22
ready for each of the 3 dynamic test operation modes. Select the dynamic operation mode desired by
pressing the up
or down
keys
followed by pressing the
Enter
key to confirm.
4.2.5 Waveform Control
4.2.5.1 Square Wave
When set in the Continuous mode, with the rise time and fall time are both set tozero, the output wave
is a square wave. The output frequency will be the inverse of the pulse duration sum of both current A and
current B. Since the minimum accuracy of all the time interval is set at 20
μ
S
，
the DC Electronic Load can
read the square wave with amaximum frequency of 25KHz at 50% duty cycle.
4.2.5.2
Triangular Wave
When set in the Continuous mode, with the interval time of current A and current B are both set to zero,
the output wave is a triangular wave. The output frequency will be the inverse of the sum of the rise and
fall times. Since the minimum accuracy of all the time interval is set at 20
μ
S, the DC Electronic Load can
read the triangular wave with a maximum frequency of 25KHz. Since the rising edge and falling edge of the
triangular wave are all stepped within a 20
μ
S interval, the ideal angle of the triangular wave will be in
inverse proportion to the its output frequency. In extreme situations, the triangular wave might function as a
square wave; there are 0-100 different accuracy steps scaled according to the different rising and falling
times set.
4.2.5.3
Trapezoidal Wave
When set in the Continuous mode of the dynamic test operation, and all four timing parameters that
need to be individually set are all greater than zero, theoutput wave is a trapezoidal wave. It has the same
frequency characteristics as the triangular wave.
4.2.6 Trigger Control
In dynamic test operation mode trigger control is initiated when either pulse or trigger mode is set.The
three trigger modes are:
a
、
Keypad trigger
Press the
Shift+Trigger
keys to trigger the DC Electronic load.
b
、
TTL trigger
Send a high pulse with a constant time greater than 5msec to initiate the trigger-through
terminals on rear panel of the DC electronic load.
c
、
PC soft control trigger sends a command to the DC electronic load
4.2.7 List Function (Mode Sequence Steps)
The DC electronic load has a mode sequence list function. A maximum of 8 sequence steps can
be edited and 200 steps within each set of data can be changed Users can alter the duration of each step,
setting the minimum time of each step. Please note the minimum time setting must be a round number no
less than 0.02mS and ranging from 0.02mS to 1310.7mS. The duration of each step is linked to the
minimum time setting. If the minimum time is set at 0.02mS
，
then the duration of each step ranges from
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