HP 3457A Service Manual page 54

Operation 3457A
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FUNCTION KEYS - The function keys select the type of measurement. Available functions are: DC
volts (DCV), AC volts (ACV), AC+DC volts (ACDCV), 2-Wire Ohms (OHM), 4-Wire Ohms (OHMF), DC
current (DCI), AC current (ACI), AC+DC current (ACDCI), Frequency (FREQ) and Period (PER).
® ANNUNCIATORS - The 12 annunciators across the bottom of the display indicate the present
operating conditions of the instrument. The purpose of each annunciator is as follows:
SMPL - The Sample annunciator flashes to indicate display updates. The maximum display rate
is 5 updates per second. The annunciator does not indicate measurement rate.
REM - The Remote annunciator is on when the instrument is being controlled from the HP-1IB.
SRO - The Service Request annunciator is on when the instrument is requesting service from
the controller.
ADRS - The Addressed annunciator is on when the instrument has been addressed to talk or
listen on the bus.
AC+DC - The AC+#DC annunciator is on when the DC coupled AC voltage or current function has
been selected.
4WQ - The 4-Wire Ohms annunciator is on when the 4-Wire Ohms function has been selected.
AZOFF - The Auto-Zero Off annunciator is on when the Auto-Zero feature has been disabled.
MRNG - The Manual Range annunciator indicates the Auto-Ranging feature has been disabled.
MATH - The Math annunciator is on when the mathematics feature the mathematics feature has
been selected.
REAR - The Rear Input annunciator indicates that the Rear Input Terminals have been
selected.
ERR - The Error annunciator flashes when an error condition exists. Error information is
stored in the error registers.
SHIFT - The Shift annunciator is activated when the blue shift key is pressed.
Figure 3-3. Front Panel Features
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