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SECTION III
Model 4277A
0LINE OFF/ON Switch:
Applies ac line power to the instrument when
set to the ON (j».in) position.
Removes ac
line power when set to the OFF ( Mout)
position.
(D HP"IB Status Indicators and LOCAL Key:
These four LED lamps—SRQ, LISTEN, TALK,
and
REMOTE—indicate the status of
the
4277A when it is interfaced with a controller
via the HP-IB.
The LOCAL key, when pressed, releases the
instrument from
REMOTE (HP-IB) control
and enables front panel control. The LOCAL
key is disabled (does not function) when the
instrument is set to "local lockout" by the
controller.
@ SELF TEST Key and Indicator :
This
key
initiates
the instrument's
SELF
TEST function. During SELF TEST (when the
indicator is on), nine tests that check the
basic
operation
of
the
instrument
are
automatically
performed.
SELF
TEST
is
repeated until this key is pressed again. If a
fault is detected, an err^ code
will be
displayed on DISPLAY A (s).
A complete
description of the SELF TCST function is
given
in
paragraph
3-5; error
codes
are
described in paragraph 3-20.
(0 Trigger Lamp :
Comes
on
each
time
the
instrument
is
internally, externally, or manually triggered.
Trigger mode is set by the TRIGGER keys
@ DISPLAY A :
Displays
measured
values
of
inductance,
capacitance, or impedance magnitude with a
maximum 4-1/2 digits; maximum display is
19999.
Number of display digits depends on
instrument control settings.
The nine LED
lamps located to the right of the display are
the engineering unit indicators for displayed
values.
Measurement
error messages—OF,
UF, CF—operation error codes, SELF TEST
error
codes,
and
the
instrument's
HP-IB
address are also displayed on this display.
If the instrument is equipped with Option
002, Comparator/Handler Interface, the LOW
LIMITS keyed in from the 16064A will be
displayed on this display when the 16064A is
set to ENABLE and RUN is off.
Decimal point location and engineering unit
indicator lamp
change when the
LC | Z j
RANGE (ij) changes.
Figure 3-1. Front Panel Features (Sheet 1 of 6).
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