15
level will have no effect on the input until the CR mode becomes active.
The triggered resistance level only can be set via remote command (RESistance:TRIGgered
<NRf+>). Once a resistance level is triggered, subsequent triggers will become invalid until another
(RESistance:TRIGgered <NRf+>) command is received. The trigger operation will be described in
later chapter. The status register of the electronic load can keep track of pending triggers and other
operating conditions, which will be described in details in the “ARRAY 372x Series Electronic Load
SCPI Programming Guide”.
2.3.3.4 Transient Resistance Level
The load will switch between the transient high resistance level (LevelH) and transient low
resistance level (LevelL) when the transient operation is enabled. The transient resistance level can be
set in transient operation menu from the front panel, or via remote command
(RESistance:HIGH<NRf+>, RESistance:LOW <NRf+>).
2.3.4
Constant Power Mode (CP)
There are two sorts of constant power modes, the Constant Power-Voltage Source mode (CPV)
and the Constant Power-Current Source mode (CPC). The CPV mode is applied to voltage source test,
and the CPC mode is applied to current source test. In CP mode, the load consumes the constant power
in accordance with the programmed value
regardless of the changes of external current and voltage
(see Fig.2-4). Press
key to enter into mode selection and parameter setting menu. Choose CPV
or CPC mode with
and
keys. Input the power value via Entry keys or the knob with
and
keys. Use
key for confirmation. The CP mode and parameters can also be set via
remote command (MODE CPV, MODE CPC, POWer <NRf+>).
Fig.2-4 CP Mode
Figure 2~5 are the current-voltage curves for several common power supplies. The constant
power curve is a hyperbola in the first quadrant. The constant power curve usually intersects with
current-voltage curve at two points (the CPV point and the CPC point) when the power of the external
power supply is larger than the set power. At the CPV point, the power supply shows the feature of
voltage source: the output power will be increased with increasing current; at the CPC point, the power
supply shows the feature of current source: the output power will be increased with increasing voltage.
Array 372x series electronic load can be set at any one of intersection points to operate by the user.
