(6) HP-1B Status Indicators
These indicators—RMT (remote), TLK (talk), LTN (listen), and SRO (service
request)--show the 4278A's status when interfaced to a controller via HP-1B.
These four indicators are valid only when the 4278A is equipped with an HP-
18 interface option.
(7) LCL (local) Key
This key sets the 4278A to local control if an HP-I8 Option is installed.
(8) TRIGGER Key
This key triggers the 4278A when the 4278A is set to the MANual TRiGger
mode.
(9) LOAD Key
The LOAD key loads control setting data from an installed memory card.
(10) MEMORY Card Slot and UNLOCK Button
The MEMORY card slot is for inserting memory cards. To eject a memory
card, press the UNLOCK button and remove the memory card.
(11) CURSOR keys
These four arrow keys move the cursor on the LCD in the direction of the
arrow.
(12) CONTRAST Adjust Control
This knob controls the contrast of the LCD.
(13) UNKNOWN Terminals
These terminals are for connecting four terminal-pair test fixtures or test
leads.
(14) Guard Ter mi nal
This terminal is tied to the instrument's chassis and can be used for mea-
surements that require guarding.
Figure 2-1. Front Panel Features (Sheet 2 of 2)
2-3
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