V7-21A V7-21A
4.9 63

Voltmeter universal V7-21A (V721A, V-7-21-A, V 7 21 A, b7-21a, V-721A, V 721A, b721a, b-7-21a, b 7 21a, b-721a, b 721a)

Designed for measurement of voltage and DC current, voltage and AC current, resistance. The voltmeter can be used to control and measure these parameters in the production of radio and electric components, with scientific and experimental studies during repair and maintenance work;
Dimensions - 290h200h142mm.

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Radiometric devices
voltmeters (V2-, V3-, V4-, V7-, V8-, V9-, F and others)
voltmeters V7
V7-21A voltmeter image.

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Product information updated 07 December 2024.

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Warranty:

12 months.

Warranty extension up to 5 years. 

Terms of delivery:

To all regions of the country, international delivery. 

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Product information updated 07 December 2024.

Found cheaper?

Let us know. Our price is the best. 

Warranty:

12 months.

Warranty extension up to 5 years. 

Terms of delivery:

To all regions of the country, international delivery. 

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Accessories, inexpensive analogues and other devices in stock(5)

Technical characteristics

Voltmeter universal V7-21A (V721A, V-7-21-A, V 7 21 A, b7-21a, V-721A, V 721A, b721a, b-7-21a, b 7 21a, b-721a, b 721a)

Voltmeter universal V7-21A purpose intended for measuring of voltage and DC current, voltage and alternating current resistance. The voltmeter can be used to control and measure these parameters in the production of radio and electric components, with scientific and experimental studies during repair and maintenance work.
In the voltmeter provides the ability to remotely manage and display information about the measurement result to the external tsifropechatayuschee unit (CPU).
Technical characteristics of the instrument voltmeter universal V7-21A:
Ambient temperature from 263K to 323K (from -10 º C to +50 ° C);
Relative humidity 98% at a temperature of 298K (25 º C);
Atmospheric pressure from 84kPa to 106kPa;
Measuring ranges of electrical quantities correspond to the values ​​indicated in Table. 1;
 
Table 1 Ranges of electrical quantities V7-21A
Name of measured values
Range of measurement
1. Direct current voltage
2. AC Voltage
3. DC Power
4. AC Power
5. The resistance of
6. The frequency range of the measured voltage AC
7. The frequency range of measurement of AC current
1 ∙ 10 -6 V-10 3
1 ∙ 10 -5 10 3
1 ∙ 10 -11 A-10A
1 ∙ 10 -8 A-10A
1 ∙ 10 -2 ohm-1, 2 ∙ July 10 Ohm
20Hz-1 ∙ May 10 Hz
20Hz-20 ∙ 10 3 Hz

Measurement ranges are divided into sub-bands according to the table. 2;
 
Table 2: Sub-bands measuring electrical quantities V7-21A
Designation of measured values
Ranges
Sub-band measurements
1. Direct current voltage
"= 10 mV"
"~ 100mV"
"~ 1B"
"~ 10V"
"AC 100V"
"~ 1000V"
1 in 10 -6 to 1 ∙ 10 -2 V
from January 10 -5 to 1 ∙ 10-1V
1 10 -4 V to 1V
1 10 -3 V to 10 V
1 10 -2 V to 1 ∙ 10 2
1 10 -1 V to 1 ∙ 10 3
2. AC Voltage
"~ 100mV"
"~ 1B"
"~ 10V"
"AC 100V"
"~ 1000V"
from January 10 -5 to 1 ∙ 10-1V
1 10 -4 V to 1V
1 10 -3 V to 10 V
1 10 -2 V to 1 ∙ 10 2
1 10 -1 V to 1 ∙ 10 3
3. DC Power
"= 100nA"
«= 1 uA"
"= 10uA"
"~ 100uA"
"~ 1mA"
"~ 10mA"
"~ 100mA"
"~ 1000mA"
"~ 10A"
1 10 -11 A to 1 ∙ 10 -7 A
1 10 -10 A to 1 ∙ 10 -6 A
1 10 -9 A to 1 ∙ 10 -5 A
1 A 10 -8 to 1 ∙ 10 -4 A
1 A 10 -7 to 1 ∙ 10 -3 A
1 A 10 -6 to 1 ∙ 10 -2 A
1 A 10 -5 to 1 ∙ 10 -1 A
1 10 -4 A to 1A
1 10 -3 A to 10A
4. AC Power
"~ 100uA"
"~ 1mA"
"~ 10mA"
"~ 100mA"
"~ 1000mA"
"~ 10A"
1 A 10 -8 to 1 ∙ 10 -4 A
1 A 10 -7 to 1 ∙ 10 -3 A
1 A 10 -6 to 1 ∙ 10 -2 A
1 A 10 -5 to 1 ∙ 10 -1 A
1 10 -4 A to 1A
1 10 -3 A to 10A
5. The resistance of
"100 ohm"
"1K"
"10k"
"100k"
"1 M"
"10M"
1 10 -2 ohm to 1 ∙ 10 2 ohms
1 10 -1 ohm to 1 ∙ 10 3 ohms
from 1 ohm to 1 ∙ 10 4 ohms
from 10 ohms to 1 ∙ 10 5 ohms
1 February 10 ohms to 1 ∙ 10 6 ohms
March 10 from 1 ohm to 1,2 ∙ July 10 Ohm
 
Voltmeter V7-21A provides automatic selection of the measuring range of voltage and DC current, resistance;
Determining the polarity of the voltage and DC current are carried out automatically;
Limits of relative basic error of measurement of DC voltage V7-21A:
on the limits of the "= 10mV," "~ 100mV"
δ = ± [0,06 +0,03 (| U to / U x | -1)];
at the limit "~ 1B"
δ = ± [0,04 +0,02 (| U to / U x | -1)];
where δ - the limits of permissible relative basic error in percent of the measured value; U to - the final value of the limit set of measurement; U's - the voltmeter;
Limits of relative basic error in the measurement of DC current B7-21A:
δ = ± [0,1 +0,04 (| I a / I x | -1)];
at the limit "~ 1mA"
δ = ± [0,03 +0,03 (| I to / I x | -1)];
where δ - Output accuracy as a percentage of the measured value;
I to - the final value of the limit set of measurement; I's - the voltmeter;
Limits of relative basic error in the measurement of AC voltage V7-21A:
at the limits "~ 100mV," "~ 1B" in the frequency range from 20Hz to 400Hz, and at the limit "~ 1B" in the frequency range from 10Hz to 50Hz
δ = ± [0,4 +0,05 (| U to / U x | -1)];
in the frequency range from 10 kHz to 50 kHz at the limit "~ 100mV"
δ = ± [0,4 +0,15 (| U to / U x | -1)];
in the frequency range from 400Hz to 10kHz
δ = ± [0,2 +0,05 (| U to / U x | -1)];
at the limits "~ 10V", "100V ~" "~ 1000 V" in the frequency range from 20Hz to 20kHz
δ = ± [0,4 +0,05 (| U to / U x | -1)];
at the limits "~ 100mV," "~ 1B" in the frequency range from 50kHz to 100kHz
δ = ± [1 +0,1 (| U a / U x | -1)];
Maximum permissible error of measurement of AC current B7-21A:
at the limits "~ 100uA," "~ 1mA" in the frequency range from 20Hz to 20kHz
δ = ± [0,4 +0,05 (| I a / I x | -1)];
at the limits "~ 10mA", "~ 100mA" in the frequency range from 20kHz 20Gtsdo
at the limit "~ 10A" at 50Hz
δ = ± [0,6 +0,05 (| I a / I x | -1)];
at the limit "~ 1000mA" in the frequency range from 50Hz to 1000Hz
δ = ± [0,4 +0,05 (| I a / I x | -1)];
where δ - the limits of permissible relative basic error in percent of the measured value; I to - the final value of the limit set of measurement; I's - the voltmeter reading;
When measuring voltage and AC voltmeter V7-21 is calibrated in rms values. The main error is provided in the measurement of voltage and AC current sine wave with harmonic content less than 0.2%, except for the limits "~ 100mA", "~ 1000mA" and "~ 10A" where the harmonic content of not more than 2%. Change voltmeter, caused distortion of the sinusoidal waveform of the measured values ​​do not exceed: half of the maximum permissible relative basic error THD as a percentage not exceeding the maximum permissible relative basic error THD as a percentage not exceeding:

1+0,09δ~-1/3·100,

where δ ~ - basic limits of permissible relative error of measurement of voltage or AC current;
Limits of relative basic error in the measurement of resistance of B7-21A:
δ = ± [0,1 +0,04 (| R a / R x | -1)];
at the limit "1K"
δ = ± [0,06 +0,02 (| R a / R x | -1)];
where δ - the limits of permissible relative basic error in percent of the measured value; R to - the final value of the limit set of measurement; R's - reading voltmeter;
Input impedance voltmeter V7-21A when measuring DC voltage of at least 1 G W to within the "= 10mV," "100mV ~" "~ 1B" and 10 MW ± 0,5 MW at the limits "~ 10V", "AC 100V" "~ 1000V".
Nutrition is a voltmeter AC 220V ± 22V and a frequency of 50 Hz ± 0,2 Hz and harmonic content up to 5%;
The power consumed by a voltmeter V7-21A from the network at the rated voltage does not exceed 14V ∙ A, with a maximum voltage - 18V max ∙ A;
Continuous operation voltmeter operating conditions for at least 16 hours followed by a break of at least 1 hour;
Voltmeter retains its specifications within the rules after the change in him, and a display unit for synchronization with external readjustment of adjustment;
Weight V7-21A - 5.3 kg;
Dimensions V7-21A - 290h200h142mm.
Rate the product: V7-21A
Number of views: 3579
Product rating: 4.8
Number of grades: 550
* rating and all product statistics are updated once a month; information is current as of 24 December 2024

Photos: V7-21A

V7-21A voltmeter image.

V7-21A voltmeter image.

V7-21A front view.

V7-21A front view.

V7-21A side view.

V7-21A side view.

V7-21A rear view.

V7-21A rear view.

V7-21A overhead view.

V7-21A overhead view.

V7-21A bottom view.

V7-21A bottom view.

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