Advertisement
SECTION in
Model 4277A
(g) SPOT/COARSE/FINE
Select
Key
and
Indicators:
This key selects the SPOT, COARSE, or
FINE vernier mode for frequency changes
mode by the FREQUENCY/DC BIAS Step
Control
Keys
The selected vernier
mode is indicated by the corresponding LED
lamp.
Frequencies possible in each vernier
mode are listed below:
SPOT :
lOkHz, lOOkHz, IMHz
COARSE : lOkHz to lOOkHz in lOkHz Steps
lOOkHz to IMHz in lOOkHz steps
FINE;
lOkHz to 20kHz in lOOHz steps
20kHz to 50kHz in 200Hz steps
50kHz to lOOkHz in 500Hz steps
lOOkHz to 200kHz in IkHz steps
200kHz to 500kHz in 2kHz steps
500kHz to IMHz in 5kHz steps
Note
When the DISPLAY A Function @
is set to HIGH SPEED L or HIGH
SPEED
C,
or
when
the
^EQUENCY/DC BIAS Select Key
@is set to DC BIAS mode, this key
is disabled and the SPOT, COARSE,
and FINE indicators are turned off.
@
FREQUENCY/DC BIAS Step Control Keys:
These
keys— @
and
@ —are
used
in
conjunction with the FREQUENCY/DC BIAS
Select Key ® and the SPOT/COARSE/FINE
Select Key
to set the test frequency and
DC
bias
voltage (Option
001
instruments
only). When FREQUENCY mode is selected
by the FREQUENCY/DC BIAS Select Key®
test frequency is increased in accordance
with
the
selected
vernier
mode
(SPOT,
COARSE,
FINE)
each
time
the
@
is
pressed, and is decreased each time the
@
key is pressed. These keys control DC bias in
a similar manner when DC BIAS mode is
selected
by
the
FREQUENCY/DC
BIAS
Select Key®
When either of these keys is pressed and held,
the value displayed on the FREQUENCY/DC
BIAS Display will continuously change in the
indicated
direction.
The
actual
value,
however, will not change until the key is
released.
Figure 3-1. Front Panel Features (Sheet 3 of 6),
3-4
Advertisement
