HP 3457A Service Manual page 55
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Also See for 3457A:
- Service manual (182 pages) ,
- Operating instructions manual (363 pages) ,
- Service manual (6 pages)
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Operation
3457A
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DISPLAY - The display is a 12 character alphanumeric Liquid crystal display (LCD). The display
is used to show measurement readings and to display messages. When measurements are displayed,
the first character
indicates
the polarity,
characters
2 through 8 display the measurement
value and the last four characters provide function and range information. The display buffer
stores up to 24 characters. Use the © and > display keys to view displays in excess of 12
characters.
CONFIGURATION KEYS - The Math Keys are used to set the operating parameters of the instrument.
These keys permit the user to access the command catalog to configure 62 operating parameters.
The most commonly used parameters are set by pressing one of the sixteen configuration keys and
entering the appropriate parameter value.
MATH KEYS - The
Math
Keys
access
13
built-in
mathematical
functions.
INPUT
TERMINALS
- The
five
Input
Terminals
provide
HI
and
LO
input
conections
voltage
resistance
and current measurements.
DC voltage,
AC voltage, AC+DC voltage and 2-Wire resistance measure-
ments are made through
the INPUT HI and LO terminals.
DC current
AC current
and AC+DC current
measurements
are
made
through
the
INPUT
LO
and
I terminals.
4-Wire
resistance
measurements
are
made through the { SENSE HI and LO terminals and the INPUT HI and LO terminals.
FUSE - The fuse protects the current input circuitry by limiting the input current to 1.5 amps.
OTHER KEYS - These special keys perform the following functions:
E/SRQ
key
-
In
the
normal
state
this
key
allows
the
user
to
enter
exponents
(E).
In
the
shifted
state,
this
key sets
the Request
Service
bit.
-/ERROR
key
-
In
the
normal
state,
this
key
is
used
to
enter
negative
numbers.
In
the
shifted
state,
this
key
is used
to
read
the
Error
Register.
BACK
SPACE/CLEAR
key
-
In
the
normal
state,
this
key
is
used
to
back
space
to
correct
entries. In the shifted state, this key clears the display.
ENT/LAST ENTRY key - In the normal
state,
this key is used to enter
information
into
memory. In the shifted state, this key recalls the last entry made.
DISPLAY KEYS - These keys are used to change measurement
ranges,
scroll through the command
catalog, shift display messages left or right, run the instrument self test routine, reset the
instrument,
read
the
HP-18
address
and
return
the
instrument
to
local
(manual)
control.
Figure 3-3. Front Panel Features (cont'd)
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