The Electronic Load

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The Electronic Load Application Notes ZS PL H&H ZSLC Water-cooled ZSLV Low Voltage PMLI Multi-channel ZSAC AC NL Source-Sink Accessories H&H Application Note #3 Simulation of exponential inrush currents Function Via the analog control input of the ZS electronic load with the help of a few passive components a control signal can be generated which simulates the current consumption of devices with exponentially decaying inrush current peaks. Applications Simulation of current consumption of devices at the point of switching on, e.g. light bulbs, engines etc. Measurement set-up As stated in the circuit, the connected input voltage is fed via an RC network to the analog control input of the device. As soon as the SW1 switch is closed, at the AIN10+ control input the RC network generates a rapid voltage rise with a subsequent exponential fall. The peak current is determined by the value of the connected voltage and the resistors R2 and R3. R1 is used to generate the continuous current which is set after the decay of the poweron process. The current can be calculated from the voltages at the voltage divider R1, R2 and R3 and the technical data of the electronic load. If using the 10 V control input the full current of the selected range flows at 10 V. The decay time constant is calculated from the resistors R2 and R3 with the capacitor C1. The input resistance of the analog control input - 20 kOhm - must also be taken into account. The device must be set to constant current operating mode and external control. For smaller input voltages the 5 V control input can also be used in place of the 10 V control input. Note Example: R1: 10 kΩ R2: 1 kΩ R3: 1 kΩ C1: 100 µF Input voltage: 12 V Electronic load: ZS3606 Note that the load current value depends on the input voltage. Input voltage interferences are coupled by capacitor C1 directly to the control signal. The resistances must be dimensioned such that 10 V is not exceeded at the control input. Otherwise the electronic load could be damaged. Software GTC H&H offers no guarantee for the function of the suggested applications. H&H offers no guarantee for damage resulting from such applications. Switch-on process with electromechanical relay and contact bounce The current also follows the input voltage during the contact bounce. 60
The Electronic Load Function Via the analog control input of the ZS electronic load a direct analog adder. If only one control input is connected, only this signal is voltage and an alternating used to set the load current. voltage from a function If both control inputs are generator can overlap the load connected, the control signals current with alternating current are added. portions. Applications Test of dynamic behaviour of power supplies, simulation of loads with alternating current The ratio at which the signals are added is stated by the ratio of the control voltages (5 V and 10 V) for the rated current. portions. Connecting two external Measurement Set-Up resistors can change the addition ratio. The ZS electronic loads have two external control inputs for the signal levels 0 ... 5 V and 0 ... 10 V. The circuit shows the input amplifier of the ZS electronic load for the calculation of the required resistances. These control inputs are internally connected to an Wiring at the Analog I/O Interface Example If R1 and R2 are both set to 190 kOhm, the 5 V control input in relation to the 10 V control input is valued as a percentage of 10 % of the total control signal. If a function generator is connected, max. 10 % of the current range can be set with an alternating voltage of 10 Vss. Note The superimposed AC current portion does not change the average value of the load current. However the peak load rises. Note that the peak load may not exceed the maximum current of the device, even if the average value is still within the H&H Application Note #4 Superposition of AC setting range. If a portion of the AC current is superimposed whose peak load is greater than the set DC value, the resulting control signal is negative. Distortions can occur in this case. The maximum frequency is determined by the speed of the electronic load. (See current rise and fall times in the datasheet). ZS series input amplifier circuitry Application Notes ZS PL H&H ZSLC Water-cooled ZSLV Low Voltage PMLI Multi-channel ZSAC AC NL Source-Sink Accessories H&H offers no guarantee for the function of the suggested applications. H&H offers no guarantee for damage resulting from such applications. Software GTC 61
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Issue 03/2013 The Electronic Load
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Contents H&H Location Page 4 Qualit
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The Electronic Load H&H and Quality
Page 7 and 8:
The Electronic Load H&H Service is
Page 9 and 10: The Electronic Load RS-232 Interfac
Page 11 and 12: It all started with ... Manufacturi
Page 13 and 14: The Electronic Load ZS4812 Analog C
Page 15 and 16: The Electronic Load Data Acquisitio
Page 17 and 18: The Electronic Load Software Tools
Page 19 and 20: The Electronic Load 1,800 W ... 4,8
Page 21 and 22: The Electronic Load 9,800 W ... 14,
Page 23 and 24: The Electronic Load 18,200 W ... 24
Page 25 and 26: For our customers, precision is key
Page 27 and 28: The Electronic Load 8,000 W ... 24,
Page 29 and 30: The Electronic Load Interface overv
Page 31 and 32: The Electronic Load Input Input res
Page 33 and 34: Our support team never makes you wa
Page 35 and 36: The Electronic Load Available Load
Page 37 and 38: The Electronic Load Technical Data
Page 39 and 40: The Electronic Load ZSAC4226 Remote
Page 41 and 42: The Electronic Load Setting Up Thre
Page 43 and 44: The Electronic Load 400 W ... 21,00
Page 45 and 46: We´re going all out for electricit
Page 47 and 48: The Electronic Load Remote Control
Page 49 and 50: The Electronic Load Calibration Fac
Page 51 and 52: The Electronic Load Type Overview o
Page 53 and 54: The Electronic Load Dimensions h: S
Page 55 and 56: The Electronic Load High Current Ca
Page 57 and 58: The Electronic Load 19“ Racks 19
Page 59: The Electronic Load H&H Application
Page 63 and 64: The Electronic Load Loading AC volt
Page 65 and 66: The Electronic Load H&H Application
Page 67 and 68: The Electronic Load Example 5 CF =
Page 69 and 70: The Electronic Load Option MPP Trac
Page 71 and 72: The Electronic Load Data Logging Du
Page 73 and 74: The Electronic Load Display Both pr
Page 75 and 76: Johann Hackl Helmut Höcherl After
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