Gpib Connector; Digital I/O Connector; Pre-Amp Power Connector; Ref Mon Connector - Ametek 7280 Instruction Manual

way. Each unit must be set to a unique address (see section 5.3.22). Pinouts for this
connector are given in appendix B.

4.2.05 GPIB Connector

The GPIB interface connector conforms to the IEEE-488 1978 Instrument Bus
Standard. The standard defines all voltage and current levels, connector
specifications, timing and handshake requirements.

4.2.06 DIGITAL I/O Connector

This connector provides eight TTL lines, each of which can be configured as inputs
or outputs. When set as an output, each line can be set high or low by the use of the
Digital Port menu or via the computer interfaces, and when set as an input, the
applied logic state can be read.
The port is most commonly used for controlling auxiliary apparatus, such as lamps,
shutters and heaters, and reading status signals from auxiliary equipment. Pinouts for
this connector are given in appendix B.

4.2.07 PRE-AMP POWER Connector

This connector supplies ±15 V at up to 100 mA and can be used for powering
optional remote preamplifiers available from SIGNAL RECOVERY. Pinouts for this
connector are given in appendix B.

4.2.08 REF MON Connector

The signal at this connector is a TTL-compatible waveform synchronous with the
reference. This output monitors correct reference channel operation but its polarity is
not uniquely defined so that it does not necessarily show the correct phase
relationship with the SIG MON output.

4.2.09 REF TTL Connector

This connector is provided to allow TTL-compatible pulses to be used as the
reference input, if the best possible phase accuracy at low external reference
frequencies is required, when it usually gives better results than the REF IN
connector on the front panel.

4.2.10 DAC 1 and DAC 2 Connectors

There are two digital-to-analog converter (DAC) output connectors. The output
voltages at these connectors can be set either from the front panel or by the use of
remote computer commands. The output range is ±10.000 V and the resolution is
1 mV.

4.2.11 CH 1 and CH 2 Connectors

The signal at these connectors is an analog voltage corresponding to a selected
output, such as X, Y, R, θ, etc., as specified in the Analog Outputs menu. The full-
scale output voltage range is ±2.500 V although the outputs remain valid to ±7.500 V
Chapter 4, FRONT AND REAR PANELS
4-7