Gamry Reference 600+, Руководство оператора

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18
Figure 3-6
DC-DC Power Conversion
Notes for Figure 3-6:
• Note the ground isolation between the input power and the Reference 600+ circuitry. The
Reference 600+ chassis is connected to the Floating Instrument Ground.
Transformers and digital isolators are the only components connected between the grounds.
•
The 300 kHz power-supply sync signal is derived from the same clock used to control data-
acquisition. Data points taken at an integer-multiple of 3.333

S/point are synchronized with the
power supply, minimizing the effect of power-supply noise on the data.
•
Additional circuitry that is not shown protects the Reference 600+ against ESD (electrostatic
discharge) and electrical surges. Note that the Reference 600+ is also protected against damage if
an incorrect polarity power input is connected to the unit.
•
The incoming DC voltage must be between 22 and 26 V. With inputs below 22 V, the PWM
(Pulse Width Modulator) may be unable to regulate the supply. Above 26 V, the PWM may not
start up.
Caution:
Do not use a DC power source other than the AC adapter model
provided with your Reference 600+. Other replacements may void the performance and/or
safety characteristics of the Reference 600+.
Power input voltages less than 20 V or greater than 32 V can damage the Reference 600+ ’s
power supply.