Author Topic: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)  (Read 1068 times)

0 Members and 1 Guest are viewing this topic.

Offline HighVoltage

  • Super Contributor
  • ***
  • Posts: 4674
  • Country: de
Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« on: June 03, 2021, 12:09:46 pm »
This HIOKI DM7276-01 has been added to my lab.

It is advertised as a 9ppm/year 7 1/2 digit DC Voltmeter with touch screen a very small footprint and lightweight.

Some specs:
- 100 mV ( ±120.000 00 mV) to 1000 V ( ±1000.000 0 V ), 5 ranges
- High-accuracy model with 1-year 9ppm Accuracy
- Capacitance contact check (using built-in C-monitor)
- Supports global production with built-in variable power supply
- Built-in EXT I/O, LAN, and USB
- Outstanding Long-term stability and Temperature characteristics
- Excellent noise performance approaching an 8-½ digit DMM
- Specifications ideal for everything from R&D to production lines at ¼ the conventional costs

I am just starting using this instrument and the first thing that is noticeable is its very fast warmup time from around 3 min, maybe less.

Stay tuned, first measurements should be interesting.

Anyone here having experience with this instrument?
There are 3 kinds of people in this world, those who can count and those who can not.
 
The following users thanked this post: Andreas, Vgkid, doktor pyta, bsw_m, ch_scr, MegaVolt, eplpwr

Offline MegaVolt

  • Frequent Contributor
  • **
  • Posts: 455
  • Country: by
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #1 on: June 04, 2021, 07:49:57 am »
A very interesting find !!
How much did it cost?

Can you share the documentation that is only available upon registration? "Instruction Manual", "Communication Command Instruction Manual".
I am already myself :))
« Last Edit: June 04, 2021, 08:28:47 am by MegaVolt »
 

Offline MegaVolt

  • Frequent Contributor
  • **
  • Posts: 455
  • Country: by
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #2 on: June 04, 2021, 08:17:31 am »
Teardown? :)))))))))))))))
 

Offline HighVoltage

  • Super Contributor
  • ***
  • Posts: 4674
  • Country: de
There are 3 kinds of people in this world, those who can count and those who can not.
 

Offline HighVoltage

  • Super Contributor
  • ***
  • Posts: 4674
  • Country: de
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #4 on: June 04, 2021, 08:52:39 am »
Here I tested the warmup time of the DM7276.

My LTZ1000 reference was warmed up well, so no influence from that.
This little peak shortly before 2 min seems normal for this instrument.
It seems within 2 min this DM7276 is warmed up to get reliable values.
And this is even faster than the Keithley DMM7510.



There are 3 kinds of people in this world, those who can count and those who can not.
 
The following users thanked this post: MegaVolt

Offline HighVoltage

  • Super Contributor
  • ***
  • Posts: 4674
  • Country: de
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #5 on: June 04, 2021, 08:58:53 am »
In this picture the Hioki DM7276 was hooked up to my LTZ1000A reference over night
Settings:
- 100 NPLC
- Smoothing filter ON with 5 average readings

The nominal value of my LTZ1000 reference is 7.065,90xV
For comparison I had the Keithley DMM7510 running in parallel to the Hioki.

There are 3 kinds of people in this world, those who can count and those who can not.
 
The following users thanked this post: Mickle T., MegaVolt, Trader

Offline MegaVolt

  • Frequent Contributor
  • **
  • Posts: 455
  • Country: by
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #6 on: June 04, 2021, 09:05:20 am »
It is twice as noisy as the 7510...
 

Offline Kleinstein

  • Super Contributor
  • ***
  • Posts: 9238
  • Country: de
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #7 on: June 04, 2021, 03:44:55 pm »
It is twice as noisy as the 7510...

The factor is visible from the example data, but AFAIK the DMM7510 is very mixed perfomance when it comes to noise. For the data I have see, it is very good in the 100 mV range and also good with short integration like 1 PLC. However with 100 PLC the performance is not that great and a bit disappointing - at least with a lower applied voltage. With the test at 10 V the references could be a main factor.

Both meters are not really made for ultimate precision at 100 PLC. The main use is more like relatively fast production tests at 10 PLC or 1 PLC, often with a scanner.
 

Offline 3roomlab

  • Frequent Contributor
  • **
  • Posts: 808
  • Country: 00
  • Did COVID 19 make you do strange things?
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #8 on: June 04, 2021, 04:57:51 pm »
nice !
i remember this unit, i was browsing around for comparisons while sitting on this thread (https://www.eevblog.com/forum/blog/eevblog-1382-keysight-edu34450a-5-5-digit-bench-multimeter-teardown/msg3529364/#msg3529364)
i remember my surprise seeing hioki made some new stuff with "big pixel" screens
i thought then the 1 yr spec is quite impressive for a $2.7k unit (9 +1.2 ppm)
7510 is 2x the price (14 +1.2 ppm).

im curious about the alan variance compared to 7510  :P
https://www.eevblog.com/forum/testgear/keithley-dmm7510-smu-2450-2460-problems/50/
https://www.eevblog.com/forum/metrology/dmm-adc-noise-comparison-testing-project/msg1323877/#msg1323877
https://www.eevblog.com/forum/metrology/dmm-adc-noise-comparison-testing-project/msg1153241/#msg1153241
how much noise is too much noise?
 

Offline Kleinstein

  • Super Contributor
  • ***
  • Posts: 9238
  • Country: de
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #9 on: June 04, 2021, 06:31:42 pm »
The Hoki meter is a voltmeter only - so no shunt and not current sources for resistance. This allows for a lower price.
Chances are the accurcy specs for the 10 V range are to a large part limited by reference drift. The external temperature regulation for the LTFLU in the DMM7510 has some disadvantage in this respect. The specs are also only estimates about future performance - the actual performance is usually better, but unknown upfront. Some estimates are more conservative than others.
 
The following users thanked this post: MegaVolt

Online guenthert

  • Frequent Contributor
  • **
  • Posts: 497
  • Country: us
Re: Hioki DM7276-01 Precision DC Voltmeter (9 PPM)
« Reply #10 on: June 06, 2021, 05:41:10 pm »
     It's even a DC-only voltmeter, which further simplifies the input stage and eases timing requirements (while the 3458A is often praised here for its precision and linearity, it was really its speed which puts it ahead, more so in '89).

     I was even wondering why they bother with a multi-range DC-only voltmeter.  Why not make it 10V only, simplifying the input stage even further (making it cheaper or more precise) and selling it as digitizer?  Seems they are eyeing the currently hot battery market.   :-//
« Last Edit: June 06, 2021, 05:43:38 pm by guenthert »
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf