Апгрейд "анти-капли" HP-890CN

[uncle_sem]

не проверяет напряжения и вольтаж через один выход

а напряжение и вольтаж это не то же самое?

[flagmax]

а напряжение и вольтаж это не то же самое?

Спасибо за подмену. Думая правильно скорректировал на напряжение и силу тока. По английски это Voltage и Current.

[3zero3]

Hi, everyone!

First, I want to apologize, for writing this in English. I do not know Russian, but little English.

This topic is pure gold for DTM0660, as much as I can see.

I bought Richmeter RM102 from Ali.

There is (are) some unusual behavior(s) on frequency meter range.

I tried to measure frequency of mains (230 V, 50 Hz).

Sometime it is succesful.

Sometime it is succesful for about first one-two seconds, then there are some random numbers on display.

Sometime just show random numbers. I do not believe, that mains so "dirty", that frequency-meter cannot show the right value.

Sometime, when I put RM102 to frequency-meter and try to measure frequency of mains (just put probes), suddenly there is battery icon on display and I immediately remove probes. That happen with even with completely new duracell AAA battery.

Sometime, little spark (when putting probes) can be seen in dark room.

All of this is so weird for me, because everything is working here:

Видео:

(See 8:12)

What do You think, people?

Should I open dispute on Ali? (have about 4 days)

Another once, I apologize for not writing in Russian, because I do not know.

[slsc]

Hi, everyone!
Sometime, little spark (when putting probes) can be seen in dark room.

a small spark in HZ mode can be caused by a capacitor charge (0.1μF), which connected to pin 25 DTM0660

[3zero3]

I thought and suppose, some capacitor must be charged.

Thank You.

I forget to say something interesting.

Put selector to frequency-meter, wait to auto-power off (about 15 min). Multimeter cannot be switch on by pressing yellow button (function). With any other range, RM102 will switch on by press yellow (function) button.

I do not know, is it should working like that?

[alvadep]

Yes, it must be so. In this position of the selector, the yellow button is switched over other function. In this mode, the yellow button has the function Hz /%.

[3zero3]

Thanks.

Yeah, I know for switching function with yellow button.

But, when I leave RM102 for 15 min, to make auto-power off, selector on frequency range, I cannot to "wake up" RM102 from "sleep", from standby by press yellow button. This only happen on frequency range.

With any other range, I can wake up Richmeter from standby by simply press yellow button.

I do not know, is it normal?

My logic say, it must to wake up from "sleep" (on frequency range) by only press yellow button.

[alvadep]

Wake on only the SELECT button.
Physically the button is one, but at different positions of the selector its contacts are connected to different lines.

[3zero3]

I realized. I understand.

Thanks for drawing situation.

Physically, there is no SELECT button to push, in frequency range, cause there are only two (physical) buttons on RM102.

How stupid I am.

[konstr]

На плате zt101 написано 20А . Если заменить предохранитель, то можно ли мерить до 20 а или это черевато последствиями?