HP 4284A - Page 76

2. Set the dc bias to your desired bias using either the softkeys or
the numeric entry keys. When the dc bias is entered using the
numeric entry keys, the softkey lab els are changed to the available
units (
NNNNNNNN
mV ,
NNNNN
V ,
NNNNNNNN
 A ,
NNNNNNNN
mA , and
NNNNN
A ), and so you can use these softkeys
instead of 4
ENTER
5 . When 4
ENTER
5 is used, the numeric data is
entered with V or A as the default unit.
Note
When you wantto change the DC bias from voltage to currentor
from currenttovoltage, you must use the numeric entry keys and the
units' softkeys.
3. Set 4
DC BIAS
5 on the front panel to ON to output the dc bias.
Integration Time
Description
The HP 4284A's measurement time is determined by the following.
Integration Time (A/D conversion)
Averaging Rate (number of measurementaveraged)
Delay Time (time delaybetween the trigger and the start of the
measurement)
Measurement result's display time
On this page, only the Integration Time in the above items can b e
set, the other settings except for the measurement result's display
time can be set from the MEAS SETUP page.
The HP 4284A uses an integrating A/D converter in the internal
circuits to convert the analog signal to a digital signal. The
Integration Time is the time required to perform an A/D con
version.
Generally, a longer conversion time will result in more stable and
accurate measurement results. SHORT, MEDIUM, or LONG
integration times can be selected. The measurement time of each
integration time is shown in \Measurement Time" in Chapter 9.
Front Panel Operation for Setting the Integration Time
Perform the following steps to set the integration time.
1. Move the cursor to the INTEG eld. The following softkeys will
be displayed.
NNNNNNNNNNNNNNNNN
SHORT
NNNNNNNNNNN
MED
NNNNNNNNNNNNNN
LONG
2. Use the preceding softkeys to select and set the integration time.
DISPLAYFORMAT Menu 3-17