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SECTION m
Model 4277A
3-35. INITIAL DISPLAY AND INDICATIONS
Note
3-36. Each time the instrument is turned on,
the option codes for installed options and the
HP-IB address are displayed on the front panel
for
approximately
two
seconds.
The
HP-IB
address is displayed on DISPLAY A, as shown
below. The factory set address is 17 (10001), but
any address from 0 (00000) to 30 (11110) can be
set.
Refer to the HP-IB discussion starting in
paragraph 3-76.
Note
If the instrument is set to TALK ONLY
mode, the output data format number
(see paragraph
3-90) will appear on
DISPLAY
A
instead
of
the
HP-IB
address.
The
following
option
code
is
displayed
on
DISPLAY B if the instrument is equipped with
Option 002, Comparator/Handler Interface.
/ C m c
u
I
O
L,i
I
o o o
o o o
mS i
0 0 0
0
Output from the internal dc bias source
(option
001
instruments)
is
automatically set to OV at instrument
power on as a safety precaution.
3-38. INITIAL CONTROL SETTINGS
3-39. The 4277A is automatically set to the
control settings listed below when the continuous
memory function (refer to paragraph 3-40) is
reset as described in paragraph 3-43.
DISPLAY A Function .C
DISPLAY B Function .G
CIRCUIT MODE .AUTO
LCIZI
RANGE.AUTO
MEASUREMENT SPEED.MED
TEST SIGNAL LEVEL.HIGH
TRIGGER.INT
SELF TEST.OFF
A...OFF
FREQ/DC BIAS.FREQ
SPOT/COARSE/FINE.SPOT
Frequency.l.OOkHz
OPEN ZERO DATA.
QQ
SHORT ZERO DATA.OS
When the instrument is equipped Option 001:
DC BIAS . .OOV
When the instrument is equipped Option 002,
control settings of the 16064A Comparator are
as follows:
Note
The above option code will not
be
displayed
if
the
16064A
Comparator/Handler
Interface
is
not
connected to the instrument.
ENABLE.OFF
LC ! Z ! //D/Q/ESR/G.L/C/ | Z |
LIMIT LOW/HIGH.LOW
BIN NUMBER.1
RUN.OFF
BIN LIMITS.blank
The following option code is displayed on the
FREQUENCY/DC BIAS display if the instrument
is equipped with Option 001, Internal DC Bias.
3-37. After the HP-IB address and option codes
have been displayed,
the continuous memory
function automatically recalls the front panel
control
settings
that
existed
when
the
instrument was turned off.
3-40. CONTINUOUS MEMORY
3-41.
The continuous memory function of the
4277A automatically memorizes all front panel
control settings when the instrument is turned
off or experiences a power failure.
When the
instrument is turned on, the memorized settings
are automatically recalled. Continuous memory
is
powered
by
a
rechargeable
2.4V
nickel-cadmium
battery
that
lasts
for
approximately 2 weeks when the instrument is
turned off. The battery is recharged while the
427 7A is turned on.
3-36
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