DMM Amprobe AM-510-EUR

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This DMM has all the normal functions and a few extra.

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It included the DMM, a pair of probes, a safety information sheet and a mini CD with the manual (It can also be downloaded).

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Probes are branded with Amprobe and rated for 10A

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The probes has removable tip covers with CAT ratings (The DMM do not have as high CAT rating as the probes).

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The plug is fully shrouded.

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The meter has a led at the front for flashlight usage, it is behind a plastic window.

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The tilting bale works very well, it is easy to extended and the rubber secures the meter do not slide around when pushing buttons or turning the range switch.

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Display

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The above picture shows all the segments on the display.

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Typical display during usage, it will show the number and what measurement is selected.



Functions

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Buttons:
Rotary switch:

Input

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Measurements
1uF

A look at the capacity measurement waveform.

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Tear down

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3 screws (One was for the battery cover) and the back could be removed.

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3 more screws for the circuit board and two for the lcd cover.

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Notice the isolation wing on one of the current input terminals, with a blown fuse they must withstand a lot of voltage.

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The circuit board is shaped to fit exactly in the case with indents that that match the case.

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There is two ceramic fuses, one for mA/uA (F1:500mA) and one for A (F2:10A), the diodes above the input terminals is for protecting the mA and uA current shunts against over current. There is also a MOV near the mA/uA fuse (RV4: 10D180k, 18V full clamp at 36V), it will clamp voltage in battery test mode. The resistor besides the diodes (RP1: 1kOhm) is probably for the 9V testing.
At the volt terminal is a PTC followed by a 500ohm resistor (One of the MOV's is connected before the resistor), this is probably used for ohms/capacitor current output, but also for voltage input. At the top of the circuit board is the led for the flashlight and the antenna for the NCV detector.
Q1, Q2 and D13, D14 is probably input protection for different ranges.
There is also a couple of trimpots (VR1..VR4, VR7) on the circuit board, these are probably the reason for the calibration is not spot one (It can be hard to adjust trimpots precisely).

One interesting detail is the fuses, the circuit board can be mounted with holders for both long and short fuses, in this meter the mA fuse is long and the A fuse is long, I wonder why.

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Near the mA/uA & COM inputs we have the current sense resistors for uA (R8: 99ohm), uA (R9: 1ohm) and 1.5V battery test (R11A & R11B 2x62ohm in parallel). Near the current terminal a input voltage divider (R71A, R71B, R71C: 3x3.3M in series), it is connected to the mA/uA input terminal and is probably used for battery testing.
There is also a 10MOhm input near IC1 (R2A, R2B, R2C, R2D: 4x2.5MOhm), it is feed from after the 500ohm resistor (RR)
The main voltmeter chip (U1) is a COP, making it impossible to see the number.
There is two (Probably) OpAmp (U2 & U3: GZ534).
The switch for the flashlight is a regular switch (SW6).

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Conclusion

This meter has all the usual functions and a some extra like flashlight, battery test and NCV. As usual the burden voltage in the high mA is rather high, the meter is missing mVDC and capacity measurements only goes to 100uF
The meter has a lot of protection and the fuses are rated for 600V.

This meter looks like it is fine for mains voltage and anything below.



Notes

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