The Output had both Constant Current Control and Constant
Voltage Control. The CC control is also a Short circuit
protection. The Output was protected from outside voltages
damaging output circuits even when equipment is switched off.
The back panel is a finned anodized black aluminum heat sink
with many transistors.
The catalog that was made is here - Regulated
Power Supply 30V 5A
SMPS have now replaced Regulated Power Supplies that use a Low Frequency Step Down Transformer. Switching Supplies are light and small, very efficient too (power conversion).
Efficiency Step Down Isolated Supply - This is a SMPS
which is used to Power Equipment.
A regulated, low ripple, high voltage of very low current
capability is applied by instrument on a DUT (device under
test). The leakage current in nA or pA (picoamps, nanoamps) is
measured and readout, The Innovation i did was to measure the
current in Vref and not Vin of ICL7107, this made the 1/x
Winding Insulation Resistance Measurement
Also using the ICL7650 Chopper Stabilized amplifier must be done as shown in data sheets with grounded guard rings. pA will leak on the PCB itself if layout is not done keeping this in mind
30th Aug 2020
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