Operating instructions

Operation SW 5250A•SW 3500A•SW 1750A
3-26 Operation Manual
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The SYSTEM EXTERNAL sub-menu allows you to:
• Select external modes of operation (Direct Input, External Modulation, External
Gain, and Clock/Lock).
• Select alternate compensation (X-LOAD).
• Select Low Frequency for operation below 40 Hz when using an external input.
>Damage to the equipment may occur if input
frequency requirements are violated (DC, 40–5000 Hz).
Refer to Table 2-3 for external analog inputs (EXT_IN_A, EXT_IN_B, EXT_IN_C).
Table 3–3 provides additional data on the External sub-menu.
USER
COMM
EXTERNAL
FAULTS
CONFIG
EXT MOD OFF
DIR INPUT OFF
EXT GAIN OFF
X–LOAD OFF
LOW FREQ OFF
CLOCK/LOCK OUT
SYSTEM OUTPUT [OFF]

EXTERNAL Sub-Menu Status and Information Data:
Menu Item Status and Information Line Range
EXT MOD [external modulation] On / Off
DIR INPUT [external direct input] On / Off
EXT GAIN [external gain control] On / Off
X–LOAD [reactive load stability] On / Off
LOW FREQ [for external freq Below 40Hz] On / Off
CLOCK/LOCK [clock lock enable/disable] In / Out / Off