Agilent / HP / Keysight 8757D

The Agilent/HP 8757D has four independent display channels that process the signals from the Agilent 85037 series precision detectors, the Agilent 85025 and 85026 detectors, and the Agilent 85027 series directional bridges for logarithmic display, in single channel or ratio mode.

All the display channels of 8757D can display any one of the detector inputs or any ratio combination of detector inputs. Up to 8 operator-selectable colors are available for CRT attributes, such as the grid, measurement traces, and labels.

Traces are stored and normalized with the highest resolution, independent of display scale/division or offset. With adaptive normalization on the Agilent 8757D, calibration data is interpolated when the frequency span is decreased.

Limit lines facilitate quick pass/fail decisions. Limits can be any combination of flat or sloped lines or single points up to 12 segments. They are only available for channels 1 and 2, for traces with 401 points or fewer, and can be stored in save/recall registers 1 through 4.

Up to 9 complete front panel states may be saved or recalled. If the source (Agilent 8360 or 8370 series) is connected to the Agilent 8757 system interface, the front panel states of both the network analyzer and source are saved.

The Agilent 8757 system interface is a dedicated Agilent-IB port used exclusively by the Agilent 8757D to control and extract information from a swept source, a digital plotter, a printer, and a disk drive.

The Agilent 8360 series and Agilent 8370 series synthesized swept sources are specifically made to complement the Agilent 8757D. With these, the Agilent 8757D is able to display start, stop and marker frequencies, save and recall front panel states of both the sweeper and the scalar analyzer, preset both instruments simultaneously, and alternately sweep two different frequency or power ranges and display both simultaneously.

The Agilent-IB buffer speeds measurements by returning the control to the analyzer while outputting data to a plotter or printer. Output two channels (401 points each) of information to the buffer in typically less than 5 seconds.

The Agilent 8757D provides the capability to store and retrieve the analyzer’s instrument state, measurement data, and user accessible display graphics to and from an external Agilent-IB disk drive that is compatible with command subset CS/80.

Data files are stored in Hewlett-Packard’s standard LIF format and can be read by a wide variety of computers, including the Agilent 9000 series 200 or 300. Files can be stored in binary or ASCII format.

The Agilent 85037 series precision detectors are designed specifically for operation with the Agilent 8757D scalar network analyzer and are not compatible with the Agilent 8757A/E, 8756, or 8755 scalar network analyzers.

For improved power measurement accuracy versus frequency, each Agilent 85037 series precision detector includes detector specific frequency response data, stored in an internal EEPROM, which is automatically read by the Agilent 8757D. When used in conjunction with the Agilent 8757D’s internal power calibrator (Option 002), these detectors provide the maximum absolute power measurement accuracy.

The Agilent 85025 and 85026 series detectors are designed specifically for operation with the Agilent 8757 scalar network analyzer and are not compatible with either the Agilent 8756 or the 8755. The Agilent 85025/26 detectors may be used in either AC or DC detection modes.

The Agilent 85027 series directional bridges are designed to operate with either the Agilent 8757 in AC or DC detection modes or with the Agilent 8756 or 8755 in AC detection mode. These bridges offer high directivity, excellent test port match, and a measurement range of up to 50 GHz in coax.