Current Measurements - HP 3457A Service Manual
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- Service manual (273 pages)
Table of Contents
Operation
3457A
3-22. Integration Time.
The Integration time can be changed to reduce measurement noise or to permit
faster readings. The integration time is dependent upon the power line frequency and is expressed in num-
ber of power line cycles (NPLC). There are six integration times available; 100 PLC, 10 PLC, 1 PLC, .I PLC,
.005 PLC and .0005 PLC. The greater the PLC number, the qi~ieter and more accirrate the reading will be
and the slower the measurement speed.
T o select the Integration Time
-
Press the
NPLC
/
A
configuration key. Use the
?/AUTO
or
HOLD
scroll key to display the desired number and press the
ENT
/
LAST ENTRY
key.
The Integration Time can illso be clttctrged By prosing the
NPLCIA
k c y , entering tire desired nurrrber directly rtsirrg tire
M A T H kegs and pressing the
ENTILAST ENTRY
key.
3-23. lnput Connections.
For 2-Wire Ohms measurements, the unknown resistance is connected t o the
INPUT HI
and
LO
terminals. This applies t o both front and rear terminal operation. When using one of the
optional Plug-In assemblies, the input would be connected to the
HI
and LO inputs of a particular- channel.
For 4-Wire Ohms measurements, the irnknown resistance is connected to the
INPUT HI
and
LO
terminals
and t o the
S2
SENSE HI
and
LO
terniinals as shown in Figure 3-1. When using the HP 44491A General
Purpose Multiplexer assembly, the i~nknown resistance is connected as shown in Figure 3-2.
I
Figure 3-1. Front Panel Connections
Figure 3-2. Plug-In Connections
3-24. FrontIRear lnput Selection. The lnpi~t configurations are Front Terminals. Rear Tern~inals/Scanner
or Open.
only
one i&ut configuration (front, rear, scanner or open) can be selected at a time.
T o select Input configuration
-
Press
the TERM
/
M
configuration Ley.
Use
the
AUTO
or
HOLD
scroll key t o display the desired input and press the
ENT
/
LAST ENTRY
key.
The input can also be changed by pressing t h ~
TERM/M
k e y , entering tltc czppropric~te ntttrtber using thc AlA1.H kegs urrd
pressing the
ENTILAST
ENTRY k e y .
3-25. Current Measurements (Manual Operation)
3-26.
Function Selection.
The measurement function is selected by pressing the appropsiate function key.
The current measirrement fimctions available are DC Current, AC Current and DC Coupled AC Current.
T o select DC Current
-
Press the
DCI
function key.
T o select AC Current
-
Press the
ACI
/
ACDCl
function key.
T o select DC coupled AC Current
-
Press the Blue
SHIFT
key then the
ACI
/
ACDCl
function key.
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