Quantum Composers 9730 Series - Manual (Page 49)

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The output circuitry is designed to handle 30W of power and is firmware limited to prevent overdriving the
output circuitry. Figure 12 shows the maximum settable pulse width and minimum settable period at max
pulse width. The minimum period is set to 5 times the set pulse width until it reaches the longest settable
period of 200s.
Figure 13 is a basic diagram of the output control circuitry for both the current pulse output and the
resistance measurement output. The current pulse side has an opamp that controls a high side switching
mosfet and receives feedback from a high side current measuring differential amplifier. The control circuit
has error checks to measure the controlling amplifiers output voltage, mosfets output voltage, and feedback
voltage. If there are any errors with these voltages the output is not allowed to be turned on and the system
will display an error.
The resistance measurement side uses a 4-Wire technique where a known current is sent to the load and the
voltage is measured to give resistance measurement. The current source consists of a high side opamp for
control and output and a high side current measuring differential amplifier as the feedback.
2
3
1
A
Isolation
2
3
1
A
Isolation
.25
ISO+24VDC
2
3
1
A
2
3
1
A
15
1 8 0
Bottom
Current Output
Bottom
Pulse / Res Measurement Switch
ARM & Enable Output Relay
Pulse Current Voltage
Control Circuit Voltage Enable
Test Current Voltage
Top
Voltage Measurement
Top
G
Voltage Monitor .2V/V
G
Current Monitor .5V/A
Current Measurement for Resistance
Voltage Measurement for Resistance
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