The Chroma 63800 Electronic Loads can simulate a variety of load conditions under high crest factor and varying power factors with real time compensation even when the voltage waveform is distorted.
This unique feature provides real world simulation capabilities and prevents overstressing the instrument resulting in reliable and unbiased test results.
The 63800’s state of the art design uses DSP technology to simulate non-linear rectified loads with its unique RLC operation mode. This mode improves stability by detecting the impedance of the UUT and dynamically adjusting the load’s control bandwidth to ensure system stability.
Available comprehensive measurements allow users to monitor the output performance of the UUT. Additionally, voltage & current signals can be routed to an oscilloscope through built in analog outputs. The instrument’s standard GPIB/RS232 interface provides remote control & monitoring for system integration. Built-in digital outputs may also be used to control external relays for short circuit (crowbar) testing.
Chroma’s 63800 Loads feature fan speed control ensuring low acoustic noise. The diagnosis/protection functions include self diagnosis routines and protection against overpower, over-current, over-voltage and overtemperature scenarios.
- Power Rating:1800W/3600W/4500W
- Voltage Range: 50V – 350Vrms
- Current Range: Up to 45Arms
- Peak Current: Up to 135A
- Frequency Range: 45 to 440Hz, DC
- Crest Factor Range: 1.414 to 5.0
- Standard GPIB and RS232 interfaces
- Parallel units for higher power or synchronize for three phase operation
- Maximum paralleled power: 22.5KW single phase / 67.5KW three phase
Complete AC & DC Load Simulations
Chroma’s 63800 AC & DC Electronic Load is designed for both AC & DC Load Simulations. Illustrated below are the various load modes which are available:
-AC Load Simulation
--Constant Load Modes
--- CC Mode
--- CR Mode
--- CP Mode
--Rectified Load Modes
--- RLC Mode
--- Inrush Mode
--- CP Mode
-DC Load Simulation
-- CR Mode
-- CP Mode
-- CC Mode
-- CV Mode
-- Rectified Mode
AC Load Simulation
The Model 63800 AC & DC Electronic Load provides two unique operating modes for AC load simulation; (1) Constant Load Mode and (2) Rectified AC Load Mode. Each are described below.
Constant Load Modes
The Constant Load Modes allow users to set the following operating modes: CC, CR and CP mode. The CC and CP modes in this category allows users to program PF, CF, or both. For CR mode the PF is always set to 1. The power factor range is limited based on crest factor programmed (Shown as Figure 1). If the programmed PF is positive then the current will lead the voltage waveform. When PF is set negative, the current will lag the voltage waveform.
Rectified AC Load Modes
The 63800 AC & DC Electronic Load provides unique capability to simulate non-linear rectified loads for a wide range of testing applications. There are three load modes available for rectified load simulations: RLC, CP and Inrush Current.
For inrush current simulation, the 63800 has an Inrush Current mode that allows the user to set different inrush current amplitude and voltage phase angle where the inrush current started.
DC Load Simulation
Chroma’s 63800 DC load simulation includes four load modes: constant current, constant resistance, constant voltage and constant power as depicted below. CC, CR, CP mode can be used for regulated voltage power supply testing. For battery charger, CV mode may help to check its current regulation. Many inverter designs, although its input is DC, show an input current and will show rectified pattern. This unique load mode makes the Chroma 63800 load ideal for Fuel Cell, PV module/array and Battery testing.
Chroma’s 63800 Series AC & DC Electronic Loads include built-in 16-bits precision measurement circuits to measure the steady-state and transient responses for true RMS voltage, true RMS current, true power(P), apparent power(S), reactive power(Q), crest factor, power factor, THDv and peak repetitive current. In additional to these discrete measurements, two analog outputs, one for voltage and one for current, are provided as a convenient means of monitoring these signals via an external oscilloscope.
Timing parameters are critical to many products such as UPS’s Breakers and Fuses. The 63800 AC & DC Load also includes a unique timing and measurement function to measure the trip time of fuses & circuit breakers or the transfer time for UPS’s (Off-Line).
Automatic Bandwidth Adjustment (ABA)
When the UUT, such as one shown in Figure 8, has a higher output impedance, the current waveform will not be stable without ABA. In most cases, the loading current will be oscillating and spoil the test.
Parallel / 3-Phase Control
The 63800 series provides parallel and 3-phase functions for high power and three phase applications. All the models within the 63800 series can be used together for both parallel and 3-phase functions as well as paralleled AC Load units in a 3-phase configuration, providing excellent flexibility and cost savings for the 63800 series AC load.
Auto Power Factor Correction
Setting the power factor is one of the major features to the 63800. Since PF is a function of real time voltage and current, traditional AC load designs assume the voltage waveform to be sinusoidal all the time. This is not realistic because the voltage waveform may be distorted after the load is applied.
63802 - Programmable AC Electronic Load 1800W/18A/350V
63803 - Programmable AC Electronic Load 3600W/36A/350V
63804 - Programmable AC Electronic Load 4500W/45A/350V
A638001 - Rack Mount Kit 
A638002 - Rack Mount Kit [63803/63804]
10604 - SoftPanel KIT 
8545-01 - Cable Kit with Terminal Resistors, 3 phase sync/Parallel Cable
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