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Operation Overview
3.5.5 Constant Impedance Mode
Figure 3-16 Constant Impedance Mode
In CZ mode, the Load will sink a current according to the programmed impedance. This
mode is operated under the F/W calculation. That is, take the measured V data, divide the
Impedance setting and get 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.
Impedance can be programmed by set the equivalent series resistance Rs, equivalent series
inductance Ls, equivalent parallel load capacitance C
, equivalent parallel load resistance R
L
L
and Ip (max) parameters for loading when operating in this mode. The UUT Ip (max) value
needs to be set before loading and the parameter range for setting is listed in the
specifications.
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.
3.6 Load ALL RUN
Chroma 63600-5 multiple electronic load mainframes can have at most up to ten channels.
The method each channel loads On/Off can be controlled by the ALL RUN setting. The
loading of channels with the ALL RUN function turned on, can be controlled via other
channels with ALL RUN settings turned on. Channels with ALL RUN turned off will load
On/Off individually.
3.7 Measurements
Each module measures current and voltage of a UUT. The sampling rate is about 2μs.
Voltage and current measurements are performed with a 16-bit resolution of full scale ratings.
3-13
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