Comment
Description
You can enter a comment using the numeric entry keys (
4
0
5
to
4
9
5
,
4
-
5
(minus),
4
.
5
(p erio d)) on the comment line eld. This comment line is
stored to the internal non-volatile memory or to the external memory
card with the HP 4284A control settings. Also this comment line is
loaded from the internal non-volatile memory or from the external
memory card with the control settings. A comment can be up to 30
characters long.
Note
When you wanttoenter the ASCII characters on the comment line,
only the
DISPlay:LINE
HP-IB command must b e sent via HP-IB.
Front Panel Operation for Entering a Comment Number
Perform the following steps to enter a comment.
1. Move the cursor to the comment line eld.
2. Enter the comment using the numeric entry keys, then press
4
ENTER
5
.
Trigger Mode
Description
The HP 4284A has four trigger mo des: INT
ernal, EXTernal,
MANual, and BUS.
When the trigger mo de is set to INT trigger mo de, the HP 4284A
continuously rep eats measurements on any display page under
4
DISPLAYFORMAT
5
.
When the trigger mo de is set to MAN trigger mo de, the HP 4284A
performs a single measurementonany display page under
4
DISPLAYFORMAT
5
every time
4
TRIGGER
5
on the front panel is pressed.
When the trigger mo de is set to EXT trigger mo de, the HP 4284A
performs a single measurementonany display page under
4
DISPLAYFORMAT
5
every time a p ositive going TTL pulse is applied to
the EXT TRIGGER connector on the rear panel. External triggering
can b e also b e achieved by momentarily switching the center
conductor of the EXT TRIGGER connector to chassis ground (center
conductor circuit contains a pull-up resistor). Figure 4-3 shows the
required TTL pulse.
4-4 MEAS SETUP Menu
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