New ANENG Q1 9999 Counts ?

[all_repair]

My Aneng Q1 was unused for some time, after that, it just selects the functions and incorrect reading in the DC and AC scale.

Test with a new battery

[wandows]

I tested with a new battery but the problem remains!

[Fungus]

Take it apart, clean the rotary switch contacts and PCB.

Are you sure nothing bad happened the last time you used it? What did you measure with it?

[wandows]

The batteries leaked a little and I took the opportunity to disassemble it and clean it as you mentioned.

Before that, no wrong measurements were taken (this Aneng is not always used).

[Fungus]

The batteries leaked a little

In other words: Something bad did happen. Why didn't you mention that?

The PCB could be contaminated, the rot could even have got inside a component which would be difficult to fix. You could try scrubbing with IPA and a brush but at this price you're probably better off getting a new one.

And don't use any more alkalines in stuff that goes long unused for long periods.

[wandows]

The batteries leaked a little

In other words: Something bad did happen. Why didn't you mention that?
It was a big oversight not to mention it, I'm sorry!


The PCB could be contaminated, the rot could even have got inside a component which would be difficult to fix. You could try scrubbing with IPA and a brush but at this price you're probably better off getting a new one.
Now it's complicated the situation

And don't use any more alkalines in stuff that goes long unused for long periods.
It was a big lack of attention, unfortunately!!!

[Fungus]

And don't use any more alkalines in stuff that goes long unused for long periods.

It was a big lack of attention, unfortunately!!!

It's something we've all been through. 

https://www.eevblog.com/forum/chat/durahell-batteries/

[trobbins]

I have had two 8009's for nearly 4 years and I use them both a lot on the bench.  There is a lot of convenience about a small battery operated DMM, especially when multiple realtime measurements are needed on a device and where some measurements are floating at hazardous levels.  Mine remain accurate against 5-6 digit meters so far.  The only growing inconvenience has been the zero level for resistance, where the dial switch resistance can be substantial and require a resetting of the dial to make a good zero level - that is not a show stopper for me as I am frugal with my test instruments and so just confirm the zero level if the application needs to know that zero is zero.  I bought the two units when 8009's were cheap, with a full awareness of likely longevity issues, so have no regrets at all with their present operating condition.  The only change to default operation is the use of different test leads and clips.

It would be interesting to know if anyone has been using the Q1 approaching that amount of time and has noticed degradation or inconvenience related to the relay's operation, or front panel switches, as those are likely the main difference between models and longevity.

[floobydust]

My AN8008 is working fine after I used PPE contact cleaner (DeOxit) on the rotary switch. Before it was awful, high (zero) ohms readings, power cutting in and out. It's the crappy copper wipers oxidizing. I'd used oil, grease, teflon lube etc. but nothing lasted. Now it's around 0.15 ohms leads shorted in ohms-mode and consistent, reliable.
The little 8-bit MCU it's written in assembly language and minimal OTP or mask ROM memory, so I wouldn't expect the feature really needed- NULL or ZERO.

For the Q1, as always gold is expensive but necessary on signal relays. Hongfa HFD2/003-M-L2-D relay, "D" option is Ag+gold plated contacts, latching 3V coil.
So I'd expect gold on both sides and a bit of sealing, should beat a cheap rotary switch?
What I don't like about latching relays in multimeters is any bump knocks them to the other latching position, which can be a mess.

[blueninja]

Can anyone post a firmware dump of this Multimeter? I believe I have messed mine up.

[floobydust]

There is no firmware to "mess up" so are you trying to copy the product? That would greatly upset our multimeter overlords.

[ataradov]

There is an I2C EEPROM IC on the board, but I'm not sure it stores the firmware. It is only 1 KB in size, and mostly likely stores calibration values that would be unique to each meter anyway.

[blueninja]

It’s not firmware, but it has calibration values and device settings. Without them it won’t operate. Can you post a copy so I could fix mine?

[indman]

blueninja Good luck repairing!

[ialbert]

I owned q1. Years ago. It did work ok. But one day most of the value it dives are bad.
It needs calibration.

[all_repair]

I owned q1. Years ago. It did work ok. But one day most of the value it dives are bad.
It needs calibration.

change battery first

[wandows]

Hey guys!
Unfortunately I have a problem with my aneng Q1.

When measuring the current consumption, I mistakenly placed the test leads in place for a maximum of 200mA, but the consumption exceeded 200mA, and as a result the multimeter only turns on and beeps but does not display any information on the display.
Another interesting detail is that when I put the multimeter on the DIODE scale, it beeps continuously.
I also verified that R18 broke and Q5 was open, but even after replacement the problem persists.

Do any of my friends have any suggestions to help me solve this problem?

Thank you very much in advance!

[Fungus]

What did you connect it to? There should be a fuse inside these to protect against this.

It sounds like it's very broken, maybe the chip is blown and it can't be repaired.

At this price I'd just replace it.

[Atlan]

On AliExpress, I discovered stabilizers 3V0

€1.73 | 2x 3.3-6V to 3V DC-DC Step-Down Power Supply Buck LDO Module Voltage regulator Board for 18650 li-ion AAA Dry cell batteries
https://a.aliexpress.com/_EJHonrb

 (max 300mA) with a low voltage drop and a consumption of 0.008mA. When a given multimeter sees a little more current. I installed the battery (glued with double-sided tape) and charging circuit. The connector is glued with instant glue. More on the pictures. The question is whether the glue from the charging circuit holder won't melt

P.S:The battery had to be turned the other way around so that the wires went directly to the charging module.

[Atlan]

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[Atlan]

Set autopower OFF to 15 min