HP 34401A User Manual page 5

Display Annunciators
* Turns on during a measurement.
Adrs Multimeter is addressed to listen or talk over the HP-IB interface.
Rmt Multimeter is in remote mode (remote interface).
Man Multimeter is using manual ranging (autorange is disabled).
Trig Multimeter is waiting for a single trigger or external trigger.
Hold Reading Hold is enabled.
Mem Turns on when reading memory is enabled.
Ratio Multimeter is in dcv:dcv ratio function.
Math A math operation is enabled (null, min-max, dB, dBm, or limit test).
ERROR Hardware or remote interface command errors are detected.
Rear Rear input terminals are selected.
Shift "Shift" key has been pressed.
4W Multimeter is in 4-wire ohms function.
Multimeter is in continuity test function.
Multimeter is in diode test function.
To review the display annunciators, hold down the
turn on the multimeter.
4
Press "Shift" again to turn off.
Shift
key as you