Can the eLoad be field calibrated?
All AMREL eLoads utilize a digital closed-case calibration scheme. The calibration adjustment can be done via the keypad or PC control interface as long as a properly rated shunt, voltage/current source, and DMM are used. It is recommended that the load be calibrated / adjusted once per year.
Can the eLoad operate at 0 Volts?
The eLoad can operate down to 0 Volts. However some models require a minimum voltage ranging from 0.4V to 5V for full power dissipation (derated current). Please reference the model data sheets to determine the minimum voltage specifications. AMREL’s ZVL series can operate at 0V at full power (no current derating).
How is the slew time (rise/fall time) of the eLoad calculated?
Slew rate is defined as: rate of change in value where value can be current, voltage, resistance or power. AMREL’s eLoads specifies the slew rate in terms of slew time, which is actually the time portion of the slew rate. This allows programming of the time period between two preprogrammed levels.
Can I parallel the eLoads together to obtain higher power and current?
It is generally recommended to parallel the eLoad when the objective is to share the current. Paralleling the eLoad in other operating modes such as CR and CV will work properly; however the timing and setting of each eLoad will then become critical. For correct timing and equal current sharing, most AMREL eLoads can be master/slaved paralleled using their trigger inputs and outputs.
How do I perform external analog programming or ac modulation?
The external control function allows the load’s main level voltage, current, power and resistance max range setting to be scaled from 0 to 10 Volts. Once the external control is enabled, the voltage (0~10V) inputted through the EXT_PRG and EXT_GND port will adjust the current, voltage, resistance or power level accordingly. The eLoad offers external programming support for ac voltage range of -1V ~ 10V and frequency range of dc ~ 10 kHz.
Does the eLoad offer soft-start features?
The eLoad offers two layers of soft-start protection. The turn-on sequence for each mode and range is designed to minimize current overshoot and system instability. For more sensitive applications, an “under-voltage protection” (V-On Control) feature is available. The V-On control will prevent the load from turning on until a voltage threshold is reached. The V-On Voltage is adjustable depending on the application and can be used to simulate different types of testing.
Can I switch ranges while the input is on?
The eLoad has three overlapping operating ranges in each mode. As part of our factory default settings, when switching from one range to another in manual mode (i.e. Constant Voltage Low to High), the input will automatically turn off for the final switched state. If an application requires the input to stay on when switching ranges, the option “cross range” must be changed from “input off” to “input remain.” By changing the option, the load will switch ranges while keeping the input on, so different DUT applications can be accommodated. Cross range operation will work under both “manual” and “auto” range control modes.
Does the eLoad offer different power-on settings to be saved?
There are four user-defined profiles that can be saved in locations 0, 1, 2, and 3. The factory default profile is stored in locations 0 and 3 and can be loaded any time to restore the load to default settings. The syntax profile stored in location 2 will configure the load to become PEL command compatible.
How is the accuracy calculated for CR mode?
To calculate accuracy for CRM and CRH mode, please follow the procedures below:
1) Convert Rset to mS units > mSset (Resistance value in mS units).
2) Calculate %error in mS units.
3) Calculate mSset + %error + Offset.
4) Calculate mSset + %error – Offset.
5) Convert both values back to resistance values to obtain accuracy range.
Is there an external method for shutting off the eLoad input?
Short the remote inhibits (RI) rear terminal connectors. Also, an available TTL fault signal will trigger into an active high state, in the case of any fault conditions.
Does the water-cooled eLoad offer an anti-condensation feature?
Yes. The eLoad incorporates an automatic anti-condensation, liquid cooling system. This is accomplished via a water valve controlled by the load’s operating temperature.
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