Specifications

BC-535 Preliminary, Rev. 060126 9

reading of the capacitance in pF. The dial is calibrated to 50 pF/turn.

Power

Immediately adjacent to the CAP COMP block is the master power switch for the

BC-535. An LED indicates power on status.

Rear panel

The instrument rear panel has BNC connectors for GAIN and FILTER TELEGRAPHS, I

OUTPUT, CAP SYNC, EXTERNAL RESET IN, and EXTERNAL COMMAND IN. A 9-pin DIN

connector (for the headstage), a 15 pin I/O

INTERFACE, binding posts for CIRCUIT and

CHASSIS GROUND, and a SPEAKER OUTPUT are also located on the rear panel.

The photo below shows the various attachment points on the instrument rear panel. Connections

are described right-to-left.

Headstage

The HEADSTAGE is housed in a small aluminum enclosure and connects to the amplifier via a 1.8 meter

cable. A 9-pin DIN connector is provided for this attachment.

Note: When routing the headstage cable from your Faraday cage to the instrument, we recommend

intertwining the headstage and ground cables to minimize ground loops.

Circuit and chassis grounds

CIRCUIT and CHASSIS GROUND binding posts are provided at the rear of the amplifier to allow

modification of instrument grounding.

The CHASSIS GROUND binding post is internally connected to the green-wire ground of the power

plug. Therefore the instrument does not normally require a separate ground. However, it may become

necessary to independently ground the chassis of the

BC-535 when it is used as a freestanding device

and not incorporated into a rack.

The CIRCUIT GROUND binding post allows external connection to the internal ground circuitry of

the amplifier. This post is used to provide a common circuit ground point for all active components

(Faraday cage and contents, SUNStir-3 assembly, temperature controller, etc.) within the bilayer rig,

thus preventing ground loops.

In general, the internal circuitry of the

BC-535 maintains a virtual ground and is not normally not

connected to chassis ground. However, when necessary, the

CIRCUIT GROUND binding post can be used

to tie the circuit and chassis grounds to a common potential. This is the default configuration when the

instrument is shipped from the factory.

Warner

Instruments

A Harvard Apparatus Company .