Safety and Preparation for Use

***CAUTION***: This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR set for the wrong applied ac input-source voltage or if the wrong fuse is installed.

LINE VOLTAGE SELECTION

The SR510 operates from a 100V, 120V, 220V, or 240V nominal ac power source having a line frequency of 50 or 60 Hz. Before connecting the power cord to a power source, verify that the LINE VOLTAGE SELECTOR card, located in the rear panel fuse holder, is set so that the correct ac input voltage value is visible.

Conversion to other ac input voltages requires a change in the fuse holder voltage card position and fuse value. Disconnect the power cord, open the fuse holder cover door and rotate the fuse-pull lever to remove the fuse. Remove the small printed circuit board and select the operating voltage by orienting the printed circuit board to position the desired voltage to be visible when pushed firmly into its slot. Rotate the fuse-pull lever back into its normal position and insert the correct fuse into the fuse holder.

LINE FUSE

Verify that the correct line fuse is installed before connecting the line cord. For 100V and 120V, use a

½Amp fuse and for 220V and 240V, use a 1/4 Amp fuse.

LINE CORD

OPERATE WITH COVERS IN

PLACE

To avoid personal injury, do not remove the product covers or panels. Do not operate the product without all covers and panels in place.

WARNING REGARDING USE WITH PHOTOMULTIPLIERS

It is relatively easy to damage the signal inputs if a photomultiplier is used improperly with the lock-in amplifier. When left completely unterminated, a PMT will charge a cable to a few hundred volts in a very short time. If this cable is connected to the lockin, the stored charge may damage the front-end transistors. To avoid this problem, provide a leakage path of about 100 KΩ to ground inside the base of the PMT to prevent charge accumulation.

This instrument has a detachable, three-wire power cord with a three-contact plug for connection to both the power source and protective ground. The protective ground contact connects to the accessible metal parts of the instrument. To prevent electrical shock, always use a power source outlet that has a properly grounded protective-ground contact.

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