HP 8508A - Rear Panel Features

Operation
3-6 REAR PANEL FEATURES
Figure 3-2. Rear Panel
The Rear Panel Outputs provide dc signals which can be fed to external measuring equipment. There are two
distinct modes of operation for these outputs.
Normal Mode
This mode provides an analog representation of the digital display values, including internal instrument correction
factors. OUTPUT 1 corresponds to DISPLAY 1 and OUTPUT-2 corresponds to DISPLAY2. The update rate is
the same as the-display update rate (approximately 3 readings per second). The sensitivity is imV per displayed
digit. -
A display value of 123.4mV will produce a d.c. output of 1234mV. ~
A display value of -135.7 degrees will produce a de output of -1357mV..
If the MAG RANGE key is used to change the display resolution, the rear panel outputs will change with the
display values.
A typical use of this mode might be to drive a chart recorder or similar logging instrument.
Direct Analog Output Mode
This mode provides continuous direct output signals from the internal magnitude and phase detectors through
"’ 800Hz low-pass filters. Only limited internal instrument correction factors are applied to the output signals. OUT-
PUT 1 corresponds to either A or B magnitude (in mV) whichever is selected on the front panel. OUTPUT 2
corresponds to B-A phase. The full scale deflection (FSD) chosen on the front panel always produces an ae of
1 volt and this defines the OUTPUT 1 sensitivity .
A display FSD of 1000mV will produce an output of 1000mV for an input of 1000mV.
A display FSD of 31.6mV will produce an output of 1000mV for an input of 31.6mV.
The OUTPUT 2 sensitivity is fixed at ImV per 0.1 degrees.
A typical use of this mode might be to make narrowband swept measurements on crystals.
3.8 . E1089
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