Keithley 428
| Attribute | Value |
|---|---|
| Current Gain Ranges | 10³ to 10¹¹ V/A (8 ranges) |
| Maximum Output Voltage | ±10 V |
| Input Bias Current | Less than 75 fA at room temperature |
| Rise Time | 200 µs to 300 ms (depending on gain range) |
| Voltage Noise | 4 nV/√Hz typical |
| Input Connector | Triax connector (3-lug) |
| Output Connector | BNC connector |
| Power Requirements | 100/120/220/240 VAC, 50/60 Hz, 15 VA |
| Operating Temperature Range | 0°C to 50°C |
| Dimensions (H x W x D) | 89 mm x 213 mm x 369 mm (3.5 in x 8.4 in x 14.5 in) |
| Model | 428 |
|---|
The Keithley 428 Current Amplifier features a fast 2 µs rise time, ultra-low 1.2 fA RMS noise, and adjustable gain up to 10¹¹ V/A. It offers nine gain ranges from 10³ to 10¹¹ V/A with selectable rise times ranging from 2 µs to 300 ms, leveraging a sophisticated feedback current circuit for unmatched speed and low-noise performance. Connectivity is streamlined with BNC input/output and an included IEEE‑488 interface.
It excels at converting small, fast currents into voltage signals suitable for oscilloscopes, data acquisition systems, or waveform analyzers. Features like ZERO CHECK, OFFSET, and current suppression up to 5 mA ensure precision and flexibility in diverse test environments.
Testwall can supply the used Keithley 428 Current Amplifier, fully tested. With expert support and global delivery, Testwall ensures high‑performance instrumentation with unmatched reliability and service quality. Please contact us directly if you need calibration or repair of the Keithley 428 Current Amplifier.
