HP 8901B

Operation Model 8901B
Before the Modulation Analyzer is switched on, all protective earth termi-
nals, extension cords, auto-transformers, and devices connected to
it shouM
be connected to a protective earth socket. Any interruption of the protective
earth grounding will cause a potential shock hazard that could result in
personal
injury.
For continued protection against fire hazard, replace the line fuse with a
250V normal blow fuse of the same rating. Do not use repaired fuses
or
short-circuited fuseholders.
The Modulation Analyzer has a standby state and an on state. Whenever the power cable is plugged in,
an internal power supply is activated. In instruments supplied with the high-stability reference (Option
002) the supply energizes the internal reference oven.
If the Modulation Analyzer is already plugged
in, set the
POWER switch to ON. If the power cable is not plugged 'in, follow these instructions:
1. Check that the line voltage setting matches the power source. (See Figure 2-1, Line Voltage and
he Selection.)
2. Check that the fuse rating is appropriate for the line voltage used. (See Figure 2-1, Line Voltage
and fie Selection.)
fise ratings are provided in the paragraph Operator's Maintenance in
this section.
3. Plug in the power cable.
4. Set the POWER switch to ON.
NOTE
When the POWER switch is set to ON, all front-panel indicators light
for approximately 10 seconds after which the instrument is ready to be
operated.
3-5. INSTRUMENT FEATURES
Front-panel controls, indicators, and connectors are illustrated and referenced to text in Figure 3-1.
The text for this figure describes the various functions of the Modulation Analyzer. At the end of each
description is
a reference to a detailed operating instruction that contains more details on this topic.
Rear-panel features are shown and referenced to text in Figure 3-2. The text for this figure provides
a quick reference for rear-panel signal levels and frequencies and also includes the impedances at the
rear-panel connections.
The information in parenthesis at the end of each feature summary provides the title of the Detailed
Operating Instructions
relevant to the feature.
3-4