Operation Overview
3.5.2 Constant Resistance Mode
Figure 3-6 Constant Resistance Mode
In CR mode, the Load will sink a current linearly proportional to the input voltage in
accordance with the programmed resistance. There is a double pole RC filter of input
voltage, so the high frequency parts will be removed. The time constant of low pass filter is
about 47 μS. The load sink current of CR mode is proportioned to the input voltage through
a double pole RC filter. 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, High)
Resistance can be programmed in either of low or high range. The low range is used for
input voltage in low voltage range while the high range is for input voltage over low voltage
range. The current range in CR mode is high range.
MODE SELECT
CRL Select Constant Resistance low voltage range.
MODE SELECT
CRH Select Constant Resistance high voltage range.
Press ENTER to select the range.
If input voltage is over the maximum of low range, you must select the high range. Press
MODE key, and then use ▲ or ▼ key to select the voltage range. 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 A (CRL1 or CRH1) or B (CRL2 or CRH2)
3-7
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