(5) CURSOR Keys
The CURSOR keys are used to move the eld select cursor from eld
to eld on the LCD display page. When the cursor is moved to a
eld, the eld changes to an inverse video image of the original eld.
The cursor can only b e moved from eld to eld.
(6) ENTRY Keys
The ENTRYkeys are used to enter numeric data into the HP 4284A.
The ENTRYkeys are comp osed of the digits
4
0
5
to
4
9
5
, a p erio d
4
.
5
,
a minus sign
4
-
5
,
4
ENTER
5
, and
4
BACK SPACE
5
keys.
4
ENTER
5
terminates
numeric input data and enters the displayed value on the Input
Line (second line from the b ottom of the LCD screen).
4
BACK SPACE
5
deletes one last character of the input value.
(7) HP-IB Status Indicators
The HP-IB status indicators consist of the RMT (remote), TLK
(talk), LTN (listen), and SRQ (service request) indicators. These
indicators are used to show the HP 4284A's HP-IB status when it is
interfaced to a controller via HP-IB.
(8)
4
LCL
5
Key
This is the Lo cal (LCL) key which sets the HP 4284A to lo cal
(front-panel) control, if it was in REMOTE and if the HP-IB
controller had not invoked a lo cal lo ckout.
4
LCL
5
is the only
front-panel key that is active when the HP 4284A is in REMOTE
state.
(9)
4
TRIGGER
5
Key
This is the TRIGGER key used to manually trigger the HP 4284A
when it is set to the Manual Trigger mo de.
(10) MEMORY Card Slot and UNLOCK Button
The MEMORY card slot is where you insert the memory cards. The
UNLOCK button is used to eject a memory card.
(11)
4
DC BIAS
5
Key
This is
4
DC BIAS
5
used to enable the DC bias output.
4
DC BIAS
5
is a
toggle type switch, and the DC BIAS ON/OFF LED indicator is
lo cated ab ove
4
DC BIAS
5
. When
4
DC BIAS
5
is set to ON, the DC BIAS
ON/OFF LED indicator is ON. When
4
DC BIAS
5
is set to OFF, the
DC BIAS ON/OFF LED indicator is OFF. If
4
DC BIAS
5
is set to OFF,
even though the DC bias is set to ON according to the LCD display,
the DC bias isn't output.
Overview 2-3
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