The MTT MS3766 Slim Plug-In Analog Memory captures and holds a DC current or voltage output signal at its last value when triggered by an external hold command, then releases it back to tracking the live input once the hold is removed. This is a useful tool wherever a control system needs to freeze a reading temporarily, such as maintaining the last known process value during a sensor calibration, a maintenance window, or a brief upstream signal interruption, without letting a spurious or missing reading propagate downstream.
A simple dry contact or TTL signal on the hold input tells the MS3766 when to capture and retain its output, and an LED status indicator shows at a glance whether the unit is tracking live or holding a stored value. Five-way isolation between the input, hold input, output, power, and ground keeps the held signal protected from noise and ground loops, and front-accessible trimmers allow zero and span to be fine-tuned on site to match the connected instrumentation.
| Input Ranges | Voltage -300 to 300V (200mV-600V span); current -100 to 100mA (100µA-200mA span) |
| Input Resistance | 1MΩ min. (voltage); 10-250Ω (current, varies by range) |
| Max Continuous Input | 30V DC (voltage); 40mA DC (current) |
| Hold Input | Dry contact or TTL, with configurable pull-up options |
| Output Ranges | 0-20mA (4-20mA span) or -10 to 10V (10mV-20V span) |
| Output Load | 2mA max (1V+ span); 750Ω max (current output) |
| Adjustment | ±5% of span, zero and span, via front trimmers |
| 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 input, output, power, and ground; 100MΩ min. insulation resistance @500V DC; 2000V AC dielectric strength for 1 minute |
| 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); 160mA fuse standard |
| Dimensions | W29 x H86 x D125mm (including mounting hardware) |
| 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 indicator (green/red) showing tracking/hold state; flash memory for holding command values |
Frequently Asked Questions
What is the MTT MS3766 used for?
It’s a slim plug-in analog memory that captures and holds a DC current or voltage output signal at its last value when triggered by an external hold command, then releases it back to tracking the live input once the hold is removed. It’s useful wherever a control system needs to freeze a reading temporarily, such as maintaining the last known process value during sensor calibration, a maintenance window, or a brief upstream signal interruption, without letting a spurious or missing reading propagate downstream.
How is the hold triggered?
A simple dry contact or TTL signal on the hold input tells the MS3766 when to capture and freeze the current output, with configurable pull-up options to match your triggering device.
What input and output signal types does it accept?
Input accepts voltage (-300 to 300V) or current (-100 to 100mA), and output is a standard 0-20mA current or -10 to 10V voltage span. Tell us your input and output combination and we can confirm the setup.
How quickly does it respond once the hold is released?
Response time is 400ms max, so once the hold command clears, the output catches back up to the live input signal within well under half a second.
How do I know if the MS3766 is right for my application?
If you need to freeze a signal at its last value during a calibration, maintenance window, or brief upstream interruption, rather than letting a bad reading pass downstream, the MS3766 handles that with a simple contact trigger. Send us your input and output signal types and how the hold will be triggered, and we can confirm before you order.
Download MTT MS3766 Slim Plug-In Analog Memory information here
Spec Sheet: MTT_SpecSheet1_MS3766_Rev210_E
Manual: MTT_Manual1_MS3766_Rev140_E
