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Model 4277A
SECTION III
® DISPLAY B
Displays
measured
values
of
dissipation
factor,
quality
factor,
equivalent
series
resistance, conductance or impedance phase
angle with a maximum 4-1/2 digits; maximum
display is 10000 for quality factor, 18000 for
phase, and 19999 for all other parameters.
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, and
CF--are also displayed on ^s display. When
the DISPLAY A Function
@
is set to HIGH
SPEED L or HIGH SPEED C, or when ^ error
code is displayed on DISPLAY A (s), this
display
is
blanked
(turned
off)
by
the
microprocessor.
If the instrument is equipped with Option
002, Comparator/Handler Interface, and if
the 16064A comparator is connected, the
number
16064
will
be
displayed
on
this
display when the instrument is turned on.
Also, the HIGH LIMITS keyed in from the
16064A will be displayed on this display when
the 16064A is set to ENABLE and RUN is off.
(®
A
Key and Indicator :
This key enables deviation
(A)
measurements
on both displays.
When this key is pressed,
the values dis^yed on DISPLAY A ® and
DISPLAY
B ® are
stored
as
reference
values.
The
difference
between
values
obtained in subsequent measurements and the
stored reference values is calculated and
displayed on each display. The formula used
to calculate- the deviation is
A-B
Where A is the measured value of the device
under test and B is the stored reference value.
LC ! Z 1 RANGE (@ is set to MANUAL when
this key is pressed.
Also, the deviation measurement function is
turned off by pressing this key again, or by
changing
the
DISPLAY
A
function
(IJ),
mSPLAY B function @, LC ! Z I
RANGE
or CIRCUIT MODE
It may be
turned off also if the test frequency is
changed when the DISPLAY B function is
ESR/G.
® FREQUENCY/DC BIAS Display:
Displays test frequency or DC bias voltage
(Option 001 only) with 3 digits.
The three
LED lamps located to the right of the display
are unit indicators for displayed values.
On
instruments
equipped
with
Option
002,
Comparator/Handler Interface, bin numbers
are
displayed
on
this
display
when
the
comparator is set to RUN.
Also, on Option
001 instruments, the number 001 is briefly
displayed here when the instrument is turned
on.
® FREQUENCY/DC
BIAS
Select
Key
and
Indicators:
This key sets the FREQUENCY/DC BIAS
Displ^
®,
the SPOT/COARSE/FINE Select
key 0, and the FREQUENCY/DC BIAS Step
Control Keys
@
to FREQUENCY control
mode
or
DC
BIAS
control
mode.
The
selected control mode is indicated by the
corresponding LED lamp.
FREQ :
When
this
LED
lamp
is
on,
frequency is displayed on the
FREQUENCY/DC BIAS Display
and
is
controlled
by
the
SPOT/COARSE/FINE
Key
and
the FREQUENCY/DC BIAS Step
Control Keys.
DC BIAS : When this LED lamp is on, DC
bias voltage is displayed on the
FREQUENCY/DC BIAS Display
and
is
controlled
by
the
FREQUENCY/DC
BIAS
Step
Control Keys.
FREQUENCY control mode and DC BIAS
control mode are mutually exclusive, and
DC
BIAS can
be
selected
only
if
the
instrument is equipped with Option 001.
Figure 3-1. Front Panel Features (Sheet 2 of 6).
3-3
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