EX355P - 175W, RS-232
Single output mixed-mode regulation, 0 to 35V at 0 to 5A Full remote control and readback using opto-isolated RS-232 interface Local operation via three rotary encoders Independent digital voltage and current meters Constant voltage or constant current operation DC output switch, automatic mode indication Compact lightweight design with low heat output
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Overview
The EX355P has been designed to meet the requirement for a low-cost dc power supply that can be remotely controlled using an RS-232 interface.
A simple remote interface is provided which can be used to set voltage and current levels and operate the output on/off.
Status monitoring enables actual current or actual voltage to be read back together with the operational mode (constant voltage or constant current).
The RS-232 interface is fully opto-isolated from the power supply output thus eliminating any restrictions on how the output is connected.
Front panel rotary encoders allow the units to operated as conventional bench power supplies. Front panel control can be locked out when using remote control.
The EX355P uses mixed mode regulation with a switch-mode pre-regulator followed by a linear post regulator. It can provide 175 watts and is an extension to the highly successful EX series of dc bench power supplies (see separate data).
EX series - full range
Single Output
Dual Output
Triple Output
SPECIFICATIONS
MAIN OUTPUTS
Operating Mode
Constant voltage or constant current with automatic cross-over and indication.
Voltage Setting
0V to >rated O/P by coarse and fine controls.
Current Setting
0A to >rated O/P by single logarithmic control.
Load regulation
<0.01% of max. O/P for a 90% load change.
Line regulation
<0.01% of max. O/P for a 10% line voltage change.
Output impedance
Typically <5mW in constant voltage mode. Typically >50kW in constant current mode.
Ripple & Noise (20MHz bandwidth)
Typically <2mV rms (CV mode).
Transient Response
<20祍 to within 50mV of set level for 90% load change.
Temp. Coefficient
Typically <100ppm/oC.
Output Protection
Outputs will withstand forward voltages above the rated output voltage. Reverse protection by diode clamp for currents up to 3A.
Status Indication
Output ON lamps. Constant current lamps.
Output Switch
Electronic. Preset voltage and current displayed when output is off.
Output Terminals
4mm terminals on 19mm (0.75") pitch .
METERS
Meter Types
Separate 4 digit meter for voltage & 3 digit meter for current with 14mm (0.56") LED displays. Reading rate 4/sec.
Meter Resolutions
10mV, 10mA.(100mV in CC mode)
Meter Accuracies
Voltage 0.3% ? digit. Current 0.6% ? digit.
REMOTE CONTROL
Interface
RS-232 interface, fully opto-isolated from power supply output. 9-pin D connector.
Baud Rate
Variable from 600 baud to 9,600 baud.
Remote Functions
Set Voltage, Set Current, Set Output On/Off, Read Voltage, Read Current, Read On/Off, Read Mode (CV or CC).
Setting Accuracy
Voltage 0.3% ?0mV. Current 0.6% ?0mA.
Setting Resolution
Voltage 10mV. Current 10mA.
Readback Accuracy
Voltage 0.3% ?00mV. Current 0.6% ?0 mA.
Readback Resolution
Voltage 100mV. Current 10mA.
COOLING
Convection cooling (silent operation).
POWER
AC Input
230V ?4% AC, 50/60Hz. (115V to order) Installation Category II. 300VA max.
SIZE AND WEIGHT
Size
140 x 320 x 160 mm (WxDxH)
Weight
3.0kg.
ENVIRONMENTAL
Operating Range
+5oC to +40oC, 20% to 80% RH.
Storage Range
-40oC to + 70oC.
Environmental
Indoor use at <2000m, Pollution Degree 1.
Safety
Complies with EN61010-1.
EMC
Complies with EN61326.
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