16
Fig. 2-5 Current-voltage Curve for Normal Power Supply
As adopting advanced slope detection method, Array 372x Series electronic load only need to test
a part of the current-voltage curve to know whether the two curves (constant power curve and
current-voltage curve) intersect. Therefore, when the set power is larger than the actual power, the
external power supply will not be short-circuited by the load for the insufficient power. When the load
detects that the power of the external power supply is insufficient, it will try to find constant power
point automatically till the set power is met.
2.3.4.1
Setting Ranges
The setting ranges for different models of load are listed as follows:
Model
3720A 3721A 3722A 3723A 3724A
Power 0~250W
0~400W
0~200W
0~350W
0~250W
2.3.4.2 Immediate Power Level
The immediate power level refers to the power set value in CP mode, which can be set via mode
selection and parameter setting menu, or via remote command (POWer <NRf+>). The immediate
resistance level can also be modified directly with left/right keys (
) and the knob.
2.3.4.3 Triggered Power Level
The triggered power level refers to the preset power value, which can become immediate power
level automatically when a trigger is received. If the CP mode and the input are enabled, the input will
be updated immediately when a trigger occurs. If the CP mode is not active, this power level will have
no effect on the input until the CP mode becomes active.
The triggered power level only can be set via remote command (POWer:TRIGgered
<NRf+>).Once a power level is triggered, subsequent triggers will become invalid until another
(POWer:TRIGgered <NRf+>) command is received. The trigger operaion 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”.
