AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter

[floobydust]

ANENG upped the price to USD $32, what is this capitalism lol

[bitseeker]

They learn everything quickly.

[ebastler]

ANENG upped the price to USD $32, what is this capitalism lol

Where did you see that price? Just spot-checked the link in this thread's OP, and the AN8008 is still available for $18.90 there.

[Gandalf_Sr]

ANENG upped the price to USD $32, what is this capitalism lol

Which model did they increase the price on? I still see the AN8008 on eBay for $13 $23 from China.

My AN8008 just arrived in the mail, so far I've put batteries in it and checked that it seems to operate as expected.

[mauroh]

I just bought it for US $16.99 from Banggood.
Mauro

[texaspyro]

Instead I  added it to the mV function:
* EEPROM address 0xAC changed from 0x00 to 0x13 adds °C to mV function
* EEPROM address 0xBC changed from 0x00 to 0x15 adds °F to mV function

Can you read/write the EEPROM in circuit?   

I've tried reading it in-circuit (using a SOIC-8 clip... which tend to be rather iffy) with a TL866 but all I get back is all 00 or all FF.  I tried with the meter off and on... same thing.  I think the FF's indicate a bad clip connection.   I once got a connection where a few of the read values were non-zero,  but obviously were wrong.  A re-read gave different values.

[floobydust]

I don't think you can work with the EEPROM in-circuit as you get bus contention with the DMM IC. TL866 fighting with the DMM IC probably.

I solder-wicked and then lifted up the two 24C02 EEPROM legs SDA SCL and tack-soldered tiny wires, along with  GND (3 wires total) and ran them to a programmer.
Used Arduino sketch with 3V level-translator (resistors/diode clamp) to read/write the EEPROM. #define DEVADDR 0x50    // I2C device address of 24C02 EEPROM
DMM write-protect WP jumper JP2 must be in to allow EEPROM writes. Using DMM 3V power on to run the EEPROM. DMM will give "Err03" I think if it can't see EEPROM.

This is my EEPROM contents with temp. function added. Yours will differ due to CAL coefficients. Do not overwrite yours.
So read your EEPROM, save that then edit the two bytes to allow temperature.

Attached .HEX file is from Russian forums on kazus.ru;  Has 600V alarm voltage instead of 750V I think, and no temperature enabled.

You can change auto-power off time, backlight timer, LCD contrast, alarm voltages etc.

Many people changing EEPROM contents on DMM's using the same IC like ZT101, ZT102, AN8001, AN8002, HP-890CN, HP-770HC, UT139C etc.

Code: [Select]

      0  1   2   3  4   5  6   7   8  9   A   B   C   D  E   F

00: FF FF FF FF FF FF FF FF FF 52 00 FA 00 00 BE 03

10: 10 17 0F 27 52 03 6E 50 64 4B 3C 3C 0A FF 40 FF

20: 3C 98 81 81 64 00 96 00 00 80 8D 80 00 80 FE 69

30: 4E 02 09 9C FB 09 8C 01 0A 18 FC 09 36 FC 09 00

40: 00 01 00 01 00 07 98 00 64 00 64 00 64 00 00 00

50: 00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80

60: 7B 7E EE 7F 0A 00 99 2A 00 00 00 00 00 00 00 00

70: 8B 82 00 80 AC 82 E0 7C 18 01 00 00 00 00 00 00

80: 00 00 00 00 00 16 00 10 00 0C 00 07 13 01 12 03

90: 00 00 00 00 00 00 00 11 00 0D 00 09 15 02 00 04

A0: 00 00 00 00 00 00 00 00 00 00 00 0A 00 00 00 00

B0: 00 00 00 00 00 00 00 00 00 00 00 0B 00 00 00 00

C0: 0D 00 02 10 0D 00 03 20 20 00 03 20 20 00 03 10

D0: 1F 80 FF 7F 00 80 00 80 41 00 03 05 0D 00 02 20

E0: 00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80

F0: 0F 80 FF FF FF FF FF FF 5A C7 CC 0F 0F A2 00 00
Kerry Wong has some info on his site where he was into the EEPROM.

[floobydust]

ANENG upped the price to USD $32, what is this capitalism lol

Which model did they increase the price on? I still see the AN8008 on eBay for $13 $23 from China.

My AN8008 just arrived in the mail, so far I've put batteries in it and checked that it seems to operate as expected.

Top # orders USD $32.30 now. But other vendors have original communist pricing.
https://www.aliexpress.com/store/product/ANENG-AN8008-True-RMS-Digital-Multimeter-9999-counts-Square-Wave-Backlight-AC-DC-Voltage-Ammeter-Current/

[tronde]

Instead I  added it to the mV function:
* EEPROM address 0xAC changed from 0x00 to 0x13 adds °C to mV function
* EEPROM address 0xBC changed from 0x00 to 0x15 adds °F to mV function

Can you read/write the EEPROM in circuit?   

I've tried reading it in-circuit (using a SOIC-8 clip... which tend to be rather iffy) with a TL866 but all I get back is all 00 or all FF.  I tried with the meter off and on... same thing.  I think the FF's indicate a bad clip connection.   I once got a connection where a few of the read values were non-zero,  but obviously were wrong.  A re-read gave different values.

When I read or write to the EEPROM in the DTM0660 based VC921 I clamp down the oscillator with a 1kohm resistor across the xtal. Don't know if it OK to short it with a wire. I use a cheap CH341-based programmer and a clip.

[kalel]

ANENG upped the price to USD $32, what is this capitalism lol

Which model did they increase the price on? I still see the AN8008 on eBay for $13 $23 from China.

My AN8008 just arrived in the mail, so far I've put batteries in it and checked that it seems to operate as expected.

Top # orders USD $32.30 now. But other vendors have original communist pricing.
https://www.aliexpress.com/store/product/ANENG-AN8008-True-RMS-Digital-Multimeter-9999-counts-Square-Wave-Backlight-AC-DC-Voltage-Ammeter-Current/

It sure received a lot of attention lately. Price did not rise on eBay (yet) but maybe all vendors might increase it in time? Well, I thought about this meter for a long time and in the end I got a rebranded an860b+ for less than an8008 and personally think it will provide more utility. But then, most people here are using it as their second-third-tenth meter, so being smaller is better.

[bitseeker]

Not everything is cheaper on AliExpress. Sometimes eBay listings have much better prices (and more vendors to choose from), other times not so much. It's always good to shop around.

[Gandalf_Sr]

...in the end I got a rebranded an860b+ for less than an8008 and personally think it will provide more utility. But then, most people here are using it as their second-third-tenth meter, so being smaller is better.

I looked at  the AN860B and it looks like a nice meter for the money. I already have a great bench meter and 3 regular-sized (Fluke 177) meters, I bought the AN8008 because it is small - I want to be able to have an accurate meter for low voltage/power tests while I'm travelling without the worry that someone might steal, or I might break, a $500 piece of test gear.  The AN8008 is smaller than an iPhone 7+ (except for thickness).  Going all the way down to a true pocket meter removes the 'real' meter feel and my eyes are getting old too.

[kalel]

...in the end I got a rebranded an860b+ for less than an8008 and personally think it will provide more utility. But then, most people here are using it as their second-third-tenth meter, so being smaller is better.

I looked at  the AN860B and it looks like a nice meter for the money. I already have a great bench meter and 3 regular-sized (Fluke 177) meters, I bought the AN8008 because it is small - I want to be able to have an accurate meter for low voltage/power tests while I'm travelling without the worry that someone might steal, or I might break, a $500 piece of test gear.  The AN8008 is smaller than an iPhone 7+ (except for thickness).  Going all the way down to a true pocket meter removes the 'real' meter feel and my eyes are getting old too.

Fortunately, they make them with larger displays than some older models (e.g. DT830):



Of course, Aneng also has a large display and more functionality.

Even Victor has a large enough display:


Of course, this is all relative. I guess that most high end meters all have a large display to show all the parameters.

[stevelup]

I bought mine from this eBay seller:-

13proteamonline

It took 11 days to arrive in the UK. Cost was £14.89

[Gandalf_Sr]

Buyers Beware
I bought my AN8008 from easydeal88 on Amazon - they sent me a 'gift', some kind of 5 cent plastic bag that covers remote controls, and that arrived late July.  After I complained and asked for my money back, they sent me the actual item.  I ordered July 15th, the AN8008 arrived Aug 5th.

Amazon don't make it clear that the item ships from China and I feel conned because I paid more than it was listed for on eBay because I thought I'd get better service - I was VERY wrong.  I would probably buy from eBay if I bought another one.

All that said, the AN8008 that I eventually received seems like it is a keeper.

[kalel]

Buyers Beware
I bought my AN8008 from easydeal88 on Amazon - they sent me a 'gift', some kind of 5 cent plastic bag that covers remote controls, and that arrived late July.  After I complained and asked for my money back, they sent me the actual item.  I ordered July 15th, the AN8008 arrived Aug 5th.

Amazon don't make it clear that the item ships from China and I feel conned because I paid more than it was listed for on eBay because I thought I'd get better service - I was VERY wrong.  I would probably buy from eBay if I bought another one.

All that said, the AN8008 that I eventually received seems like it is a keeper.

After going through that trouble, hopefully it will serve you well for a long time.

[Fungus]

ANENG upped the price to USD $32, what is this capitalism lol

Looks like there might be a world shortage after Dave's video.

[Gandalf_Sr]

After going through that trouble, hopefully it will serve you well for a long time.

Thanks Kalel 

Looks like there might be a world shortage after Dave's video.

maybe Dave's in cahoots with the cheap Chinese meter factory?  We'll know soon if he gets one of those posh Oz hats with the wine corks hanging from it

I changed my 100 uF electrolytic to 2 x 1206 47uF Tanceram caps (fancy ceramics) that I had in a sample box, I can't seem much difference before and after when scoping the 3.3 volt rail, still looks noisy - I did screen captures if you guys want to see them.  I also fixed some dry looking joints on the fuse holders.

Tested volts and current against my calibrated Keysight 34461A, volts are spot on, amps are slightly low: 34461A = 3.02 A, AN8008 = 2.98 A.  34461A = 301 mA, AN8008 = 299 mA.  Maybe I messed up the calibration some when I improved the soldered joints on the fuse holders as now there will be less input resistance.  Maybe it was like this before I started it may even be in spec - I didn't check before getting out the soldering iron, I 'fixed' it when I saw they looked dry.  Anyone know how to calibrate the AN8008?  I guess I could try to tweak cal when/if I swap the shunt resistors out.

[rdl]

It's been nearly a month since Dave's video and I still can't find anyone selling them that's located in the US. I guess I'll have to buy one from China.

[Fungus]

Anyone know how to calibrate the AN8008?  I guess I could try to tweak cal when/if I swap the shunt resistors out.

Simple: You just have to reprogram the little external EEPROM with new values!

[texaspyro]

I did a few quick checks on my units.   Voltage was dead on (I checked mostly in the 1.0 .. 10V area) using a Valhalla DC calibrator and a Fluke 732B.  At 5V there was a 1 mV offset when swapping the lead polarity.

Frequency was dead on at 5 and 10 MHZ (HP-5071A cesium beam oscillator).  Counter goes to at least 20 MHz (limit of the pulse generator I had handy).

SR-104 resistor was dead on at 10 K.   Readings of a ESI DB877 decade box were pretty much spot on.   Lead resistance was 0.06 ohms.  The meter takes a few seconds to settle to a final value.

Capacitance agreed quite well with a Genrad 0.1% decade box.  it would be nice if you could null out the lead capacitance...

My current and AC calibrators were in use elsewhere, so I did not check those.

All in all, not to shabby for a $15 pocket meter.  From posts in this thread, the only real wart on these meters if the low milliamp readings.  I'd like to modify my eeprom to add temperature and turn off the backlight timeout.


 

[b_force]

there is still a lot available on ebay btw.

[Fungus]

there is still a lot available on ebay btw.

I'm sure there's a lot of eBay sellers who'll be happy to take your money then go down to the Shenzhen Market to see if they can find one, yes.

Can't find one? Never mind, the customer can wait a few days, just blame it on the postal system... 

[b_force]

there is still a lot available on ebay btw.

I'm sure there's a lot of eBay sellers who'll be happy to take your money then go down to the Shenzhen Market to see if they can find one, yes.

Can't find one? Never mind, the customer can wait a few days, just blame it on the postal system... 

If you want fast shipping, simply don't order on Ebay/overseas. 

[Fungus]

there is still a lot available on ebay btw.

If you want fast shipping, simply don't order on Ebay/overseas. 

It's almost as if you haven't been reading the last two pages of this thread... 

But yes, I'm sure one will turn up eventually if you order today.