Name: Varin Automation Pvt. Ltd.
Address: Khasra No. 130 Vill- Bahadurpur Kursi Road, Lucknow 226021, Lucknow, Uttar Pradesh, 226021, IN
Telephone: +91-77530 03697
Price range: $$

Product catalogue

Instruments designed and built by Varin Automation Pvt. Ltd., Lucknow, India.

MVS-100 MVS-100 Precision mV Source±100 mV in 0.01 mV steps, set from the front panel or an HMI over Modbus RTU.

Prices and lead times on request: sales@varinautomation.com · +91-77530 03697. Specifications are subject to change without notice. Latest details at https://varinautomation.com/products. Need something else? Share your requirement at https://varinautomation.com/products/custom-hardware.

Calibration & test

MVS-100 Precision mV Source

±100 mV in 0.01 mV steps, set from the front panel or an HMI over Modbus RTU.

MVS-100

Panel-mount precision millivolt source for thermocouple, strain-gauge and transmitter checks. ±100.00 mV in 0.01 mV steps, sources and sinks 20 mA with remote sense, controlled locally or over isolated RS-485 Modbus RTU.

Fine, stable output. −100.00 to +100.00 mV DC in 0.01 mV steps, from a 3.18 µV hardware resolution.
Sources and sinks 20 mA. 4-wire FORCE / SENSE output corrects cable drop right at the load.
Isolated Modbus RTU. RS-485 at 9600–115200 baud with function codes 03, 04, 06 and 16.
Clear front panel. 1.3" OLED, rotary knob, OUTPUT and MENU keys, and an output-ON lamp.
Remote or local control. One place controls the output at a time; the HMI can lock the front panel.
Guided calibration. 2-point calibration from the panel or over Modbus, stored in EEPROM.
Fails safe. Comm-loss timeout drops the output to 0 mV, and OFF holds a calibrated 0.00 mV.
Quick wiring. Pluggable 5.08 mm terminals on the rear for power, output and RS-485.

Output
Range	−100.00 to +100.00 mV DC
Setting resolution	0.01 mV (3.18 µV hardware resolution)
Load current	±20 mA, sources and sinks (current limit ≈ 28 mA)
Connection	4-wire: FORCE+, SENSE+, SENSE−, FORCE− / GND
Verified accuracy after calibration	±0.01 mV at +100, 0 and −100 mV
Settling	≈ 1.6 ms to 1 µV after a 10 mV step
Output OFF / comm loss	Actively held at 0.00 mV (calibrated)

Communication
Interface	RS-485, 2-wire, galvanically isolated
Protocol	Modbus RTU slave; function codes 03, 04, 06, 16; broadcast writes
Address	1–247 (default 1)
Baud rate	9600, 19200, 38400, 57600, 115200 (default 9600)
Framing	8 data bits, parity None / Even / Odd, 1 stop (default 8N1)
Bus termination	120 Ω, jumper selectable
Comm timeout	Set in seconds (0 = off); output drops to 0 mV on timeout

Front panel
Display	1.3" 128 × 64 OLED, adjustable brightness and auto-dim
Controls	Rotary encoder with push, OUTPUT key, MENU key
Indicator	Output-ON lamp (light pipe)
Modes	REMOTE (Modbus), LOCAL (panel), LCK (panel locked by HMI)
Calibration	Guided 2-point (−30 / +30 mV) with DMM entry

Power & mechanical
Supply	12–24 V DC, 3 W max
Housing	DIN 144 × 72 mm (IEC 61554) panel instrument case
Panel cut-out	138 (+1.0) × 68 (+0.7) mm
Depth behind panel	124 mm
Mounting	Panel clamps from behind
Field terminals	Pluggable 5.08 mm blocks on the rear: power, output, RS-485
Firmware	v3.1, field-updatable over ISP

Terminals

RS-485

Modbus RTU (isolated)

D+RS-485 A
D−RS-485 B
SGIsolated signal ground

OUTPUT

±100 mV output

F+FORCE+
S+SENSE+
S−SENSE−
F−FORCE− / GND

POWER

12–24 V DC

+VSupply +
0 VSupply 0 V

Ordering
MVS-100	Precision mV Source, ±100 mV, front panel + isolated RS-485 Modbus RTU
Option: HMI screens	Ready-made Delta DOPSoft / DIAScreen screens for setpoint, ON/OFF and calibration
Option: calibration report	Multi-point verification against a 6½-digit DMM

Instruments we design and build.

1 product, more modules on the way.

MVS-100 Precision mV Source

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MVS-100 Precision mV Source

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