Introduction to the main performance acceptance and measurement methods of DC regulated power supply-EEWORLD

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This power supply product is a universal DC output stable power supply . Its performance regulations and test methods comply with the following regulations. When the requirements exceed these regulations, they should be clearly stated in the contract.

    The main performance test precautions and test methods are as follows:

    I) Precautions:
1) When measuring, the value of the cumulative effect of all other influencing quantities should be kept less than 1/10 of the specified value of the measured effect.
2) The load is a variable influencing quantity. When the load is continuously adjustable, it should be measured at the minimum and maximum points (when the minimum value
is zero, it is specified to be measured at 10% of the maximum value).
3) A four-terminal line should be used to separate the current terminal and the measurement terminal to reduce measurement errors.
4) When the power supply provides measurement terminals , it should be performed on the measurement terminals, and the digital voltmeter test head should be inserted into the center hole of the terminal
to the bottom.
5) When measuring the steady-current power supply, a sampling resistor RM should be used so that the voltage drop on it is proportional to the current and should be less than 1/10 of
the error , and the error caused by it should be considered in the error analysis. At the same time, the sampling resistor RM should use a four-terminal line
to separate the current end and the measurement end to reduce the measurement error.
6) When the voltage or current stable output is continuously adjustable, it should be measured at the minimum and maximum points (when the minimum value
is zero, it is specified to be measured at 10% of the maximum value).

    II) Test method

    (I) Measurement of load effect and period and random offset.
1) The measurement of load effect is the measurement of the change in the voltage or current stable output caused only by the change in load.
2) The measurement of period and random offset is the measurement of the irregular fluctuation part (formerly known as ripple and noise) in the voltage or current stable output
. The measurement frequency range is: 10Hz~10MHz. A single grounding point must be used during measurement
to avoid measurement errors.
3) The measurement should be made within 1.5 seconds to 11.5 seconds after the load regulation is completed.
4) The measurement should be made when the source voltage is set to 198V, 220V, and 242V respectively.
5) Measurement method for regulated power supply:

Instrument connection method: According to Figure 1

b. Calculate the load effect ΔVle of the regulated power supply

　　　　　　　V i - V 1
　　ΔV le =------------- ×100%
　　　　　　　　V 1

ΔV le Load effect of regulated power supply
V 1 Output voltage value of the regulated power supply under test when the load current is the rated value
V i Output voltage value of the regulated power supply under test when the load current changes to zero or the minimum rated value
ＲＬ Load of regulated power supply
c. Read the period and random offset value V PARD from the effective value voltmeter or oscilloscope.

6) Measurement method for regulated current power supply:

a. Instrument connection method: According to Figure 2

b. Calculate the load effect ΔA le of the regulated current power supply
　　　　　 V i - V 1
ΔA le = ----------------- ÷ ＲＭ ×100%
　　　　　　V 1
ΔA le Load effect of the regulated current power supply
V1 Output voltage value Vi on the regulated current power supply RM under test when the load voltage is the maximum rated value Output
voltage value RM on the regulated current power supply RM under test when the load voltage changes to zero or the minimum rated value Sampling
resistor
C. Calculate the period and random offset value A PARD　
　　 A PARD = V 1PARD (or ViPARD) ÷ＲＭ　
A PARD Period and random offset value of the regulated current power
supply V1PARD Period and random offset voltage value on the regulated current power supply RM under test when the load voltage is the maximum rated value
ViPARD Period and random offset voltage value on the regulated current power supply RM under test when the load voltage changes to zero or the minimum rated value
7) When the load effect and the period and random offset measurements affect each other, they should be measured separately.

2) Measurement of source effect and periodic and random offset.
1) The measurement of source effect is the measurement of the change in the stable output voltage or current caused only by the change in the source voltage.
2) The source effect should be measured within a time interval of 1.5 seconds to 11.5 seconds after the source voltage adjustment is completed.
3) The source voltage is a variable influencing quantity and should be measured at 220V to 198V, 198V to 220V, 220V to 242V, and 242V to 220V respectively.
4) Measurement method for regulated power supply:
a. Instrument connection method: according to Figure 1
b. Calculate the source effect ΔVse of the regulated source
　　　　　Vi - V1
ΔVse = ------------ ×100%
　　　　　　V1

ΔVse Regulated power supply source effect
V1 The output voltage of the regulated power supply under test when the source voltage is 220V and the load is at the maximum and minimum values, respectively.
Vi The output voltage of the regulated power supply under test when the source voltage is 198V and 242V and the load is at the maximum and minimum values, respectively.
ＲＬ Regulated power supply load

c. Read the period and random offset value VPARD from an effective value voltmeter or oscilloscope.
5) Measurement method for steady-state power supply:
a. Instrument connection method: see Figure 2
b. Calculate the source effect ΔA se of the steady-state power supply
　　　　　Vi - V1　
ΔA se =------------÷ ＲＭ ×100%
　　　　　　V1
ΔA se Source effect of steady-state power supply
V1 The source voltage is 220V, and the output voltage value of the steady-
state power supply RM under test when the load is at the maximum and minimum values respectively Vi The source voltage is 198V and 242V, and the output voltage value of the steady-state power supply RM under test when the load is at the maximum and minimum values respectively
c. Calculate the period and random offset value A PARD
A PARD = V1 PARD (or Vi iPARD) ÷ ＲＭ A PARD Period and random offset value V 1PARD The source voltage is 220V, and the load is at the maximum and minimum values respectively Vi iPARD The source voltage is 198V and 242V, and the load is at the maximum and minimum values respectively

6) When the source effect and the measurement of period and random offset affect each other, they should be measured separately.

(III) Drift measurement
1) Drift measurement is
the measurement of the slow and continuous maximum change of the voltage or current stable output within a specified time after the power supply is preheated and stabilized (thermal equilibrium). The drift measurement includes output disturbance, and the frequency range is from DC to 20HZ.
2) Drift should be measured under reference conditions.
3) Load range: There are two methods.
a. Measure when the load is added to the rated maximum value.
b. Measure when the power supply is working at no load (or minimum value).
4) The test instrument should have sufficient frequency response to the frequency disturbance from DC to 20Hz. Signals exceeding 20Hz should be filtered out by a low-pass filter, and its out-of-band (greater than 20Hz) suppression should not be less than 6dB per octave.
5) In order to ensure the accuracy of the measurement, all monitoring should be placed under constant temperature conditions if necessary. Ensure that the error limit introduced by the absolute value of the combined effect of all observation instruments and influencing quantities (especially temperature) should not exceed 1/10 of the specified value of the power supply drift.
6) Measurement method when the power supply is stabilized:
a. Instrument connection method: According to Figure 3

b. Calculate the drift value of the regulated power supply
ΔVd=Vmax-Vmin
ΔVd The drift value of the regulated power
supply Vmax The maximum output voltage of the regulated power supply under test within a specified time
Vmin The minimum output voltage of the regulated power supply under test within a specified time

7) Measurement method for steady current power supply:
Instrument connection method: according to Figure 4

b. Calculate the drift value of the regulated current source
ΔAd= |V max /Rm|-|V min /Rm|
ΔAd The drift value of the regulated current source
V max The maximum output voltage on the regulated current source RM within the specified time
V min The minimum output voltage on the regulated current source RM within the specified time
I) Measurement regulations and precautions
1) When the error of the measuring instrument cannot be ignored, the following principles should be adopted. The purpose is to prevent the manufacturer from
delivering instruments that are out of tolerance and the user from rejecting instruments that are within the tolerance.

　　 If the given allowable error for a given performance characteristic is ±e, and the error of the corresponding test method is ±n, then: the manufacturer's error limit should be ±(en), and the user's error limit should be ±(e+n).
2) When measuring the period and random drift, the frequency range is 20Hz-10 MHz. When the given value is an effective value (rms), an effective value digital voltmeter or oscilloscope of this frequency range should be used.
3) When measuring drift, the frequency range is 0-20 Hz, and the signal exceeding 20 Hz should be filtered out by a low-pass filter.
4) The preheating time of the power supply under test is specified to be 30 minutes. After 30 minutes, the influence quantity is changed, and the drift measurement can only be carried out after the power supply under test itself reaches thermal equilibrium.

Reference address：Introduction to the main performance acceptance and measurement methods of DC regulated power supply

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