The MTT MS3743 is a slim plug-in millivolt isolator built for low-level DC voltage signals in the ±200mV range, the kind of small signal that easily picks up noise or ground-loop interference if it is not isolated close to the source. The MS3743 buffers and isolates that fragile input and converts it into a standard, robust current or voltage output that can travel further and feed downstream equipment reliably.
Zero and span are independently adjustable from the front panel, and a second isolated output is available for feeding an independent monitoring or control system at the same time. Like the rest of the plug-in transmitter series, the MS3743 clips into its own socket base for fast swap-out during calibration or maintenance without disturbing the field wiring, and flexible AC or DC power plus wall or DIN rail mounting make it easy to fit into an existing panel.
| Input Range | -200mV to 200mV DC |
| Input Span | 20mV to 400mV (40mV min. for ranges with negative signals) |
| Input Resistance | 1MΩ min., with or without power |
| Max Continuous Input | 30V DC |
| Output | 0-20mA DC current or -10 to 10V DC voltage; single or dual output |
| Output Load | 750Ω max. (4-20mA single); 550Ω/350Ω max. (dual); 2mA max. (1V+ voltage spans); 10kΩ/100kΩ min. (10mV/100mV) |
| Adjustments | ±5% zero and span, front-panel trimmers |
| Accuracy | Better than ±0.1% of span (at 25°C±5°C) |
| Temperature Effect | Better than ±0.2% of span per 10°C change |
| Response Time | 80µs max. (0-90%, voltage output); 150µs max. (0-90%, current output) |
| Isolation | 4-way isolation between input, output 1, output 2, and power |
| Insulation Resistance | 100MΩ min. at 500V DC |
| Dielectric Strength | 2000V AC for 1 minute |
| Power Supply | 100-240V AC, 24V DC, or 100-240V DC |
| Power Consumption | 4.0VA max. (AC), 1.6W max. (24V DC), 4.8W max. (100-240V DC), single output |
| Dimensions | W29 × H86 × D125mm |
| Weight | 120g max. (main unit), plus 80g max. socket |
| Mounting | Wall or DIN rail mounting |
| Terminals | M3.5 screw terminals |
| Operating Temperature | -5 to 55°C |
| Operating Humidity | 5 to 90% RH, non-condensing |
Frequently Asked Questions
What is the MTT MS3743 used for?
It’s a slim plug-in millivolt isolator built for low-level DC voltage signals in the ±200mV range, the kind of small signal that easily picks up noise or ground-loop interference if it isn’t isolated close to the source. It buffers and isolates that fragile input and converts it into a standard, robust current or voltage output that can travel further and feed downstream equipment reliably.
What input signal range does it accept?
The input range is -200mV to 200mV DC, with an adjustable span from 20mV to 400mV (minimum 40mV for ranges that include negative signals). Input resistance is 1MΩ min. whether the unit is powered or not.
Can I fine-tune the zero and span after installation?
Yes, front-panel trimmers give ±5% zero and span adjustment, so the output can be trimmed to match the receiving instrument exactly on site.
Can the MS3743 feed two circuits at the same setting?
Yes, a dual output option is available, though output load drops from 750Ω max. on a single 4-20mA output to 550Ω/350Ω max. when running dual outputs. Check your receiving instrument’s input impedance against this before specifying dual output.
How do I know if the MS3743 is right for my application?
If you’re working with a low-level millivolt source, such as a strain gauge or resistance-based sensor output, that needs isolating and boosting to a standard 4-20mA or voltage signal before it travels any distance, the MS3743 is built for that. Send us the exact input signal range and we can confirm before you order.
Download MTT MS3743 Slim Plug-In Millivolt Isolator information here
Spec Sheet: MTT_SpecSheet1_MS3743_Rev290_E
Manual: MTT_Manual1_MS3743_Rev160_E
