The Keysight 34903A (formerly Agilent 34903A) is a 20-channel actuator and general-purpose switch module designed for the 34970A and 34972A Data Acquisition/Switch Units. Featuring independent single-pole, double-throw (SPDT / Form C) latching relays, this module is engineered for cycling power to devices under test, controlling indicator lights, and actuating external solenoids or power relays. It supports high-voltage, high-current switching up to 300 V and 1 A with low thermal offset, delivering reliable performance in complex automated test systems.
Specifications
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 °C to 55 °C |
Channel & Contact Configurations
| Parameter | Value |
|---|---|
| Number of Channels | 20 |
| Switch Configuration Type | Actuator / General Purpose Switch |
| Contact Form | SPDT (Form C) |
| Relay Type | Latching |
| Maximum Switching Voltage (DC) | 300 V |
| Maximum Switching Voltage (AC RMS) | 300 V |
| Maximum Switching Current (DC) | 1 A |
| Maximum Switching Current (AC RMS) | 1 A |
| Maximum Switching Power (W) | 50 W |
| Thermal Offset | < 3 µV (typical) |
AC & RF Transmission Performance
| Parameter | Value |
|---|---|
| Bandwidth (-3 dB) | 10 MHz (typical into 50 Ω) |
Relay Switching Characteristics
| Parameter | Value |
|---|---|
| Maximum Switching Rate | 120 channels/sec |
| Electrical Relay Lifetime (At Rated Load) | 100,000 cycles |
Physical Connectivity & Wiring
| Parameter | Value |
|---|---|
| Terminal Block Type | Built-in screw terminals |
Mainframe Integration
| Parameter | Value |
|---|---|
| Compatible Mainframes | Keysight 34970A, Keysight 34972A |
| Number of Slots Required | 1 |
Environmental & Safety
| Parameter | Value |
|---|---|
| Storage Temperature Range | -40 °C to 70 °C |
| Operating Humidity Range | Up to 80% R.H. at 40 °C (non-condensing) |
| Maximum Operating Altitude | 2000 m |
| Recommended Calibration Interval | 1 year |
Voltage Ratings
| Parameter | Value |
|---|---|
| Maximum Voltage (Channel-to-Chassis) | 300 V AC/DC |
Technology
Electromechanical Relay
Applications
Power switching, automated testing, control of external relays and actuators