The Keithley 194A is a programmable high-resolution digitizer engineered for precision waveform acquisition and multi-function signal analysis. It acquires waveforms with frequency components below 500 kHz using external triggering at sampling rates up to 1 MS/s, with selectable 16-bit resolution at rates to 100 kHz or 8-bit resolution from 100 kHz to 1 MHz. The instrument digitizes signal levels from 10 µV to 200 V across an isolated input, making it suitable for floating or ground-referenced measurements. Its 64 KB memory capacity stores either 32k samples at 16-bit resolution or 64k samples at 8-bit resolution, enabling comprehensive waveform capture for post-acquisition analysis.
## Technical Specifications
**Sampling and Resolution**
• Externally triggered sampling: up to 1 MS/s
• 16-bit (4½-digit) resolution at sampling rates to 100 kHz
• 8-bit resolution at 100 kHz to 1 MHz
• Programmable sampling interval: 1.0 µs to 1.0 s with 0.1 µs resolution
• Minimum detectable change: 1 part in 32,000 at 100 kHz
**Input Specifications**
• Input range: 10 µV to 200 V
• Maximum input: 250 V peak, 2×10⁷ V·Hz
• Input impedance: 1 MΩ shunted by 60 dB (DC to 1 kHz, 1 kΩ unbalance)
• Isolated input—floating signal measurements permitted
**Memory and Storage**
• Total capacity: 64 KB
• 32k samples at 16-bit resolution
• 64k samples at 8-bit resolution
**Display and Control**
• 14-digit alphanumeric LED display with function and bus status indicators
• Manual or autoranging operation
**Waveform Analysis Functions**
• Average, Peak to Peak, Plus Peak, Minus Peak, Standard Deviation, True RMS, Integral
## Key Features
• IEEE-488 programmability with 90 KB/s binary transfer rate
• Analog outputs: 0–10 V full scale (X and Y), 2.44 mV resolution
• Z output: 0 V, 5 V, or 15 V selectable
• Clock input/output connectors for external synchronization
• One-hour warmup to rated accuracy
## Typical Applications
Transient waveform capture, signal integrity analysis, frequency-domain measurements below 500 kHz, automated test environments requiring programmatic control.
## Compatibility & Integration
Fully compliant IEEE-488 interface supporting SH1, AH1, T6, TEO, LA, LEO, SR1, RL1, PP0, DC1, DT1, C0, E1 functions. Operates on 105–125 V or 210–250 V selectable, 50/60 Hz.
