VAM 7520P Adjustable Voltmeter Ammeter 75V 20A Voltage Current Power Multi-function Meter
  • VAM 7520P Adjustable Voltmeter Ammeter 75V 20A Voltage Current Power Multi-function Meter
  • VAM 7520P Adjustable Voltmeter Ammeter 75V 20A Voltage Current Power Multi-function Meter

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VAM 7520P Adjustable Voltmeter Ammeter 75V 20A Voltage Current Power Multi-function Meter

Technical indicators:
- An input voltage range (2-wire): 5V ~ 40V (4020)
                                            8V ~ 40V (4020,4010 P, 4020P)
                                            10V ~ 75V (7510P, 7520P)
                                            10V ~ 90V (9020)
- Input voltage range (3-wire supply voltage recommended to use 12V or 24V):
                                             0 ~ 75V (4010P, 4020P, 7510P, 7520P)
                                             0 ~ 90V (4020,9020)

(2) Output current range: 0 ~ 10A (4010P, 7510P)
                                             0 ~ 20A (4020,9020,4020 P, 7520P)
(3) the voltage and current display: four LED, 3 digits + a display unit
Display Resolution: 0.01V, 0.01A, 0.01W, 0.01AH 0.01H
(5) voltage accuracy: ± 1% +2 word

6. Current accuracy: ± 2% +5 word
Measurement rate: 5 times / sec
Type of protection: OCP, with OAH, OVP, OPP and the OFT, LOP,
Protection setting range: over-current protection the OCP: 0.01 ~ upper limit
                              Overcharge capacity to protect the OAH: 0.01AH ~ 999AH
                              Overvoltage protection the OVP: 0.01V to 99.9V
                              Undervoltage protection LOP: 0.01V ~ 99.9V
                              Over Power Protection OPP: 0.01W ~ 9999W
                              Time-out to protect the OFT: 0.01 hours to 99.9 hours
- 10 Dimensions (mm): 79 (L) * 43 (W) * 25 (D)
- 11 mounting hole to hole (mm): 76.5 * 39.2
- Third, the instrument structure:

use:
- 1, The function of this instrument is practical, easy to use, the next in front of four basic use, 6 is the introduction of the debug mode.
A correct connection input and output lines, note that the wiring can not reverse
- 2 Make sure the input voltage in the instrument can withstand the voltage range, power, above the digital pipe default default display voltage values ​​below digital tube display the current value (with a shutdown of the following default display is-OFF, indicates the default off).
- 3 models without shutdown, the signal voltage and current directly display model with shutdown, the default is off, if yes, confirm that this voltage <OUT> button you can press the output voltage, this when the input voltage will be added to the load.
- Press the up button to select the above digital tube display items, press the down button to select the following digital tube display program, very flexible and convenient to use.
- (5) of the following circumstances, you can enter the debug mode to set:
- Native boot is off by default, if enabled by default set to boot.
Need to enable over-voltage protection (OVP), undervoltage protection (LoP), over-current protection (OCP), Over Power Protection (OPP), over-charge capacity to protect (OAH), time-out protection (OFT) and other specific values.
Have a certain error in the measurement of voltage or current value needs to be calibrated.
When you tune the chaotic voltage and current parameters, need to restore to factory settings.
Entering the debug mode, the boot state, long press <OUT> button above the digital display 0-U, said it has entered debug mode, then shorter by <OUT> button above digital tube display setting content varied between 0-10, the need to set different functions, the following will elaborate on these features:

-   0-U is the voltage measurement calibration, the digital display below the current values ​​of the measured voltage, as long as we calibrate the high low-end 2-point voltage, high voltage points in general can take 30V low-voltage point of 10V, the highs and lows of the boundaries of standard 20V, calibration high point voltage, below 20V that the calibration of low voltage, can be compared with a standard voltmeter, press the up can be higher than 20V increase the value of voltage measurement, press the down can reduce the voltage measured values, two points can sometimes influence each other, and 2-3 times back and forth to adjust, we can guarantee accurate.
1-C is the calibration of the current measurement value, the digital display below the current values ​​of the measuring current, the same as long as we calibration of high and low end of the current value of two points on it, and a high current point can generally be taken 3A low current points can take 0.1A, high and low points of the boundaries of standard 2A, higher than 2A that the current in the calibration of high point, less than 2A that the calibration of low current, can be compared with standard current meter, press the Up to increase the current measurement value, press the down can reduce the current measured values, two points can sometimes influence each other, and after 2-3 times back and forth to adjust, we can guarantee accurate.
If you adjust after the need to save the parameters can be adjusted to the "2-ES", "-n-" At this point the following digital display, said they did not save the parameters, you can press down to display "-y- , then the press <OUT> will automatically exit from debug mode at the same time to save the parameters.
3-r "is fully restored to factory settings, this function is mainly users to tune the chaotic voltage and current values, want to return to the initial value, press down to the"-y-, and then press <OUT>, you can restore the factory settings.
The following set for the model with P:

- 4-ON "is set to boot is turned on, the default display is the" n-", that is not open, press the up or down to display the"-y-, and then introduced in accordance with the above 3) can save the parameters.
 5-OV "to" 10-L expressed in different protection settings, the default is 0, that is not open, set non-zero parameters of the function is enabled, press up to increase the setting value, press down to lower settings, press and quickly adjusted, a good tune, the same save the parameters can be described in accordance with the above 3).
The following is a feature comparison table for each location:

(6) for the use of a variety of protection, the following further detail description is as follows:

If you set the OCP value of 1.00A, when the output current of more than 1A, the unit will automatically cut off the output, while the screen displays the type of protection for the OCP, press any key to return to normalcy.
If OAH value 4.00AH, then the output of electricity than 4AH, the unit will automatically cut off the output, while the screen displays the type of protection with OAH, require special attention, the power value is an accumulated value, more than once, it can not output point, you can long press the down button to clear power value and time value can be re-output.
If you set the OVP value is 10.0V, the output voltage exceeds 10V, the unit will automatically cut off output while alarm.
If you set the the LoP value of 10.0V, the output voltage is below 10V, the unit will automatically cut off the output, while the alarm, this feature is more suitable for the instrument as a battery discharge device, the specific operations, see the following special case.
If you set OPP value 15.0W, output power greater than 15W, the unit will automatically cut off the output at the same time the alarm.
If OFT value 1.00H, the output time of more than 1 hours, the machine will automatically cut off the output, while the police, need to re-output, press and cleared the timer.
If the machine protection settings, and now want to immediately return to the default is not enabled (0 state), in normal mode, long press the up button you can.

Fourth, the typical application example:

DC-DC power module types on the market very much, adjust some large are using the 3296 trimmer potentiometer, when used with a multimeter to monitor voltage, sometimes even swap the multimeter gear monitoring output current change is not convenient enough. Power class product design, the instrument can display the output voltage and output current, but also has many advantageous features.
The application of this instrument to control the charging of the more common of the instrument to precisely control the charge into the battery power, such as the battery is to 6AH the capacity, but did not run out of power, then you can set the OAH value 4AH begin charging 4AH, the instrument can automatically cut off the output, thereby protecting the rechargeable battery.
Use of this instrument can be more accurate detection of the battery capacity is used as a discharge instrument, such as your 12V battery, you can set the minimum discharge up to the voltage (LoP) 10.8V, then a high-power resistor in the output termination resistance the smaller the greater the current, the shorter the time of the corresponding discharge at the discharge end, you can see that the how much power is put. Should be noted that this application is best to use three-wire to instrument a separate power supply, so it can be more accurate, because the 2-wire instrument itself, power consumption is not included in the cumulative power inside.
V. Notes:

Not exceed the instrument voltage and current range use, otherwise it will damage the instrument
Positive and negative can not be wrong, can not correctly measure reversed

What's include?
 - 1 x VAM 7520P  Adjustable Voltmeter Ammeter 75V 20A

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