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Hioki DT4282 handheld multimeter, High resolution tear down images
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HKJ:

--- Quote from: Fungus on May 05, 2018, 11:06:36 am ---Oh, right. I missed the arrows...  :palm:  :palm: :palm:

--- End quote ---

My review also has a set of high-res tear down photos: https://lygte-info.dk/review/DMMHioki%20DT4282%20UK.html
What you have trouble seeing in one set of photos, might be visible in the other set.
Synthtech:

--- Quote from: mikeselectricstuff on May 05, 2018, 11:00:05 am ---
--- Quote from: Synthtech on May 04, 2018, 09:26:07 pm ---Hioki make their own custom multimeter IC which they claim is the reason for the high speed of their meters. Can you see which IC in there has “Hioki” stamped on it? Hard to tell from the pictures.

--- End quote ---
There is no custom chip in this model ( unless they mean the programmed MCU!)

--- End quote ---

Interesting. I thought that there was a Hioki stamped chip in the lower model that Dave tore down in his video a while back. I did some DC voltage comparisons last week with the Hioki DT4282 which is over a year old now and never calibrated against my Keysight U1282A which is still within 1 year of it’s last visit to the cal lab and the Hioki was closer to the readings on my 6.5 digit bench meter than the U1282A on every setting on my DC voltage reference. It also autoranges much faster than the Keysight meter. Whatever Hioki is doing in there it is a very accurate meter for a handheld.
hgjdwx:
First explain that my English is not good and I use Google Translate.
I have a DT4282 that has been in use for more than two years.
The DT4282 has many advantages. Some of its features are not comparable to other hand-held multimeters.
Like its DCV range and resistance range speed, resistance range accuracy, and stability, temperature drift and so on.
There is 1uV resolution and stability of the DCV I appreciate and often use.
There is also a very good frequency response of its ACV.
And its ultra-fast PEAK function.
The above mentioned are far superior to other hand-held multimeters of the same grade.
But I also see  many disadvantages  it is:
It does not have an analog bar, the continuity test response time is 10mS, the display shows dark,
Only voltage AC+DC function, no current AC+DC function, AC voltage, current speed is not fast,
Capacitance is very slow, and AC voltage and current mantissa are forced to zero within the word is below "999".
Large reading range when the signal  above 100 KHz  for ACV measurements, and the upper limit for frequency measurement is 500 KHz, and
The frequency of many test signals cannot be displayed, and sometimes the manual switching range does not respond.
PEAK function does not have mV range, AC+DC and AC/DC dual display have no mv range.
The FILTER function has only 600V  and 1000V range and no 6V and 60V range.
The recalled stored data and current measurement data cannot be displayed in the same screen.

So I made the following suggestions to the manufacturer:

Functional improvements:
1: Continuity test response time increased to 1ms, and Increase resolution to 0.01OHM
2: Use high-brightness, high-contrast display (just now display is dark)
3: Diode range increases resolution to 0.0001V
4: Open circuit of resistance range is changed to "OL" without flashing
5: Increase the measurement speed of the capacitor
6: Cancel auto-zero function in “999” character of AC range
7: Increase the AC speed and AC/DC dual display measurement speed, and instead when performing AC/DC dual display automatic speed measurement, the ranges of AC and DC are not related and the ranges are independent.
8: Improve the reading stability of the signal above 100KHZ by ACV (currently the reading is too large)
9: Increase the upper limit of the frequency measurement range and improve some frequencies can not be displayed
10: Improvement Sometimes transform Range Does Not Respond
11: Improvement: The “?”, “?” and “RANGE” keys on the right side of the panel together constitute the quick function key for range switching, similar to the desktop multimeter

Increased functionality:
1: PEAK function increases mv range
2: increase the recalled stored data and the current measurement data with the screen display
3: FILTER function increases 6V, 60V range
4: Increase the low impedance mode function
5: Add analog bar display
6: Increase range indication
7: increase the maximum, minimum, present value (real-time measurement) with the screen display
8: increase the positive peak, negative peak, present value (real-time measurement) with the screen display
9: AC+DC and AC/DC dual display increase the mv range
10:  Add current AC+DC function.
11:  Add automatic power off time setting function.
fanOfeeDIY:

--- Quote from: hgjdwx on May 05, 2018, 12:54:02 pm ---So I made the following suggestions to the manufacturer:

Functional improvements:
1: Continuity test response time increased to 1ms, and Increase resolution to 0.01OHM
2: Use high-brightness, high-contrast display (just now display is dark)
3: Diode range increases resolution to 0.0001V
4: Open circuit of resistance range is changed to "OL" without flashing
5: Increase the measurement speed of the capacitor
6: Cancel auto-zero function in “999” character of AC range
7: Increase the AC speed and AC/DC dual display measurement speed, and instead when performing AC/DC dual display automatic speed measurement, the ranges of AC and DC are not related and the ranges are independent.
8: Improve the reading stability of the signal above 100KHZ by ACV (currently the reading is too large)
9: Increase the upper limit of the frequency measurement range and improve some frequencies can not be displayed
10: Improvement Sometimes transform Range Does Not Respond
11: Improvement: The “?”, “?” and “RANGE” keys on the right side of the panel together constitute the quick function key for range switching, similar to the desktop multimeter

Increased functionality:
1: PEAK function increases mv range
2: increase the recalled stored data and the current measurement data with the screen display
3: FILTER function increases 6V, 60V range
4: Increase the low impedance mode function
5: Add analog bar display
6: Increase range indication
7: increase the maximum, minimum, present value (real-time measurement) with the screen display
8: increase the positive peak, negative peak, present value (real-time measurement) with the screen display
9: AC+DC and AC/DC dual display increase the mv range
10:  Add current AC+DC function.
11:  Add automatic power off time setting function.

--- End quote ---

Have you had any feedback from the manufacture?
Fantastic suggestions. :)
bluey:

--- Quote from: Synthtech on May 05, 2018, 12:11:54 pm ---
--- Quote from: mikeselectricstuff on May 05, 2018, 11:00:05 am ---
--- Quote from: Synthtech on May 04, 2018, 09:26:07 pm ---Hioki make their own custom multimeter IC which they claim is the reason for the high speed of their meters. Can you see which IC in there has “Hioki” stamped on it? Hard to tell from the pictures.

--- End quote ---
There is no custom chip in this model ( unless they mean the programmed MCU!)

--- End quote ---

Interesting. I thought that there was a Hioki stamped chip in the lower model that Dave tore down in his video a while back.

--- End quote ---

Hioki HAZ01 DMM IC from 2015 is described in hioki technical report. It is fitted to DT425x and DT422x models which have best accuracy of 0.3%.
https://www.hioki.com/file/cmw/hdTechnicalDataEn/30/attached_file/?action=browser&log=1&lang=en

Possibly they could use in this class meter with higher quality external voltage reference. I’m guessing the design of this model is well established and there is no advantage to integration until they do a new model.
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