Atec Chroma-63200 Series - Manual (Page 2)

and therefore can test if the battery charger has correct charging current corresponding to its own out-
put, or more precisely, the battery voltage. If the UUT is battery, the electronic load is able to simulate the behavior of the device that uses the
battery. For most of the electronic and electrical devices, their power consumption patterns are more likely constant power devices.
Consequently, CP mode simulation will be essential for a battery discharge load.
2. LOW VOLTAGE OPERATING CHARACTERISTICS
For high power load, its high loading current may cause dramatic line
drop between UUT and load terminal due to the line impedance of
cabling. So, the lower operating voltage allows the 63200 series
loads to draw sufficient current from a low volt output power supply
directly.
Meanwhile, 63200 series loads use current close loop design, and
connect all power MOSFET devices in parallel to insure high accura-
cy load control with minimum drift less than 0.15% of the current set-
ting. The MOSFET technology accomplishes the input impedance to
a minimum that enables the load to draw very high current even at
very low voltage. For example, model 63209 is capable of drawing
1000A at only 1V input.
3. MEASUREMENTS
Chroma 63200 series are built in the15-bits precision A/D converter, thus can achieve 0.05%F.S., 0.1%F.S. and 0.3%F.S. accuracy for voltage,
current and power measurement respectively. And they can be shown simultaneously on three big LED displays for user's convenience. In
additional to standard measurements, they also provide voltage and current monitor outputs, which are useful when user needs to monitor the
voltage and current waveform via scope.
4. DYNAMIC LOADING AND CONTROL
Modern electronic devices operate at very high speed, thus,it is
important for an electronic load to perform well in the transient
and dynamic response of power devices. To satisfy these test-
ing applications, the 63200 loads offer high speed, programma-
ble dynamic load simulation and control capability ever
achieved before. The figure below shows the programmable
parameters of the 63200 load modules. The programmable slew rate makes the simulation of transient load change demanded by the require-
ment of real life application possible. The internal waveform generator of 63200 is capable of producing maximum slew rate at 25A/uS (63208),
and dynamic cycling up to 20KHz. Its dedicated remote load senses and controls circuit guarantee the minimum waveform distortion during
continuous load changes.
5. MASTER / SLAVE PARALLEL CONTROL
When higher power is required,it is common to parallel two elec-
tronic loads together to draw higher current. 63200 series high
power loads have smart Master / Slave control mode. When the
loads are set to Master / Slave mode, users can program the load-
ing (CC mode only) on master unit. The loading current values of
the slave units will be calculated and downloaded by master unit automatically. In short, unlike the traditional design, users may consider several
load units that work under Master / Slave mode as a single load unit. It simplifies the user operation dramatically.
6. EXTERNAL LOADING WAVEFORM
SIMULATION
The 63200 series electronic loads can be con-
trolled by external analog control signal, which is
generated by any kind of signals or arbitrary
waveform generator. Thus, it is capable of simu-
lating any loading waveforms observed in the field.
The CC and CR mode loading simula-
tion is helpful to test whether the output
voltage of the UUT remains stable or
regulated under different loading cur-
rent or resistance conditions. For bat-
tery chargers, CV mode may help to
change the output voltage of a charger
1. APPLICATION SPECIFIC LOAD SIMULATION
Chroma electronic loads 63200 series provide constant current, constant resistance, constant voltage and constant power modes for various
application requirements.
V
I
V
I
V
I
V
I
Constant current Constant resistance Constant voltage Constant power
T1 T2
Load 1
Load 2
Fall rate Rise rate
XZHGCZCKVKCKVCXXMLXMCKMKC XK CV GH VB CV VB
CX
CX
CX
CX
CX
XCXVCVV XCXVCVV
XCXK
VCVV/
HJJ
XCXVCVV
CVC XD
ZXZCXZVCX
C545
VB56566NM GH2333
32233 115666
XCL,;LB,N;.B’MBNCLV LLXCLMLVMKCMBBV
Model 63209(15600W) input characteristics