HP 3457A - DISPLAY; CONFIGURATION KEYS; INPUT TERMINALS

Operation
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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)