Wholesale Good quality Usb Load Tester - ET37 Series Programmable DC Power Supply – Zhongchuang Supplier and Factory

Good quality Usb Load Tester - ET37 Series Programmable DC Power Supply – Zhongchuang

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Good quality Usb Load Tester - ET37 Series Programmable DC Power Supply – Zhongchuang Detail:

User-friendly design:

¤ Using 4.3 inch TFT LCD, the resolution is 480*272.

¤ Support waveform display, real-time display of channel output voltage and current curve.

¤ Operating system is simple and convenient, with intuitive interface display system, easy to use.

High performance output:

¤ Independent adjustable output: 1 (ET372X)/2 (ET373X) adjustable output 30V/3A (30V/5A), 1 (2.5V/3.3V/5V)

adjustable fixed output; maximum total output power can reach 305W.

¤ Four output modes: vertical/positive/negative/parallel/series, providing a wider output range. The maximum output

voltage can reach 60V, and the maximum output current can reach 10A.

¤ High precision and high resolution.

¤ Low output ripple and noise.

¤ It has excellent load regulation rate and linear regulation rate.

¤ Support timing output function, maximum set 112 groups.

¤ It has the function of storage and invocation, and can save up to 10 sets of parameter settings.

¤ Standardized USB Device interface, RS232 interface, support SCPI remote command control.

Multiple security protection:

¤ With over-voltage/over-current protection function, it can flexibly set over-voltage and over-current parameters to

achieve effective load protection.

¤ It has two-level over-temperature protection function, realizing double over-temperature protection of software and

hardware.

¤ It has the function of intelligent fan speed control, adjusts the fan speed according to the working conditions, and

effectively reduces the fan noise.

¤ Connecting and Counter-protection with Output Polarity.

¤ It has key lock function to prevent misoperation.

¤ Power voltage: 220V.AC±10%, 110V.AC±10%, 45~65Hz

¤ Display: 4.3” TFT LCD, with a resolution of 480×272, and 16 M colors

¤ Operating temperature: 0°C-40°C

¤ Storage temperature: -10°C-70°C

¤ Relative humidity: ＜80%

¤ Interface: USB DEVICE, RS232 (optional)

¤ Sizes: 230mm x 380mm x 150mm (WxDxH)

¤ Weight: 11kg

¤ Three core power cord: 1

¤ User manual: 1

¤ Output line: 1

¤ USB data line: 1

¤ RS232 data line: 1

Model			ET3721 ET3728	ET3722 ET3729	ET3731 ET3738	ET3732 ET3739
Maximum power			105W( ET3721、3722) 155W(ET3728、3729)		195W(ET3721、3722) 305W(ET3728、3729)
Channel number			2 (CH1 variable, CH2 fixed)		3 (CH1, CH2 variable, CH3 fixed)
DC output (0°C-40°C)	Voltage/current (Rated value)		CH1：0~30V，0~3A(ET3721、3722) CH1：0~30V，0~5A（ET3728、3729）		CH1、CH2：0~30V，0~3A(ET3721、3722) CH1、CH2：0~30V,0~5A(ET3728、3729)
	Over-voltage/over-current protection		CH1：10mV~33V，10mA~3.3A CH1：10mV~33V,10mA~5.5A		CH1、CH2：10mV~33V，10mA~3.3A CH1、CH2：10mV~33V，10mA~5.5A
	2.5V/3.3V/5V Fixed output		Current output 0~3A(ET3721、3722、3731、3732)，Or 0~1A（ET3728、3729、3738、3739）;Output precision: ＜5%;Load regulation: ≤15minimum scale interval; Linear regulation: ≤5minimum scale interval; Ripple and noise (20Hz~7MHz): ≤2mVrms; Overload: 3A(ET3721、3722、3731、3732)，or 0~1A（ET3728、3729、3738、3739）; (Parameters of the fixed position are all listed. The parameters below apply to the variable positions of the voltage.)
Linear regulation rate (±output percentage + quantity of minimum scale interval(s))
Voltage			≤0.01%+2	≤0.005%+2	≤0.01%+2	≤0.005%+2
Current			≤0.01%+3	≤0.005%+3	≤0.01%+3	≤0.005%+3
Load regulation rate (±output percentage + quantity of minimum scale interval(s))
Voltage			≤0.01%+2	≤0.006%+2	≤0.01%+2	≤0.006%+2
Current			≤0.005%+3	≤0.01%+3	≤0.05%+3	≤0.01%+3
Tracking operation (±output percentage + quantity of minimum scale interval(s))
Tracking error			/		≤0.5%+10 of Master（no-load）
Parallel regulation rate		Linear	/		≤0.01%+5
		Load	/		≤0.01%+5
Series regulation rate		Linear	/		≤0.01%+10
		Load	/		≤0.02%+10
Ripple and noise (20Hz~-7MHz)
Voltage			≤1mVrms	≤600μVrms	≤1mVrms	≤600μVrms
Current			≤1.5mArms	≤1mArms	≤1.5mArms	≤1mArms
Programming/backward reading resolution
Voltage			1mV	1mV	1mV	1mV
Current			1mA	1mA	1mA	1mA
Programming/backward reading accuracy (±output percentage + quantity of minimum scale interval(s))
Programming		Voltage	0.03%+10	0.02%+5	0.03%+10	0.02%+5
		Current	0.3%+10	0.3%+5	0.3%+10	0.3%+5
Backward reading		Voltage	0.03% +10	0.03% +5	0.03% +10	0.03% +5
		Current	0.3% +10	0.2% +5	0.3% +10	0.2% +5
Load transient response time
It takes less than 50μs for the output current to change from full load to half load, or from half load to full load and for the output voltage to recover to 15mV.
Stability (±output percentage + quantity of minimum scale interval(s))
Voltage			≤0.02%+10		≤0.02%+10
Current			≤0.1%+1		≤0.1%+1
Temperature coefficient (±output percentage + quantity of minimum scale interval(s))
Voltage			≤0.02%+10		≤0.02%+10
Current			≤0.02%+10		≤0.02%+10
Other
Command processing time			＜200ms
Cooling method			Fan cooling