Technical data

2-3
Front/Rear Panel
Front Panel Features
functions of the active display channel.
8. ACTIVE CHANNEL keys. The analyzer has two independent primary channels and two auxiliary
channels. These keys allow you to select the active channel. Any function you enter applies to the
selected channel.
9. The ENTRY block. This block includes the knob, the step up and down keys, the number pad, and the
backspace key. These allow you to enter numerical data and control the markers.
You can use the numeric keypad to select digits, decimal points, and a minus sign for numerical entries. You
must also select a units terminator to complete value inputs.
The backspace key has two independent functions: it modifies entries, and it turns off the softkey menu so
that marker information can be moved off of the grids and into the softkey menu area. For more details,
refer to the “Making Measurements” chapter in the user’s guide.
10. INSTRUMENT STATE function block. These keys allow you to control channel-independent system
functions such as the following:
• copying, save/recall, and GPIB controller mode
• limit testing
• tuned receiver mode
• test sequence function
• GPIB STATUS indicators are also included in this block.
11. Preset key. This key returns the instrument to either a known factory preset state, or a user preset
state that can be defined. Refer to Chapter 8, “Preset State and Memory Allocation” for a complete
listing of the instrument preset condition.
12. PORT 1 and PORT 2. These ports output an RF signal from the source and receive electrical signals
from a device under test. The ports provide the stimulus for E/O devices and the receiver O/E devices.
PORT 1 allows you to measure S
12
and S
11
. PORT 2 allows you to measure S
21
and S
22
.
13. OPTICAL OUTPUT and OPTICAL RECEIVER ports. The OPTICAL OUTPUT port emits a lightwave
signal from the internal laser and allows you to measure devices that require an optical stimulus. The
OPTICAL RECEIVER port receives lightwave input signals from an optical device under test and allows
you to measure the device response.
14. LASER OUTPUT and LASER INPUT ports. The LASER OUTPUT port emits a lightwave signal from the
internal laser and allows you to modulate a device under test. the LASER INPUT port allows you to use
an external laser for 8703B measurements.
15. LASER ON/OFF. The LASER ON switch position allows analyzer internal laser to output a lightwave
signal from the OPTICAL OUTPUT port. The LASER OFF switch position shuts down the analyzer
internal laser.