JYE Tech M181 LCR Meter User Manual

: June 1, 2024
: JYE Tech

Table of Contents

Product contents
Get Started
Basic Operations
Zeroing
Serial Data Output
Firmware Upgrade
Specifications
Read User Manual Online (PDF format)
Download This Manual (PDF format)

JYE Tech M181 LCR Meter User Manual

Product contents

M181 LCR Meter
Measurement probes
USB cable

Get Started

Buttons and Connectors

HOLD button Freeze/de-freeze screen
P/S button – Select circuit modes
RCL button Select primary parameters
USB connector Power supply, data transfer, and firmware upgrade
Probe connectors Connecting measurement probes
Serial port J4LVTTL level com port

Screen Displays

Circuit mode (serial or parallel)
Primary parameter
Secondary Q
Secondary ESR –
HOLD indicator
Measurement frequency
Secondary:D

Basic Operations

Power on and off
Power on :Connect the device to a USB power source with the USB cable
Power off: Disconnect the USB cable
Make measureements

Select the primary with the RCL button
Select a circuit mode with the P/S button
Connect the probes with the component to be measured. Read results on the screen.
Press the HOLD button can freeze the readings. Press the button again will de-freeze and measurements will resume.

Change frequency
Holding down the RCL button for 2 seconds will toggle the frequency between 1KHz and 100Hz

Zeroing

Open zeroing

Keep the probes open (do not connect to anything)
Hold down the HOLD button for 2 seconds

Note: Open zeroing improves the accuracy of high impedance measurements by removing the impact of stray parameters.

Short zeroing

Firmly keep the probes be shorted
Hold down the HOLD button for 2 seconds.

Note: Short zeroing improves the accuracy of low impedance measurements by removing the impact of stray parameters

Serial Data Output

The measurement readings are output serially from the port J4 (LVTTL level) and the USB virtual comport.
Note: A driver for the CH340 USB-Uart converter is required to received the data through the virtual comport.
Serial transmission format:
The serial data are transmitted in 8N1 format at a baudrate of 115200bps.

Serial Data Format

For each measurement one data line is output. Each data line consists of multiple fields.
All the data fields are ASCII strings separated by commas.
All the numbers are in decimal base.
All impedances are in the unit of ohm (0) with 3-digit fractions
Capacitance is in the unit of micro-farad (F) with 7-digit fractions.
Inductance is in the unit of micro-henry (H) with 1-digit fraction.
Impedance angle is in the unit of degree (“) with 3-digit fractions.
Qand Dare with 4-digit fractions.
A data line is terminated with one CR character (0x0D) and one LF character (0x0A).

The table below shows the format of a data line.

Field #	Definitions	Remarks
1	“Rs”, “Rp”, “Cs”, “Cp” “Ls”, or “Lp”	Primary and circuit mode
2	Primary reading
3	Q	Secondary Readings
4	D
5	ESR
6	1z1	Primitive measurements
7	e (impedance angle)
8	Rs
9	Xs
10	CR(OxOD) and LF (OxOA)	Line end marks

Firmware Upgrade

Tools required

Flash Loader Demonstrator from ST This application can be downloaded at https://[www.st.com](http://www.st.com)/en/development tools flasher stm32. html
USB cable with micro-USB plug

Steps:

Download and install Flash Loader Demonstrator to a PC.
Download and install a driver for CH340 USB-Uart converter.
Download the firmware to be upgraded from www.jvetech.com.
Short the jumpers Jp1 and Jp2 with solder.
Connect the M181 meter to the PC with a USB cable.
Start Flash Loader Demonstrator. For the details of how to use this tool please refer to “WAVE2: How to upgrade firmware”wp-content/uploads/dim_uploads/ WAVE2_HowTo Upgrade Firmware.pdf).
Note:
- Select “STM32_Med-density_128K” at the pull down list for Target.
- Do not do global erase to the chip. Otherwise critical data will be lost.
After the firmware has been written, disconnect the USB cable and remove the shorts on JP1 and JP2.
Power up the meter again, Check if the firmware has been correctly upgraded.