Description
Keysight 34902A – 16 Channel Multiplexer (2/4 Wire) Module for 34970A/34972A
The Keysight 34902A employs reed relays to achieve scan rates up to 250 channels per second. Use this module for high-throughput automated test applications as well as high-speed data logging and monitoring tasks.
Sixteen two-wire inputs switch up to 300 V. Two- and four-wire channels may be mixed on the same module. User provided shunt resistors are required for current measurements.
Note: Not recommended for connection to ac line without external transient suppression.
Multiplexer selection guide
Choose between the broad functionality of the 34901A, the high speed scanning of the 34902A, or the single-ended density of the 34908A. These three modules are the only way to connect to the 34970A/34972A internal DMM. They can be used to scan with external instruments as well.
All multiplexer modules employ break-before-make scanning, ensuring only one closed channel (or channel pair) at a time. Multiple channel closures are allowed on the 34901A and 34902A modules when not configured for scanning.
The 34908A does not allow multiple channel closures at any time.
Mainframe sold separately.
| 34901A | 34902A | 34908A | |
| Number of channels | 20 + 2 | 16 | 40 |
| Max scan speed | 60 ch/s | 250 ch/s | 60 ch/s |
| Number of contacts | 2 or 4 | 2 or 4 | 1 |
| Thermocouple | ✔ | ✔ | ✔ |
| 2-wire RTD | ✔ | ✔ | ✔ |
| 4-wire RTD | ✔ | ✔ | |
| Thermistor | ✔ | ✔ | ✔ |
| DC volts | ✔ | ✔ | ✔ |
| AC volts | ✔ | ✔ | ✔ |
| 2-wire ohms | ✔ | ✔ | ✔ |
| 4-wire ohms | ✔ | ✔ | |
| Frequency | ✔ | ✔ | ✔ |
| Period | ✔ | ✔ | ✔ |
| DC current | ✔ | ||
| AC current | ✔ |


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