DMM Aneng Q1

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This is a new (Spring 2018) meter with the Aneng label and without a traditional range switch, instead it uses some buttons. The display is inverted and always use the backlight to be readable.

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It did not include a box, but was delivered in an envelope that contained the pouch.

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Everything was inside the pouch.

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It included the DMM, two pair of probes, a thermosensor and a manual.

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The standard probes has removable tip covers. It is rated CAT II 1000V with covers and 600V without.

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The other set of probes feels rather low quality, but has some nice functions. They consist of two wires with threads at both ends and a couple of different tips that can be mounted in each end. It is slow to use, but very flexible.

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Here are all the different tips.

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The thermosensor is a real probe, not just the small bead at the end of wires.
I am not convinced that this is better than the bead, that is smaller and easy to stick on just about any surface with some sticky tape (Buying one as supplement is cheap).

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The red plastic is hard and smooth, the black is slightly soft and feels rubberized
When on the tilting bale the meter will slide when the buttons are pressed.

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Display

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The above picture shows all the segments on the display, the bargraph is cheating, the segments are grouped and turns on together, the means the actual resolution is about 30.
Not all the segments are used on this meter.

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In DC, ohm, capacity only one value is shown, the secondary display is not used.

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In AC the secondary display will show frequency or duty cycle.

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In temperature the secondary display is used for Fahrenheit, it is not possible to swap the two values.

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Non contact voltage will show from one to four bars depending on the electric field strength.


Functions

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Buttons: There is no switch for current, it will automatic be selected when a plug is inserted in uA or A terminal.



Input

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Standard probes will work, but can not be fully inserted.
The A & uA terminals both are 19mm from the COM terminal.



Measurements 1uF

A look at the capacity measurement waveform.

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Frequency input resistance.

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The uA range uses about -88uA for sense and has a -18mV offset on both AC and DC, the meter is precise on the range, but this affect the burden voltage.
A range will heat up near 10A and drift significantly (0.5A).




Tear down

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Four screws and the back could be removed.

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3 more screws and a few clips to remove the circuit board. The current terminals do not slide easily out and it was easier to desolder them.

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The current input uses split terminals with a connection to each sides, this gives a total of 4 connections that is routed to the main board.

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The display was four screws and two clips. There is two leds on the display for background light.

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The two current inputs uses the 4 pin, two for sense and two for sense. i.e. one of the pins carry up to 10A. The 10A shunt (R28) is just a piece of wire and fairly thin together with a trace on the circuit board (Sense wire is connected at the fuse). The uA shunt (R29 & R30: 1ohm & 99ohm) is two resistors (One of the resistors could be used as a mA shunt). To protect the two resistors is a Zener diode (D5). The sense input goes to some smd resistors (uA to R32: 10k, AmA to R17: 10k), this will put a serious limit on maximum voltage with a blown fuse.
Voltage input has the usual input resistor (R21 & R39: 2x5Mohm) and also a direct connection to the relay (HFD2/003-M-L2-D). The relay is a latching relay with two toggle contacts, this means a pulse will change position and no power is needed to hold the position, this is very useful for battery powered equipment. Both contact are in parallel and only one position is used to route around the input resistor. The signal goes to the PTC (PTC1) and a resistor (R14: 910k). After the PTC is a transistor pair (Q6 & Q7) for protection.
The chips are the main multimeter IC under the black blob, a reference (DZ1: ICL8069), a EEPROM (IC1: K24C08) and a microprocessor (U2: Without code) to translate the switches and input sense to range switch coding.
At the top of the circuit board is the NCV antenna with some pull down resistor (R26, R33, R34: 3x20Mohm).

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This side only has the pads for switches and the LCD display. The LCD pads are fairly large, meaning the placement of the LCD display are fairly uncritical.

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Conclusion

The CAT rating is, as usual, way to high, a meter with 250V fuses cannot be rated for 600V or 1000V.
This meter has a different design with a black LCD and no rotary switch, the functions are about the same as many other meters and is a good standard meter (Except mA range is missing), there are no advanced functions.
Because the backlight must be on at all times, the battery do not last as long. The display can be difficult to see in bright sunlight.

The meter is a nice hobby meter, but the real reason to get it is for the design (If you like it).



Notes

This meter may exist with many different names on it and small variations in functions.

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