Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 93
This is an alternative method where the user can program the output voltage based on the AC waveform
provided to the External Reference Signal pins. In this function, the output frequency is limited to 550 Hz
for the HF + FC frequency option units. Applying an external AC Waveform of the range between 0 Vrms
– 7.07 Vrms to the External Analog Control Signal Connector can provide the output voltage to scale
between 0VAC to 166 VAC when the low range is selected. Similarly, 0 VAC to 333 VAC when the high
range is selected.
Pin 1 (Reference Signal – Phase A) and Pin 4 (Return / ISO_COM) are to be connected to an AC source
to vary the output voltage for Phase A, refer to Figure 4-14.
Pin 2 (Reference Signal – Phase B) and Pin 4 (Return / ISO_COM) are to be connected to an AC source
to vary the output voltage for Phase B, refer to Figure 4-15.
Pin 3 (Reference Signal – Phase C) and Pin 4 (Return / ISO_COM) are to be connected to an AC source
to vary the output voltage for Phase C, refer to Figure 4-16.
The mentioned above pins are present in the External Analog Control Signal Connector (EXT ANLG)
available on the rear panel; refer to Table 4-2 for pin-out details.
Figure 4-14: External Analog Programming – Reference AC waveform for Phase A
Figure 4-15: External Analog Programming – Reference AC waveform for Phase B
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