Chapter 2 53
Quick Start: Learning How to Make Measurements
If You Encounter a Problem
If the display lights, but the ventilation fan does not start:
❏ Check that the fan is not obstructed. To check the fan, follow these steps:
1. Switch the LINE power to the off position.
2. Check that the fan blades are not jammed.
❏ Contact the nearest Hewlett-Packard office for service, if necessary. A list of
Hewlett-Packard sales and service offices is provided at the end of this guide.
Data Entry Problems
If the data entry controls (keypad, knob, ⇑, ⇓, (⇐, ⇒ keys) do not respond:
❏ Check that the ENTRY OFF function is not enabled.
The ENTRY OFF function is enabled after you press the
Entry Off key. To return to
normal entry mode, press any function key that has a numeric parameter associated
with it, for example,
Start.
❏ Check that none of the keys are stuck.
❏ Check that the selected function key accepts data.
For example,
Scale Ref accepts data, but System does not.
❏ Check that the analyzer's "R" HP-IB STATUS light is not illuminated.
If the analyzer's "R" HP-IB STATUS light is illuminated, a test sequence may be
running, or a connected computer controller may be sending commands or instructions
to, or receiving data from, the analyzer. Press Local if you want to return to LOCAL
control.
If the parameter you are trying to enter is not accepted by the analyzer:
❏ Ensure that you are not attempting to set the parameter greater than or less than its
limit. Refer to the HP 8753E Network Analyzer User's Guide for the parameter limits.
No RF Output
If there is no RF signal at either PORT 1 or PORT 2 connector:
❏ Check that the signal at the test ports is switched on.
• Press
Menu, POWER, SOURCE PWR until ON appears on the SOURCE PWR softkey label.
❏ If you are applying external modulation (AM) to the analyzer, check the external
modulating signal or external gate/trigger signals for problems.
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