual RJ-45 connectors for master/slave expansion |
| Digital I/O Port | 14-pin female D-sub connector with 7 configurable digital I/O lines |
User Interface and Software Control
| Parameter | Value |
|---|---|
| Programming Language Compatibility | TSP (Test Script Processor), SCPI command emulation |
Environmental and Compliance Standards
| Parameter | Value |
|---|---|
| Storage Temperature Range | -25 °C to 65 °C |
Physical and Mechanical Attributes
| Parameter | Value |
|---|---|
| Cooling Method | Forced air cooling (internal fan) |
| Form Factor | Benchtop or Rackmount (2U height, half-rack width) |
Electrical Safety & Isolation
| Parameter | Value |
|---|---|
| Maximum Common Mode Voltage | 250 V DC (LO to chassis ground) |
Guard
| Parameter | Value |
|---|---|
| Guard Offset Voltage | < 100 µV |
| Maximum Guard Current | 100 µA (limited by internal 100 kΩ resistor) |
Environmental
| Parameter | Value |
|---|---|
| Operating Humidity | 5% to 60% RH, non-condensing (up to 35°C; derated by 3% RH/°C from 35°C to 50°C) |
| Storage Humidity | 5% to 90% RH, non-condensing (0°C to 50°C) |
| Maximum Altitude | 2000 m (6562 ft) above sea level |
| Vibration | MIL-PRF-28800F Class 3 Random |
Compliance
| Parameter | Value |
|---|---|
| Safety Compliance | UL 61010-1:2004, CAN/CSA-C22.2 No. 61010-1-04, EN 61010-1:2001 |
| EMC Compliance | Conforms to European Union Directive 2004/108/EEC, EN 61326-1:2006 |
Source Specifications
| Parameter | Value |
|---|---|
| Voltage Source Programming Resolution | 5 mV to 80 mV (range dependent) |
| Current Source Programming Resolution | 20 fA to 2 µA (range dependent) |
| Voltage Source Accuracy | ±(0.03% + 50 mV to 750 mV) (range dependent) |
| Current Source Accuracy | ±(0.03% to 0.15% + offset) (range dependent) |
| Source D/A Converter Resolution | 18-bit |
| Voltage Compliance Limit Range | 30 V to 3030 V |
| Current Compliance Limit Range | 1 nA to 120 mA |
Measurement Specifications
| Parameter | Value |
|---|---|
| Voltage Measurement Accuracy | ±(0.02% + 50 mV to 700 mV) (range dependent) |
| Current Measurement Accuracy | ±(0.025% to 0.15% + offset) (range dependent) |
| Measurement ADC Types | 22-bit integrating ADC and 18-bit digitizing ADC |
| Maximum Remote Sense Lead Drop | 3 V (maximum drop between force and sense leads) |
Protection
| Parameter | Value |
|---|---|
| Overvoltage Protection | Programmable from 30 V to 3000 V |
Connections
| Parameter | Value |
|---|---|
| Output Connectors | Rear panel: High-voltage triaxial (3-lug) for Output and Sense |
Interfaces
| Parameter | Value |
|---|---|
| TSP-Link Node Limit | Up to 32 nodes |
| LXI Compliance | LXI Core 2011 (Version 1.4) |
Software & Control
| Parameter | Value |
|---|---|
| SCPI Emulation | Not supported |
Technology
Source Measure Unit (SMU)
Applications
High-voltage power semiconductor testing, material characterization, and high-voltage transient analysis
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