Description
Product Introduction
The HP Keysight Agilent E1412A is a C-size, single-slot, message-based VXI digital multimeter engineered for high-throughput, automated test equipment (ATE) environments. Incorporating a multi-slope III A/D converter, it delivers true 6.5-digit resolution across voltage, current, resistance, and frequency measurements directly on the VXI bus.
Designed to eliminate measurement bottlenecks in complex test cells, the E1412A handles up to 1,000 readings per second at 4.5 digits into its internal buffer, with 65 range changes per second. Its ability to perform direct SCPI math calculations onboard—including limit testing with TTL output triggers—reduces host controller polling and accelerates production line test cycles.
Key Technical Specifications
| Parameter | Specification / Value |
| Form Factor | VXIbus C-Size, Single-Slot (Message-Based) |
| Measurement Resolution | 6.5 Digits (2,000,000 counts) |
| DC Voltage Ranges | 100 mV, 1 V, 10 V, 100 V, 300 V (Basic accuracy ±0.0019%) |
| AC Voltage Ranges | 100 mV to 300 V True RMS (3 Hz to 300 kHz) |
| DC / AC Current Ranges | 10 mA to 3 A (AC True RMS) |
| Resistance Ranges | 100 Ω to 100 MΩ (2-wire and 4-wire configuration) |
| Frequency & Period | 3 Hz to 300 kHz (Reciprocal counting) |
| Maximum Reading Rate | 1,000 readings/sec (at 4.5-digit resolution to internal buffer) |
| DC Input Impedance | Selectable 10 MΩ or >10 GΩ (100mV, 1V, 10V ranges) |
| Internal Buffer | Stores 1,000 readings at 4.5 digits |
Application Scenarios & The “Trench” Experience
When an automated functional test rack starts throwing intermittent out-of-tolerance failures or drifting during calibration runs, the DMM card is almost always the prime suspect. In our field experience, precision analog front-ends in 24/7 industrial test cells suffer from thermal stress, relay wear, or accidental overvoltage spikes that compromise internal reference diodes.
- Automotive ECU Quality Assurance – End-of-line verification – Measures low-level sensor responses and power rail current draws across thousands of units per shift.
- Aerospace Avionics Test Racks – Subsystem Acceptance – Executes high-accuracy 4-wire resistance and DC voltage checks on multi-pin wiring harnesses.
- Semiconductor & Hybrid Testing – Device Parametric Screening – Uses high input impedance (>10 GΩ) to evaluate delicate signals without circuit loading.
Field Replacement Case: A tier-one automotive supplier faced a line stoppage when their legacy VXI test bench started reporting noisy current readings on a high-speed ECU production line. The internal 3A current input fuse on the E1412A had blown due to a DUT (device under test) short, and prolonged thermal cycles had caused the DMM’s input relays to stick. Replacing the module with a fully re-calibrated surplus unit restored test throughput from zero back to 120 parts per hour in less than 30 minutes.
E1412A
E1412A
Transparency SOP: Quality Assurance & Testing
We do not just check if a module powers on; we validate analog accuracy on live VXI rigs using calibrated standards:
- Inbound Physical & Fuse Inspection: Inspect front-panel terminals, backplane DIN connectors, and verify the integrity of the rear/front current protection fuses.
- DC & AC Voltage Verification: Inject precise DC and True RMS AC voltage signals across all ranges using a calibrated Fluke standard to verify accuracy within OEM tolerances.
- Current & Resistance Rail Audit: Exercise 2-wire and 4-wire resistance modes alongside DC/AC current measurement paths across the full dynamic range.
- VXI Backplane & Buffer Test: Mount in Slot 1+ of a C-size VXI chassis, execute full SCPI command set, and test 1,000 rdg/s buffered data transfers to memory.
- Final QC & Anti-Static Packaging: Seal in ESD-shielded bags with freshly documented serial and calibration checksum tags.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Blown Current Fuses: If your E1412A reads zero amps or yields erratic open-circuit values during current measurements, check the current input fuse on the board. Engineers constantly blow this fuse by applying voltage sources directly across the current terminals during automated switching matrix setups.
- ❗ High Impedance Traps (>10 GΩ): By default, the card may switch to 10 MΩ input impedance on higher voltage ranges. If you are measuring high-resistance circuits on the 100mV–10V ranges, explicitly program the card to 10 GΩ mode (
INP:IMP:AUTO ON). Otherwise, loading errors will skew your readings. - ⚠️ 4-Wire Lead Resistance Errors: Do not rely on 2-wire resistance for values below 1 kΩ if test lead lengths exceed a few feet. Always configure 4-wire ohms (
FRES) or use the onboard Math NULL function to zero out harness resistance. - ❗ Thermal Warm-Up Drift: Don’t run precision 6.5-digit calibration checks immediately upon power-up. Trust me, the analog A/D converter needs at least 60 minutes of stable chassis airflow to reach its rated 24-hour specification.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the E1412A hot-swappable in a live VXI chassis?
A: No. Pulling this card while the VXI backplane is energized can cause electrical arcs across the backplane power pins and permanently damage the A/D converter board.
Q: What is the main difference between the E1412A and the E1312A?
A: The E1412A is a C-size VXI module designed for larger mainframes, whereas the E1312A is B-size. Electrically and programmatically, they use the same core SCPI measurement engine.
Q: Does the E1412A support 4-wire resistance measurements?
A: Yes. It fully supports both 2-wire (MEAS:RES?) and 4-wire (MEAS:FRES?) resistance measurements up to 100 MΩ.
Q: Can I use this card with modern Keysight VISA and I/O Libraries?
A: Yes. As long as your VXI Slot 0 controller (like an E1406A or MXI interface) is recognized by Keysight VISA, the E1412A accepts standard SCPI command strings over the bus.
Q: How do you handle calibration on these discontinued DMM modules?
A: All surplus units undergo full functional baseline testing against precision sources before shipment. NIST-traceable calibration certificates are available upon request prior to dispatch.
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