Digital multimeter M890G. Electric scheme, description, characteristics. Scheme, description

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Digital multimeter M890G. Electrical diagram, description, characteristics. Encyclopedia of radio electronics and electrical engineering

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Digital multimeter M890G. Wiring diagram, description, characteristics

Description

The M890G multimeter is a compact, wear-resistant, pocket-sized multimeter designed to monitor DC and AC voltage, DC current, resistance, capacitance, frequency, temperature, check diodes and transistors, continuity.
Double integration CMOS ADC with automatic zero correction, automatic polarity detection and overload indexing. Overload protection is provided up to the specified limits.
Ideal for use in the field, laboratory, workshop and household.
Display - 3 1/2 - digit, 7-segment liquid crystal indicator.
Power supply: one 9-volt battery type 6F22. Dimensions: 88x170x38mm. Weight 340g.
Accuracy is guaranteed for 1 year at 23±5°C and less than 75% relative humidity.

Features

Power switch - ON-OFF key.
One 30 position switch to select the type of work and/or limit.
High sensitivity - 100 microvolts.
Automatic overload indication - "1" in the most significant digit.
Automatic detection of DC voltage or current polarity.
All limits are overload protected.
Resistance testing from 0,1 ohm to 200 MΩ.
Capacitance test from 1pF to 20 uF.
Testing diodes with a fixed forward current of 1mA.
Checking transistors at I \u100d XNUMX μA.
temperature measurement

Technical specifications

Constant pressure

Limit	Resolution	Accuracy
200 mB	100 µV	±0,5% ±1count
In 2	1 mV	±0,5% ±1 count;
20 B	10 mB	±0,5% ±1count
200 B	100 mB	±0,5% ±1count
1000 B	1 B	±0,8% ±2count

Input impedance:

10 MΩ on all limits.

Overload protection:

1000V DC current or peak. per. current on all limits

AC voltage

Limit	Resolution	Accuracy
2 B	1 mB	±0,8% ±3count
20 B	10 mB	±0,8% ±3 count;
200 B	100 mB	±0,8% ±3 count;
700 B	1 B	±1,2% ±5 count;

Input impedance:

Overload protection:

Calibration:

Frequency range:

10 MΩ on all limits.

750 V eff. or 1000 V peak continuous at AC voltage limits excluding the 200 mV range.

in eff. syn. signal

40Hz - 400Hz

D.C

Limit	Resolution	Accuracy
2 mA	1 µA	±0,8% ±1count
20 mA	10 μA	±0,8% ±1 count;
200 mA	100 μA	±1,2% ±1count
A 20	10 mA	±2% ±5count

Overload protection:

Maximum output current:

fuse 0,2A / 250V (20 A limit is not protected).

20 A, 15 seconds.

Alternating current

Limit	Resolution	Accuracy
200 mA	100 μA	±1,8% ±3count
A 20	10 mA	±3% ±7count

Overload protection:

Frequency range:

Maximum output current:

Calibration:

fuse 0,2A / 250V (20 A limit is not protected).

40Hz - 400Hz

20 A, 15 seconds.

in eff. syn. signal

Resistance

Limit	Resolution	Accuracy
200 ohm	0,1 ohm	±0,8% ±3count
2 kΩ	1 ohm	±0,8% ±1 count;
20 kΩ	10 ohm	±0,8% ±1count
200 kΩ	100 ohm	±0,8% ±1count
2 MΩ	1 kΩ	±0,8% ±1count
20 MΩ	10 kΩ	±1% ±2count

Overload protection:

Note:

15s maximum 200V rms on all limits.

At the limit of 200 MOhm, when the probes are shorted, the display reading will be 10 units, which should be subtracted from the reading.

Емкость

Limit	Resolution	Accuracy
2000 pF	1 pF	±2,5% ±5count
20 nF	10 pF	±2,5% ±5 count;
200 nF	100 pF	±2,5% ±5count
2 uF	1 nF	±2,5% ±5count
20 uF	10 nF	±2,5% ±5count

Temperature

Interval	Resolution	Accuracy
-50 ° C ... 400 ° C	1°C	±0,75% ±3count
400 ° C ... 1000 ° C	1°C	±1,5% ±15 count;
** 0°C...40°C	1°C	± 2%

Built-in temperature sensor.

Frequency

Limit	Resolution	Accuracy
20 kHz	10 Hz	±1% ±1count

Overload protection:

220 V eff. alternating current

M890 series multimeters (comparison table)

Model	Constant pressure	AC voltage	D.C	Alternating current	Resistance	Diode test	sound probe	Checking transistors	Auto off	Frequency	Temperature
890B +	+ (+200mV)	+	+	+(+2mA,20mA)	+	+	+	+	-	-	-
890C	+	+	+	+	+	+	+	+	-	-	+
890D	+	+	+	+ (+20mA)	+	+	+	+	-	-	-
890F	+	+	+	+	+	+	+	+	+	+	-
890G	+	+	+	+	+	+	+	+	+	+	+

Average price: 20-25$

Below is the M890G digital multimeter circuit diagram

(click to enlarge)

Publication: cxem.net

See other articles Section Measuring technology.

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