Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 87
14
MODULATION
REFERENCE - C
Analog
Input
±7.07V External modulation signal input terminal for Phase-C.
15 ISO_COM Return Return
Isolated signal return / Common ground terminal for
Pins 4, 5, 11, 12, 13, and 14.
Table 4-1: External Input/ Output Control Connector Pinout
4.2.1 External Synchronization
An external Synchronization Signal is given to pin-2 (SYNC_HIGH) and pin-3 (SYNC_LOW) present in the
External I/O Control Signal 15-pin connector available on the rear panel; refer to Table 4-1 for pinout
details. Applying an external square waveform of the range between 0V to 5V with desired frequency on
SYNC_HIGH and SYNC_LOW pins will allow the user to control the output frequency and phase of the
waveform generated by the internal generator; refer to Figure 4-5.
Figure 4-5: Synchronization Signal Pinout Diagram
4.2.2 Remote Inhibit
External I/O Control Signal 15-pin connector is provided with remote inhibit inputs; refer to Table 4-1 for
pin-out details. A contact closure (direct shot) or contact open between Inhibit and Return / ISO_COM pins,
will allow the output to be enabled/disabled based on the selection between LOGIC-LOW or LOGIC-HIGH;
refer to Figure 4-6 for the pinout diagram.
The default logic level for Remote Inhibit is a logic-low or contact closure between /INHIBIT_ISO (Pin-4)
and ISO_COM (Pin-1). This will cause the output voltage to be programmed to zero volts and the output
relays to open. This logic level could also be selected with the SCPI command, OUTPUT:RI:LEVEL LOW.
Alternatively, the logic level could be changed by the user to logic-high using the remote digital interface
SCPI command, OUTPUT:RI:LEVEL HIGH. A logic-high (5V) or open-circuit between /INHIBIT_ISO (Pin-
4) and ISO_COM (Pin-1) will cause the output voltage to be programmed to zero volts and the output
relays to open.
The mode of operation of the Remote Inhibit can be changed using the remote digital interface SCPI
command, OUTP:RI:MODE <mode>. The following modes can be selected:
LATC(hing) A TTL logic-low (or user-selected logic-high) at the Remote Inhibit input latches
the output in the protection shutdown state; this state could only be cleared by the
remote digital interface SCPI command, OUTPut:PROTection:CLEar.
LIVE The output state follows the state of the Remote Inhibit input. A TTL logic-low (or
user-selectable logic-high) at the Remote Inhibit input turns the output off; a TTL
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