This series includes two-way and three-way DC regulated power supply. Three-way have high
accuracy output, of which two way are adjustable and one way is fixed. The two adjustable outputs
can be selected for constant voltage (C.V.) or constant current (C.C.), designed in high stability and
performance circuit. In constant voltage operation mode, the output voltage can be arbitrarily adjusted
from 0V on to the nominal range. In constant current operation mode, the output current can be
adjusted from 0A on in the nominal range. The two outputs can be connected in parallel or in series,
while the master adjust controls the voltage and current setting. The fixed output voltage is 5V. This
output features good stability and low ripple along with overload (e.g. short circuit) protection. The unit
features small size and excellent performance combined with an elegant design, being ideal for
research, university, industry and appliance maintenance laboratories.
1. TECHNICAL SPECIFICATION
1.1 Model:
QJ3003EIII, QJ3005EIII
1.1.1 Input voltage:
220VAC 50Hz
1.2 Two adjustable outputs
1.2.1 Output voltage:
0-30V (adjustable continuously)
1.2.2 Output current:
0-3A (0-5A) (adjustable continuously)
1.2.3 Source regulation:
CV
≤0.01%+3mV
CC≤0.01%+6mA
1.2.4 Load regulation:
CV≤0.01%+2mV (rated≤5A)
CV≤0.01%+5mV (rated> 5A)
CC≤0.01%+6mA
1.2.5 Ripple and noise:
CV≤1mV (rms)
CV≤20mVp-p
CC≤3mA (rms)
CC≤50mAp-p
1.2.6 Protection:
current-limiting protection
1.2.7 Indication:
Voltmeter & Ammeter
or 3-digit volt-LED & Amp- LED
a. Volt-indication:
LED ±1%±2digits
b. Amp-indication:
LED ±2%±2digits
1.3 Fixed output:
1.3.1 Output voltage:
5V±3%
1.3.2 Output current:
3A
1.3.3 Source regulation:
≤1×10
-4
+1mV
1.3.4 Load regulation:
≤1×10
-3
1.3.5 Ripple & noise:
≤0.5mV(rms)
≤10mVp-p
1.3.6 Protection:
current-limiting & short-circuit protection
1.4 Operating ambient
1.4.1 Operating temperature:
0 to +40ºC
