VARINAUTOMATION

MVS-100 datasheetMVS-100 Precision mV SourceVarin Automation Pvt. Ltd. · Khasra No. 130 Vill- Bahadurpur Kursi Road, Lucknow 226021 · +91-77530 03697 · sales@varinautomation.com · varinautomation.com

3D view of the MVS-100 boards inside the see-through DIN housing

Calibration & test

MVS-100 Precision mV Source

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: $$

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

Made to orderModel MVS-100

Output: −100.00 … +100.00 mV DC
Resolution: 0.01 mV
Load current: ±20 mA, source and sink
Interface: Isolated RS-485 Modbus RTU
Supply: 12–24 V DC, 3 W max
Housing: DIN 144 × 72 mm panel mount

Price on requestBuilt and calibrated to order. Add to your basket for a formal quotation.

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Overview

A dependable millivolt reference for your panel or bench.

The MVS-100 generates a stable DC millivolt signal from −100.00 to +100.00 mV for checking and calibrating thermocouple inputs, load-cell and strain-gauge amplifiers, transmitters and DAQ channels. It fits a standard 144 × 72 mm DIN panel cut-out, so a test bench or panel door gets a permanent, repeatable reference.

Set the output from the front panel with the knob, or hand control to a Delta (or any Modbus RTU master) HMI over isolated RS-485. Only one place controls the output at a time, and the display always shows which: REM, LOC or LCK.

A 4-wire Kelvin output with remote sense corrects cable drop at the load, and the output stage sources and sinks up to 20 mA. If the HMI link is lost, a configurable timeout drops the output to 0 mV.

MVS-100 OLED main screen showing output ON at +45.27 mV in LOCAL mode — Front-panel display: output ON at +45.27 mV, 0.01 mV step

Output range: ±100 mV
Setting steps: 0.01 mV
Source and sink: ±20 mA
RS-485 Modbus RTU: Isolated

Why engineers choose the MVS-100

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 mA4-wire FORCE / SENSE output corrects cable drop right at the load.
Isolated Modbus RTURS-485 at 9600–115200 baud with function codes 03, 04, 06 and 16.
Clear front panel1.3" OLED, rotary knob, OUTPUT and MENU keys, and an output-ON lamp.
Remote or local controlOne place controls the output at a time; the HMI can lock the front panel.
Guided calibration2-point calibration from the panel or over Modbus, stored in EEPROM.
Fails safeComm-loss timeout drops the output to 0 mV, and OFF holds a calibrated 0.00 mV.
Quick wiringPluggable 5.08 mm terminals on the rear for power, output and RS-485.

Used for

Thermocouple input checks
Strain-gauge & load-cell amplifiers
Transmitter calibration
DAQ & PLC analog input testing
Automated test equipment (ATE)
Panel-mounted reference source

Product preview

Front panel, terminals and electronics

MVS-100 Precision mV Source in a 144 × 72 mm DIN panel housing, front view — MVS-100 in its 144 × 72 mm DIN panel housing

MVS-100 rear name plate with ratings and RS-485, output and power terminal markings — Rear name plate and terminal markings

MVS-100 main board, Rev G, with precision analog, digital and isolated RS-485 sections — Main board: precision analog, digital and isolated RS-485 sections

Specifications

Technical data

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

Wiring

Rear terminals

Pluggable 5.08 mm blocks, left to right as seen from the rear. For loads near 20 mA, run the SENSE wires to the load to cancel cable drop. Output 0 V is common with the supply 0 V, so use an isolated supply.

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

Codes and what's included

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

In the box
MVS-100 in DIN 144 × 72 mm housing with panel clamps
Mating pluggable terminal plugs for power, output and RS-485
Factory calibration values, stored in the unit
Wiring, HMI setup and Modbus register guide

Modbus RTU

Register map

Holding registers, 16-bit word, 1-based 4x addressing. Read 40007 = 769 (firmware v3.1) to confirm your HMI's address offset.

Address	Register	Access	Meaning
40001	SETPOINT	R/W	Output in 0.01 mV, signed: −10000 … +10000
40002	OUTPUT_EN	R/W	0 = held at 0 mV, 1 = output on
40004	STATUS	R	Output on, clamped, calibrated, comm timeout, LOCAL mode bits
40005 / 40006	CAL_OFFSET / CAL_GAIN	R/W	Calibration offset (0.1 µV) and gain (ppm)
40007	FW_VERSION	R	769 = v3.1
40008–40010	SLAVE_ID / BAUD / PARITY	R/W	Communication settings (apply after save)
40011–40013	CAL_CMD / CAL_MEAS_LO / HI	R/W	2-point calibration over Modbus
40014	COMM_TIMEOUT	R/W	Seconds, 0 = off
40015	POWERUP_MODE	R/W	0 = start at 0 mV off, 1 = restore setpoint
40016	FP_LOCK	R/W	1 = front panel locked by the HMI
40017	MODE	R/W	0 = LOCAL, 1 = REMOTE

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Front-panel screens

Specifications are subject to change without notice. Printed from https://varinautomation.com/products/mvs-100.