The MTT MS3766H Slim Plug-In Analog Memory captures and holds a DC current or voltage output signal when triggered by an external hold command, giving control systems a way to freeze a reading during calibration, maintenance, or a brief signal interruption without letting a bad value propagate downstream. Like the standard MS3766, it releases the hold and resumes tracking the live input as soon as the hold command is cleared.
What sets the MS3766H apart is its front-panel UP and DOWN switches, which let a technician manually nudge the held output value up or down once it is frozen — useful for manual-station style operation where an operator needs to bias or override a held signal on site rather than simply freezing it as-is. An adjustable output delay lets the transition into hold mode be timed to the process, and clear LED status indicators show whether the unit is tracking live, holding, or reporting a fault. As with the standard model, isolation between input, hold control, output, and power keeps the signal protected from noise and ground loops.
| Input Ranges | Current -100 to 100mA (100µA-200mA span); voltage -300 to 300V (200mV-600V span) |
| Input Resistance | 1MΩ min. (voltage); 10Ω-250Ω (current, varies by range) |
| Max Allowable Input | 40mA DC (current model); 30V DC (voltage model) |
| Input Bias | -100 to 100% |
| Output Ranges | 0-20mA (4-20mA span) or -10 to 10V (10mV-20V span); single isolated output |
| Output Load | 750Ω max (current); 2mA max (1V+ voltage spans) |
| Adjustment | ±5% of span, zero and span, via front trimmers |
| Held Value Adjustment | Front-panel UP/DOWN switches, 0.5% increments or continuous 0-100% sweep in approx. 20 seconds |
| Output Delay | Adjustable 0-30s in 1s increments |
| Accuracy | Better than ±0.2% of span (at 25°C±5°C); ±0.2% of span per 10°C temperature effect |
| Response Time | 400ms max (0-90%, step input at 100%) |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Isolation | 5-way isolation between input, HOLD/UP/DOWN control terminals, output, power, and ground; 100MΩ min. insulation resistance @500V DC; 2000V AC dielectric strength (1 minute), 500V AC (output to control terminals) |
| Power Supply | 100-240V AC (85-264V, 47-63Hz), 24V DC ±10%, or 100-240V DC (85-264V); 6.5VA max (AC) / 1.8W max (24V DC) / 7.2W max (DC) |
| Dimensions | W29 x H86 x D125mm (including mounting screw and socket) |
| Weight | 130g (main unit) / 80g (socket) max |
| Terminals | M3.5 screw terminal, 0.8-1.0 Nm torque |
| Mounting | Wall or DIN rail mount |
| Operating Conditions | -5 to 55°C, 5-90% RH non-condensing |
| Storage Temperature | -10 to 60°C |
| Additional Features | LED status indicators (green normal, blinking green hold, red error); hold status can be configured without power |
Frequently Asked Questions
What is the MTT MS3766H used for?
It’s a slim plug-in analog memory that captures and holds a DC current or voltage output signal when triggered by an external hold command, giving control systems a way to freeze a reading during calibration, maintenance, or a brief signal interruption without letting a bad value propagate downstream. Like the standard MS3766, it releases the hold and resumes tracking the live input once the hold command is cleared.
How is the MS3766H different from the standard MS3766?
Front-panel UP and DOWN switches. Once the output is frozen, a technician can manually nudge the held value up or down in 0.5% increments, or sweep continuously through the full 0-100% range in about 20 seconds. The standard MS3766 has no manual adjustment while held. Choose the H model when you need to manually set a test or simulation value while the output is on hold.
How is the hold triggered?
A dry contact or TTL signal on the hold input tells the MS3766H when to capture and freeze its output, the same triggering method as the standard model.
What input and output signal types does it accept?
Input accepts current (-100 to 100mA) or voltage (-300 to 300V), and output is a standard 0-20mA current or -10 to 10V voltage span, single output only. Tell us your input and output combination and we can confirm the setup.
How do I know if I need the MS3766H instead of the standard MS3766?
If you need to manually fine-tune or set the held output value, for example to simulate a specific test signal while calibrating downstream equipment, the MS3766H’s UP/DOWN adjustment gives you that control. If you just need to freeze the last live reading with no manual adjustment, the standard MS3766 is sufficient. Send us your requirement and we can confirm which model fits.
Download MTT MS3766H Slim Plug-In Analog Memory information here
Spec Sheet: MTT_SpecSheet1_MS3766H_Rev190_E
Manual: MTT_Manual1_MS3766H_Rev150_E
