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Key Technical Specifications
| Parameter | Value |
|---|---|
| Interface | IEEE-488 (GPIB) |
| Secondary Interface | RS-232 (terminal only) |
| Processor | 16 MHz 68000 |
| Slot 0 / Resource Manager | Yes / Yes |
| MXIbus Resource Manager | Yes |
| Flash Memory | 1.75 MB maximum |
| Volatile RAM | 256 KB |
| Non-Volatile RAM | 512 KB to 2 MB (NiCad battery-backed) |
| Shared Memory | 512 KB maximum |
| VXI Compliance | Revision 1.4 |
| Data Transfer Modes | A16, A24, A32, D08, D16, D32, D64 |
| Size / Slots / Connectors | C-size, 1 slot, P1/P2 |
| Trigger Input Rate | 12.5 MHz (TTL), 40 MHz (ECL) |
| CLK10 Sync | External TTL, initial accuracy 50 ppm |
| Module Current (+5 V typ) | 3.2 A |
| Power Dissipation | 19 W/slot |
Product Introduction
The E1406A is a C-size, 1-slot VXI command module from HP, carried forward under Agilent and now Keysight branding. It functions as a Slot 0 message-based commander, running a 16 MHz 68000 processor to handle GPIB-to-VXIbus translation, VMEbus system control, and Resource Manager duties for both message-based and register-based VXI modules in a mainframe like the E8401A or E8404A.
What sets the E1406A apart from a bare VXI-to-GPIB bridge is the SCPI translation layer for register-based devices — it puts register-based hardware on equal footing with message-based instruments from a programming standpoint. Add in the MXIbus Resource Manager for multi-mainframe throughput and onboard flash for downloadable drivers, and it stays the default Slot 0 choice for legacy VXI racks still running IBasic or SCPI-driven test sequences.
E1406A
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No response over GPIB | GPIB address conflict or cable fault | ❌ Low | Verify address with front-panel/IBasic query, swap GPIB cable | Rule out cabling and controller settings before replacing |
| Mainframe fails to enumerate VXI modules | Resource Manager not initializing | ✅ High | Check for Slot 0 error LED, re-run resource manager boot sequence | If error persists after reseat, module likely needs replacement |
| Backplane power fault / no boot | Mainframe power supply issue | ❌ Low | Measure +5 V and +24 V rails at backplane with a multimeter | Check E8401A/E8403A/E8404A power supply before replacing the E1406A |
| Non-volatile RAM data loss on power cycle | Depleted NiCad backup battery | ✅ High | Note how long the mainframe was unpowered vs. rated battery life (10 months at 512 KB) | Battery is a known wear item — often the actual fault, not the module itself |
| Communication timeout with register-based VXI cards | Firmware/driver mismatch | ✅ Medium | Check flash-loaded driver version against register-based module’s requirements | Reload matching driver before assuming hardware failure |
| Intermittent trigger bus errors | Trigger source outside spec range | ❌ Low | Confirm trigger signal is within 12.5 MHz (TTL) / 40 MHz (ECL) and correct pulse width | Usually a source signal issue, not the command module |
If you’re still stuck after running these checks, send us photos of the front-panel LEDs and any diagnostic buffer output — it speeds up the call significantly.
Frequently Asked Questions (FAQ)
Is the E1406A hot-swappable in a running mainframe?
No. It’s the Slot 0 device — pulling it live takes down GPIB communication and Resource Manager function for the whole mainframe. Power down the E8401A/E8403A/E8404A before removal or installation.
Will this unit retain my old programming or configuration?
No, configuration doesn’t carry over automatically. Back up your driver setup and any register-based module addressing before you swap modules, and reload it on the replacement unit. Document your existing GPIB address and RS-232 settings first — it saves a return trip to the rack.
Why is this cheaper than buying new from Keysight?
Keysight lists the E1406A as discontinued, so “new” isn’t really an option through the OEM channel anymore. What you’re buying is either pulled New Surplus stock (unused, factory-sealed) or a Refurbished unit that’s been function-tested. Neither is a knockoff — it’s genuine OEM hardware, just not manufactured today.
Does this work as a direct replacement for my existing E1406A?
In most cases, yes — the module architecture didn’t change across the HP/Agilent/Keysight branding transitions. That said, verify your VXI compliance revision and driver/firmware version against your current setup before ordering. Mismatched flash driver versions have caused comms timeouts on other VXI swaps.
What’s the deal with the non-volatile RAM battery life?
The onboard NiCad keeps configuration and shared memory alive when the mainframe is powered down, and it depletes on a schedule — roughly 10 months for a 512 KB module, down to 2.5 months on a 2 MB module, after a full 15-hour charge. If you’re seeing config loss on power-up, check the battery before assuming the module failed.
Can I mix this with register-based VXI cards from other manufacturers?
The ‘s SCPI translation was built for Agilent/Keysight register-based devices specifically. Third-party register-based modules may not translate cleanly — verify against the OEM datasheet for your specific card before assuming plug-and-play compatibility.
What condition is this unit in, and is it tested?
State plainly per listing: New Original/New Surplus (factory-sealed, untested since manufacture) or Refurbished (tested). If refurbished, it’s gone through power-on self-test, GPIB handshake verification, and load testing — ask for the test report if you want to see the numbers before you buy.
