AMETEK SLH Series RevC - Manual (Page 39)

Sorensen SLH-Series DC High Power Electronic Load Operation
Constant Resistance Mode:
Range 1 indicates low load resistance operating range (high resistance, low current),
Range 2 indicates high load resistance operating range (low resistance, high
current). The detailed resistance range specifications are shown in Table 1-1. The
resistance range changes automatically in accordance to the programmed load
resistance.
The SLH-series electronic load will set Range 1 automatically if the programmed
load resistance is higher than the minimum load resistance of Range 1, and will set
to Range 2 when the programmed load resistance is lower than the minimum load
resistance of Range 1.
The normal operating mode for programming values is for the load to automatically
select low or high range (CC or CR modes only). However, in the use of the analog
input, the load can be programmed in Range 2 at all times.
Over Current Test (OCP Test):
An OCP test automatically steps the current from a start current (iStAr) to a stop current (iStOP) in
equal increments (iStEP). When the voltage falls below a threshold voltage (Uth), the test stops and
the current setting is saved.
Each press of the LIMIT key steps through settings for the three setup parameters. The threshold
voltage setting appears after the OPP test parameters.
After setting the four parameters, set the OCP test mode, store and run the test.
Over Power Test (OPP Test):
An OPP test automatically steps the current from a start power (PStAr) to stop power (PStOP) in
equal increments (PStEP). When the voltage falls below a threshold voltage (Vth), the test stops and
the power setting is saved
Each press of the LIMIT key steps through settings for the four setup parameters.
After setting the four parameters, set the OPP test mode, store and run the test.
Test Mode:
Test modes are Normal, OCP and OPP. All modes except OCP and OPP are “normal” mode.
Press the LIMIT key until tESt appears on the display. Use the inc/dec arrows to set Normal, OCP or
OPP modes.
If OCP or OPP mode is selected, store the setting in the chassis memory as described in the SLH-4
or SLH-1 programming manual.
To run an OCP or OPP test, recall the memory location where the test was saved.
To return to Normal mode, press the LIMIT key until tESt appears on the display. Use the down
arrows until “nor” appears on the display.
M540074-01 Rev C 3-9