Yokogawa 720254 4-Channel 1MS/s 16-Bit Isolated Input Module

Description

Product Introduction

The Yokogawa 720254 is a 4-channel, 16-bit high-resolution isolated analog input module designed for the ScopeCorder family, including the DL850, DL850E, DL950, and SL1000 mainframes. Engineered for precision test bench measurements, it provides simultaneous multi-channel sampling for dynamic voltage signals, inverter outputs, and electro-mechanical transducer feedback.

Unlike standard 2-channel cards that force channel-count compromise, the 720254 doubles input density per slot without sacrificing isolation or vertical accuracy. Its 1 MS/s sampling speed combined with a 16-bit A/D converter delivers exceptional signal fidelity, allowing engineers to capture tiny ripple voltages riding on top of high-voltage DC buses.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

Picture this: You are on-site running endurance validation on an electric vehicle inverter drive at 11 PM. Suddenly, a transient voltage spike triggers a nuisance shutdown on the test stand. Your standard 8-bit scope doesn’t have the dynamic range to measure low-level sensor noise and high-voltage switching transients at the same time, and you’ve run out of open module slots on your mainframe.

In our field experience, dropping a Yokogawa 720254 card into your ScopeCorder gives you 4 fully isolated 16-bit channels in a single slot. You get the channel density to monitor all three inverter phases plus a DC bus line simultaneously, pinpointing the noise coupling source in minutes.

• EV & Hybrid Powertrain Testing – Inverter phase current and voltage logging – Isolates ground potential differences across high-voltage batteries and motor controllers.
• Renewable Energy Grid Interconnection – Solar inverter and wind turbine power quality analysis – Captures harmonics up to 300 kHz with 16-bit dynamic accuracy.
• Industrial Robot Validation – Multi-axis servo motor drive profiling – Tracks simultaneous voltage and current feedback curves across multi-joint movements.
• Rail Transportation Systems – Traction motor breaker transient monitoring – Withstands common-mode voltage offsets while capturing fast switching events.

720254

720254

Transparency SOP: Quality Assurance & Testing

We don’t just ship boxes; we test them on actual Yokogawa mainframes. Here is how we verify every 720254 module before it leaves our facility:

1. Inbound Physical Inspection: Check BNC connector gold pins, verify side-rail latching mechanisms, inspect housing plastics for cracks, and check genuine OEM serial tags.
2. Mainframe Slot Recognition Test: Slide the module into a live DL850 chassis slot to confirm automatic ID recognition, bus handshake, and self-calibration routines.
3. Multi-Point Signal Generator Calibration: Inject precision DC voltages and sine waves (1 kHz to 200 kHz) across all 4 channels using a calibrated Fluke signal source to confirm gain accuracy and 16-bit linearity.
4. Channel-to-Channel Isolation Check: Apply differential common-mode voltage offsets across channel grounds to verify optical/galvanic isolation integrity.
5. Final Clean & Anti-Static Packaging: Clean connector contacts with precision solvent and vacuum-seal the card inside an ESD shielding bag with fresh desiccant.

The Veteran’s Tech Trap Guide (Crucial Value-Add)

• ⚠️ Respect the 42V Direct Limit! The BNC inputs on the 720254 are rated for a maximum direct input of 42 V (DC + AC peak). If you connect 100V+ directly without a properly rated 10:1 or 100:1 isolated passive probe, you will destroy the front-end attenuator hybrid.
• ❗ Check Mainframe Firmware Version: If your ScopeCorder running older firmware fails to recognize the 720254 card, update the mainframe OS. The 4-channel module driver requires specific system software revisions to map all 4 channels correctly in the GUI.
• ⚠️ Mind the Total Sample Rate Memory Limits: Running multiple 720254 modules at the maximum 1 MS/s rate across all 16 or 32 channels will fill internal acquisition RAM very quickly. Set your record length and trigger conditions carefully to avoid missing critical event windows.
• ❗ Use Insulated BNC Cables: Because the BNC outer shells are elevated to the signal ground potential of each isolated channel, use insulated BNC cables. Unshielded standard metallic BNC leads pose a shock hazard if connected to high common-mode voltages. Trust me.

Frequently Asked Questions (FAQ for Conversion)

Q: Is the Yokogawa 720254 module hot-swappable in a ScopeCorder?

A: No. Always turn off the ScopeCorder mainframe power switch before inserting or removing input modules to prevent bus driver damage or system lockups.

Q: Can I use standard oscilloscope 10:1 probes with the 720254?

A: Yes, provided the probes match the module’s 1 MΩ input impedance and are rated for the voltage levels in your setup. For safety on elevated channels, always use fully insulated, safety-rated probes.

Q: What is the main difference between the 720254 and the older 701251 modules?

A: The 720254 provides 4 channels per slot with 16-bit resolution at 1 MS/s. Older modules like the 701251 typically offered only 2 channels per slot, making the 720254 superior for high-density testing.

Q: What warranty comes with this module?

A: We back all New Surplus and Refurbished Yokogawa ScopeCorder modules with a complete 12-month replacement warranty from the date of invoice.

Q: Why buy surplus modules instead of ordering factory-new from Yokogawa?

A: Yokogawa test modules often have multi-week factory lead times. Sourcing bench-tested surplus modules gets your test cell back up and running immediately at a fraction of the list price.