YIHUA 303D DC Power Supply
Feature
303D communication maintenance power supply is a single line output of stabilized high accuracy
DC stabilized power supply. The output voltage and current can be adjusted continuously within the
rated range. The load current has MA conversion with two settings: 0-3A and 0-99 mA. Constant
voltage and constant current (CV/CC), automatic switching of working modes. Double digital display
shows output voltage and current independently. Several protection functions include current
limitation, voltage reduction, short circuit protection, over-temperature protection, etc. The design
is applied to production line of the plant, maintenance, laboratories and is also a necessary device
for the communication industry.
₨7,586 ₨10,529
Principle description of constant voltage/constant current CV/CC
The operation mode of constant voltage/constant current can be automatically switched depending
on the comparison result of the load current and limited current value.
- a) Constant voltage CV
When the existing current value is smaller than the set output limit current value, the power supply
is working under the constant voltage mode. The CV indicator light on the front panel is on, the
output voltage is controlled and it will be the same as the set value. Current changes with the load.
- b) Constant current mode (CC)
When the current value exceeds the limit value of the output current, the equipment will work in
the CC mode. The CC indicator light on the front panel is on, the output current value is controlled
to the set value. Since the limited output power cannot be overloaded, the output voltage can be
lower than the set value. When the output current is lower than the set value, the equipment will
automatically change to CC mode.
| Weight | 4 kg |
|---|---|
| Dimensions | 25 × 13 × 15 cm |
Machine parameters
| Parameters | |
| rated voltage | AC220V 50Hz |
| Power of complete machine | 140W |
| Operating environment | 0～40℃ relative humidity ＜80％ |
| Storage Temperature | －20～80℃ relative humidity ＜80％ |
| Dimensions of the machine body | 255*130*150mm |
| weight | 4.3KG |
| Performance parameters | |
| output voltage | Adjustable continuously within 0～30V |
| output current | Adjustable continuously within 0～3A/0-99mA
(current limitation adjustment when above 0.2A) |
| output power | 90W |
| Source effect | 1mV |
| load effect | ≤0.33% |
| Ripple noise | ≤3mVrms（5Hz ~ 1MHz）/≤3mArms |
| Display accuracy | 0.1V/0.1A/1mA |
| Protection mode | Over current, short circuit, over temperature protection |
| Dissipation mode | air cooling |
Brand
YIHUA
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Clamp Meters
Digital Clamp Meter UT202+ UNI-T
Specifications Range UT202+ AC current (A) 400A ±(2%+10) 600A AC current frequency (Hz) 50Hz~100Hz ±(1%+5) AC voltage (V) 600V ±(0.8%+5) AC voltage frequency(Hz) 10Hz~10kHz ±(1%+5) 10Hz~60kHz Resistance (Ω) 40MΩ ±(0.8%+2) 60MΩ Capacitance (F) 4mF ±(4%+5) 40mF 60mF Temperature (℃) -40℃~1000℃ ±(1.5%+5) Frequency (Hz) 10Hz~10MHz Features Display count 4000 Auto range √ Jaw opening 28mm True RMS √ NCV √ Live wire test Continuity test √ Diode √ MAX/MIN √ Relative mode √ Zero mode Data hold √ Low battery indication √ Auto power off √ General Characterisitics Power 1.5V battery (R03) x 2 Display 37mm x 25mm Product color Red and grey Product net weight 248g Product size 215mm x 63mm x 36mm Standard accessories Batteries, test leads, Themocouple Standard individual packing Gift box, Carring bag, English manual Standard quantity per carton 40pcs Standard carton measurement 485mm x 295mm x 385mm Standard carton gross weight 17.8kg SKU: n/a -
Earth Ground Resistance Testers
MRU-30 Earth Resistance and Resistivity Meter
-
It allows to take the measurements of:
- earthing resistance using auxiliary electrodes,
- earthing resistance using auxiliary electrodes and clamp (for measurements of multiple earthing),
- earthing resistance using double clamps for measuring multiple earthing without underground connections.
- ground resistivity (Wenner method),
- continuity of equipotential bondings and protective
- conductors (meeting the requirements IEC 60364) with auto-zero function – with current 200mA.
Additionally:
- measurement of resistance of auxiliary electrodes RS and RH,
- measurement of interference voltage,
- measurement in the presence of interference voltage in the power network
- with frequency 50Hz, 60Hz,
- selection of maximum measuring voltage (25V and 50V),
- introducing the distance between the electrodes for the resistivity in metres (m) and feet (ft),
- memory of 990 measurements (10 banks of 99 cells each),
- calibration of clamp used,
- data transmission to the computer (USB),
- indication of battery state.
SKU: n/a -
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