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XJW01 Auto LCR meter review ($120 bench top LCR meter)
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Wh1sper:
I purchased this LCR Meter lateley.
https://www.banggood.com/DIY-Auto-LCR-Digital-Electric-Bridge-Resistance-Capacitance-Inductance-ESR-Meter-Kit-p-1113600.html
I'm very pleased with it, the price is awesome!

I found a bit more of information about the usage, I think I'll try to brush up it a bit and put it on my Homepage in English and German.
Specmaster:

--- Quote from: Wh1sper on April 30, 2017, 09:51:09 am ---I purchased this LCR Meter lateley.
https://www.banggood.com/DIY-Auto-LCR-Digital-Electric-Bridge-Resistance-Capacitance-Inductance-ESR-Meter-Kit-p-1113600.html
I'm very pleased with it, the price is awesome!

I found a bit more of information about the usage, I think I'll try to brush up it a bit and put it on my Homepage in English and German.

--- End quote ---

I brought mine a few months ago, already assembled from here http://www.ebay.co.uk/itm/Auto-LCR-Digital-Electric-Bridge-Resistance-Capacitance-Inductance-ESR-Meter-New-/181367473225?hash=item2a3a580449:g:UogAAMXQeKNTOh0c and I must say that I'm very impressed with its accuracy but not so its manual, or should I say lack of a manual, so any extra information on this would be most welcomed by many of us on this forum.
Wh1sper:
My German Article is in a first shot state, who can read German is welcome to comment for suggestions.
http://zockertown.de/s9y/index.php?/archives/1672-LCR-Auto-Meter-Digital-Bridge-XJW01.html

Here comes the automatic Google Trans of the chinese Description, which was my input for the German Article.

--- Quote ---LCR-3 digital bridge
Stalls:
Inductance 200mH - 2000H minimum resolution 0.1uH
Capacitance 200pF - 200mF Minimum resolution 0.01pF
Resistance 2000m?- 20M? Minimum resolution 0.1m?
 
Secondary display range:
Q: 0.000- 999.0
D: 0.000-9.999
?: -179.0- +179.0
 
 
Features:
? main display 1999.9 count, vice display 999.9 count ? measurement frequency: 100HZ / 1KHZ / 7.8KHZ
? measurement voltage: 0.2Vrms
? output impedance: 40?
? basic accuracy: 0.3%
?LCR automatic identification / manual measurement
? open / short circuit calibration compensation
 
Cs :
Capacitance parallel mode
Cs: Capacitance series mode
Lp: Inductance parallel mode
Ls: Inductance series mode
Rp: Resistance parallel mode
Rs: Resistance series mode

Secondary display:
Q: Quality factor
D: Loss factor
?: Phase angle
Rp: Equivalent Shunt
Resistance ESR: Equivalent Series Resistance
Xp: Equivalent shunt reactance
Xs: Equivalent series reactance
 
 
Operation Guide:
Press " menu ( MENU ) to enter the main menu
and press the " range ( the RNG ) " key to enter the calibration mode  ,  then pressing the  C key, the current key : ( Z0 of items) the calibration data will be cleared !!!
To restore the default accuracy of 0.5%
Can be calibrated to 0.3%
 
1, automatic measurement
When the instrument is turned on, the default state is auto recognition mode (AUTO), the default measurement frequency is 1KHz.
In automatic mode, the instrument automatically recognizes the impedance characteristics of the measured object, and automatically selects the series-parallel mode of the main parameters of L, C or R.
In the automatic measurement mode, the series-parallel mode depends on the impedance of the measured object. When the impedance is high (> 10K?), the parallel mode is selected and the impedance is low (<10K?).
 
2, L / C / R mode measurement parameters
1) Main parameter selection, in the power state default AUTO, press the "mode (X)" key parameters are selected as "AUTO ? AUTO-C ? AUTO-L ? AUTO-R ? AUTO"
Note 1: The series mode is "ESR", the parallel mode is "RP", Xs / Xp is activated only when the main parameter R (resistance) is active.
 
3, series and parallel measurement mode selection , in the corresponding main mode press the "value (R)" key, the parameters are selected as "AUTO- <C \ L \ R> ? P ? S ? AUTO- <C \ L \ R> ".
 
4, the measurement frequency, the bridge provides three frequency test points: 100HZ / 1KHZ / 7.8KHZ boot the default frequency of 1KHz, press the "frequency (F)" key can choose a different frequency point measurement "1KHZ ? 7.8KHZ ? 100HZ ? 1KHZ ".
 
5, open / short-circuit calibration compensation , measurement clip open or short-circuit state under the "zero (C)" key can be swept open / short circuit calibration compensation. (Measurement clamp open press the "zero (C)" key to scan the open circuit clear test clip short circuit by C key to do short-circuit clear)
 
6, advanced mode ?2004 screen? , press the "Save (L)" key in any measurement mode to enter this mode (manual mode), exit manual mode Press "Save (L)" key.
In the advanced mode mode, the "Range (RNG)" key is available and the range "40R ? 1K ? 10K ? 100K ? 40R" is switched.
The first line shows the following:
Manual mode identification, and serial identification, impedance - reactance
The second line shows the following:
Measurement frequency, main range, capacitance (inductance) measured value, Q value
 
7, calibration mode , press the "menu (menu)" key to enter the main menu. And then press the "rng" key to enter the calibration mode
To exit the calibration mode: Press the "menu" key to enter the main menu, and then press the "Mode (X)" key to return to the measurement mode.
In calibration mode, the parameter (Q), frequency (F), these two keys are selected for calibration items.
Mode (X), value (R), which is the + - calibration parameter value.
"Save (L)" key: save the calibration results, after calibration must press the "save (L)" button, otherwise the calibration results will not be stored.
"Zero" (C) key: Used to clear the value of the current calibration item.
Pressing 5 times in succession will load the default calibration value.
8. Relative measurement
In the measurement mode, pressing the"Parameter(Q)"key will record the current measurement and enter the relative measurement mode, press the"parameter(Q)"key again, or the mode switch, etc. Relative measurement. In the relative measurement mode, the sub-participant shows the relative error of the measured object at the recorded value, and the representation is the percentage.
The range is:-99.9%to+ 99.9%
 
 Note: In calibration mode, mode (X), value (R) long press can quickly increase or decrease the calibration value.
 
 
?

Features
measurement method
frequency
Stalls
Minimum resolution
Capacitor Block C
Cs / Cp
100Hz
2000.0pF ~ 200.00mF
0.1pF
1KHz
2000.0pF ~ 20.000mF
0.1pF
7.8KHz
200.00pF ~ 2.0000mF
0.01pF
Inductance block
Ls / Lp
100Hz
2000.0mH ~ 2000.0H
0.1?H
1KHz
2000.0mH ~ 200.00H
0.1?H
7.8KHz
200.00mH ~ 20.000H
0.01?H
Resistance file R
Rs / Rp
100Hz
2000.0m? ~ 20.000M?
0.1m?
1KHz
2000.0m? ~ 20.000M?
0.1m?
7.8KHz
2000.0m? ~ 2.0000M?
0.1m?
 
 
LCD 2004 screen can display 20x04 or 80 characters at the same time.
 
Turn on the power supply first screen display LCR digital bridge Author information:
 
?
XJW, PUTIAN, 2012
 
And then into the working state:
 
2004 screen
?
 
?
LCD2004 screen physical map
?
 
 
 
Finished plate has been calibrated to 0.3% , if necessary , can be self-calibration:
setting menu:
Press the "menu" button to display the following:
?
?
Under this screen: Return to the measurement mode Press the "Mode (X) " key. To enter the calibration settings Press the " Rng " key.
Calibration default: press 5 times C key (just 5 times) to restore to the default value, then press the L key to save. The first calibration must be restored to the default value.
(Note: Press " menu ( MENU ) key to enter the main menu and press. " Range ( the RNG ) " key to enter the calibration mode  ,  then pressing the  C key, the current calibration data items will be cleared !!!)
The following items are displayed in the calibration settings:
 
"Z0: 000"?100Hz zero calibration? is calibrated to 0
"Z1: 000" [1kHz zero calibration] is calibrated to zero
"Z2: 000" [7.8 kHz zero calibration] is calibrated to zero
"R1: 40" [ V / I converter lower arm  resistance 40R calibration ] access 40R resistor, calibration to resistance nominal value 40 ohms
"R1X: 40" [40R phase] is calibrated to phase 0
"ak: 25" linear calibration [AD]                 12 years . 1 January STC film AK values . 5 to 30 between. Access 25 ohm resistance calibration (normally set to zero)
"R2: 1k" [ V / I converter lower arm   resistance 1K calibration ] access 1K resistance, calibration to resistance nominal value 1K
"R2X: 1k" [1k phase] is calibrated to phase 0
"R3: 10k"?V / I converter lower arm  resistance 10K calibration? access 10K resistance, calibration to resistance nominal value 10K
"R3X: 10k" [10k phase] access 10K resistor, transferred to the capacitor as the value of open-circuit residual capacitance. (0.1p-3.5p if the unit is H please hold down the X key, one will become a 0.1P-3.5p
"R4: .1M" [ V / I converter lower arm resistance 100K calibration ] access 100K resistance, calibration to resistance nominal value 100K
"R4b: .1M " [7.8kHz frequency 100k file amplitude calibration] access 100K resistance, calibration to the nominal value of resistance 100K
 "R4X: .1M"?100k phase? access 100K resistor, transferred to the capacitor as the value of open-circuit residual capacitance. (0.1p-3.5p)
"G1: 3k" [op amp 3 times gain calibration] access 3K resistance, calibration to resistance nominal value 3K
"G1X: 3k" [3 times the file phase] access 3K resistance, transferred to the capacitor as the value of open-circuit residual capacitance. (0.1p-3.5p)
"G2: 9k" [op amp 9 times gain calibration] access 9K resistance, calibration to resistance nominal 9K
"G2b: 9k" [7.8kHz frequency 9 times the file amplitude calibration] access 9K resistance, calibration to the nominal value of resistance 9K
 "G2X: 9k" [9 times the file phase] access 9K resistor, transferred to the capacitor as the value of open-circuit residual capacitance. (0.1p-3.5p)
"PhX: 1k" [1kHz below phase calibration] is recommended to zero           
 
After entering the calibration menu, use the Q (left) or F (right) keys to toggle the parameters. The X and R keys are plus, minus the number.
PhX , R4b , G2b is a special calibration item, it is recommended to zero.
Calibration Order: Black Item Red Item Blue item .
 
After calibration is complete, be sure to save the L key. And then press the "menu" button, return to the main menu, press the "mode (X)" key, exit.
Note: In calibration mode, mode (X), value (R) long press can quickly increase or decrease the calibration value.
?

Tel: 18954185369

QQ: 469968260

E-Mail: freefm@126.com

--- End quote ---
Radiohead:
I found the translated schematic by BlueSkull in this thread https://www.eevblog.com/forum/projects/chinese-lcr-meter-schematic-with-stm32-questions-can-someone-translate-please/msg832297/#msg832297 and the ebay hardware kit almost 1:1 copied into an Indian paper, published on 3 October 2016: http://ijiet.com/wp-content/uploads/2017/01/18.pdf while search for RLC meter designs. Of course no references to either of them.
WhichEnt2:
Can anyone tell me about the 2.7MOhm parameter (attachment)? Avaliable docs are not clearly describe this.
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