Multifunction calibrator

[JtroTechAB]

Hello,

Looking for calibrator with following specs:

should have Source feature
1) RTD
2) TC

mV: 0-10V
mA: 0-20/40mA

also suggest If any OEM

& any reliable & economical models.

[threephase]

If I am reading your requirements correctly, it is the one to be able to source up to 40mA that is going to put you into a world of hurt. This is an unusual requirement and only comes with the more serious industrial apparatus.

There is the Time 1090 that can source up to 80mA. Then make good reliable test apparatus in my experience, but they tend to have an old, clunky look and feel to them and are not to everyone's taste.

https://www.timeelectronics.com/portable-process-pressure-instruments/1090-portable-process-calibrator/

The other I am familiar with is from Beamex, now the MC6. They are used on many of our plants and have a good reputation, you will be talking serious money though, as it is a complete calibration solution.

https://www.beamex.com/calibrators/mc6-calibrator/

Those are two I am familiar with, another couple I have found that seem to offer the functionality are;

MC50.2, MC75.2 or EC25, all from Sika. I do not know anything about them. They seem to offer similar functionality to the Time unit, but are slightly higher in price.

https://www.sika.net/en/products/test-and-calibration-instruments/simulators/multifunction-simulators.html

The final one is the PIE850, again I know nothing about them. In my country they seem to be between the Time and Beamex units in terms of price, but similar functionality to Time.

https://piecal.com/product/10-50-ma-multifunction-process-calibrator-pie-850/

If you don't need to source 40mA and only need to measure, then you have a lot more options open to you that can only source up to 20mA/24mA.

Kind regards.

[casinada]

https://www.fluke.com/en-us/products/calibration-tools/multifunction-calibrators

Not the cheapest for sure 

[TurboTom]

Just recently I got myself an "el-cheapo" calibrator but was quite amazed of its accuracy. It's the BrightWin (manufacturer?) LB02.

Build quality is more than acceptable and accuracy-wise it meets and mostly surpasses its specs by quite some margin. It's enclosed in an ultra-strong casing and comes in a nice semi-rigid box with a zipper. The probe wires are nothing to phone home about but for a calibrator, I anyway prefer just a set of banana cables with alligator clips at the other ends...

The compact size and the operation with an integral USB-chargable LiPo battery makes the instrument ideal for field applications... It really makes the life of an EE (or physicist that is...  ) a lot easier. The user interface is something you've got to get used to but once familiar, it's okay-ish. I guess that's the trade-in for the small form factor of the instrument.

Please find attached a photo of the PCB inside the unit.

Cheers,
Thomas


Edit: Typos

[JtroTechAB]

Surely this model BRT LB02 falls in budget. And the reviews are also good.

any source explaining the working of this model in detail would be more helpful.
In order to assess its performance.

and source for buying it for fast delivery and from cheaper shipping point of view.

Thanks for the advice. Also further any other model suggestions are also welcome.

[coromonadalix]

the LB02  seems pretty good for its price range ... bookmarked it.

[splin]

Any suggestions as to what all those optocouplers might be used for?

[EDIT] Just found that they are actually bidirectional photo switches - TLP227A so used as relays for signal switching.

[TurboTom]

FYI, the major components of the LB02 are:

ADC: Titan Micro TM7707 (24 bit)
Reference: TI REF5025
DACs: Linear LTC1658 (14 bit) and LTC8043 (12 bit multiplying)
MCU: Microchip (Atmel) ATMega 329PA

Among the analog jellybean stuff, there are two low offset OPAMPS: TI OPA2277 and AD OP07.

An then of course there's the abundance of Toshiba TLP227A photo relays for range switching.

There has to be some more stuff on the other side of the PCB (at least a step-up converter to generate the 24V from the single LiPo cell) but I didn't bother to remove it from the casing since most of the relevant semiconductors appear to be visible directly (was basically interested to find out what reference and ADC they used).

Altogether, especially considering the price, the LB02 is a decent choice. Here are some measurements of the calibrator functions (measured with Rigol DM3068):

Voltage out:
Set [V]- Measured AVRG [V]- Standard Deviation [µV]
1 - 0.99977 - 90
2 - 2.00208 - 125
3 - 3.00186 - 130
4 - 4.00347 - 106
5 - 5.00245 - 130
6 - 6.00304 - 110
7 - 7.00358 - 125
8 - 8.00302 - 98
9 - 9.00453 - 127
10 - 10.00531 - 130
11 - 11.00459 - 115

1m - 0.984m - 1.4
10m - 9.982m - 0.99
50m - 49.996m
100m - 100.021m - 1.22

Current out:
Open Loop voltage: 22.87V

Set [mA]- Measured AVRG [mA]- Standard Deviation [nA]
4 - 4.00058 - 220
8 - 7.99945 - 220
12 - 11.99721 - 250
16 - 15.99461 - 200
20 - 19.99645 - 270
24 - 23.99458 - 250

Resistance out:
(Connection cables zeroed out)

Set [Ohm] - Measured [Ohm]
20 - 20.066
50 - 49.985
100 - 99.963
200 - 199.922
400 - 399.945

Resistance test open loop voltage: 2.50098V

Edit: somehow pressed a key that caused the post to be published before I finished it... 

[m72]

Hello!

New version is LB02A (LB06A with HART/ModBus communicator).

Reference: Analog Devices ADR03A (2.5V)
ADC: Titan Micro TM7707 (24 bit)
DAC: Texas Instruments DAC88301 (16 bit)
MCU: STM32F103VCT6


11V   
set   34401A
1   0.999705
2   1.99961
3   2.99986
4   4.00002
5   5.00017
6   6.00028
7   7.00026
8   8.00043
9   9.00051
10   10.00070
11   11.00085


110mV   
set   34401A
10   9.9895
20   19.9923
30   29.9949
40   39.9959
50   49.9991
60   60.0007
70   70.0041
80   80.0067
90   90.0087
100   100.0113
110   110.0142


24mA source
set   34401A @100 Ohm shunt
4   4.00105
8   8.00087
12   12.0006
16   16.0003
20   19.9994
24   23.9984


24mA sink @100 Ohm shunt
set   34401A
4   4.00096
8   8.00063
12   12.0002
16   15.9994
20   19.9986
24   23.9973


With best regards, Mikhail.

[jorgemef]

Hello,

I saw in BRIGHTWIN page the LB03. Half price, half digits. Is it worthy for hobbyists? What is the reference chip used inside?
I am in doubt between that one or a cheaper LB01 or a precalibrated LM399 board or even go for the LB02.
For now I just need it for calibrating my multimeters and check some circuit references as for passive I have a DE5000 which I trust.

Cheers,
Jorge

[jorgemef]

I finally opened my LB02A which I purchased in Aliexpress.

Reference: TI REF5025
ADC: Titan Micro TM7707 (24 bit)
DAC: Texas Instruments DAC88301 (16 bit)
MCU: STM32F103VCT6

Set (V)   Read (BM969S)   Keythly 2000   HP 34401
1   0,99888   1,000025   0,998903
2   1,99933   2,00001   1,99945
2,5   2,49968   2,50026   2,49974
3   2,99970   3,00016   2,99980
4   4,00016   4,00076   4,00029
5   5,00057   5,00128   5,00079
6   6,0006   6,00146   6,00097
7   7,0011   7,00155   7,00138
7,5   7,5015   7,50196   7,50140
8   8,0017   8,00197   8,00157
9   9,0024   9,00242   9,00199
10   10,0031   10,00277   10,00228
11   11,0035   11,00291   11,00308
         
Set (mV)   Read (BM969S)   Keythly 2000   HP 34401
1   0,952   0,9780   0,9621
10   9,950   9,9772   9,9586
20   19,952   19,9746   19,9614
30   29,953   29,9766   29,9624
40   39,956   39,9782   39,9646
50   49,958   49,9825   49,9693
60   59,959   59,9841   59,9698
70   69,962   69,9869   69,9714
80   79,966   79,9882   79,9729
90   89,973   89,9935   89,9751
100   99,974   99,9962   99,9766
110   109,976   109,9983   109,9805