Programmable DC Electronic Load 63600 Series Operation & Programming Manual
3-10
3.5.2 Constant Resistance Mode
Figure 3-13 Constant Resistance Mode
In CR mode, the Load will sink a current linearly proportional to the input voltage in
accordance with the programmed resistance. This mode is operated under the F/W
calculation. That is, take the measured V data, divide the resistance setting and get the I
setting value. There is a moving average calculation process for the measuring data. High
frequency parts will be removed, and the minimum transient time of the loading current in this
mode is 400us. To avoid the load current change caused by the input voltage variation, the
power source impedance should be as low as possible, and remote sensing cable must be
used to sense load input voltage when high sink current (low setting resistance) is
programmed.
Voltage Ranges (Low, Middle, High)
Resistance can be programmed in any of low, middle, or high range. The low range is used
for input voltage in low voltage range. The middle range is used for input voltage in middle
voltage range while the high range is for input voltage over middle voltage range. The current
range in CR mode is high range.
If input voltage is over the maximum of low range, you must select the middle range. When
input voltage is over the maximum of middle range, you must select the high range. To
change the range, press the
key few times until the LED range indicator is active at
you want to select. In some modules (single channel module) there are two resistance levels
(A or B) for CR function. Both A and B states use the same range. You can select state A or
state B through the
key on the module’s keypad. Slew rate determines the rate at
which load level changes from one load level state to another.
The standard option refrigerant line or the cable with line sense lower
than 0.5µH should be used between the UUT and Electronic Load.
When doing low voltage and large current testing, the load voltage
during loading needs to be larger than 1.8V to avoid loading error.
RANGE
A/B
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