Sequoia / Tahoe Series User Manual California Instruments
90 M447352-01 REV-A
Figure 4-9: Output On/Off Status Pin-out Diagram
4.2.6 External Analog Modulation of Output Voltage (Source and Grid-Simulator MODE)
NOTE: This function is available in both the SEQUOIA and TAHOE series power supply, and for the
SEQUOIA series, this function is applicable only in SOURCE and Grid-Simulator Modes of operation. Also,
the external modulation signal is limited to a maximum peak of 485V so that the signal peak would not go
beyond 485 V in the HIGH range and 242.5 V in the LOW range.
Users can program the output voltage amplitude to be modulated based on the AC waveform provided to
the External Modulation Reference Signal pins. Applying an external AC Waveform of the range between
(0 to 5 Vrms) or (0 to ±7.07V pk) to the External I/O Control Signal Connector can provide 0-10% of full-
scale output voltage amplitude modulation.
Pin 12 (External Modulating Signal – Phase A) and Pin 10 (Return / ISO_COM) are to be connected to an
AC source to vary the output voltage for Phase A, refer to Figure 4-10.
Pin 13 (External Modulating Signal – Phase B) and Pin 10 (Return / ISO_COM) are to be connected to an
AC source to vary the output voltage for Phase B, refer to Figure 4-11.
Pin 14 (External Modulating Signal – Phase C) and Pin 10 (Return / ISO_COM) are to be connected to an
AC source to vary the output voltage for Phase C, refer to Figure 4-12.
The mentioned above pins are present in the External I/O Control Signal Connector (EXT I/O) available
on the rear panel; refer to Table 4-1 for pin-out details.
Figure 4-10: Modulation Reference Signal Pinout diagram for Phase A
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