HP 3457A Service Manual page 46

Opera l i o n 3457A
A C B A N D W I D T H ( A C B A N D )
......................
SLOW
A U T O - R A N G E ( A R A N G E )
..........................
ON
A U T O - Z E R O
....................................
ON
B E E P
.........................................
ON
C H A N N E L S C O N N E C T E D ( C H A N )
..................
NONE
D E L A Y
...
D E F A U L T
(Minimum required f o r accuracy)
D I G I T S D I S P L A Y E D ( N D I G )
.......................
5
D I S P L A Y ( D I S P )
...............................
ON
E M A S K
.............................
32767
enabled
E R R O R R E G I S T E R
.............
R e s u l t s
o f
Self-Test
F I X E D I M P E D A N C E ( F I X E D Z )
....................
O F F
F R E Q U E N C Y SOURCE ( F S O U R C E )
.............
A C V O L T S
F U N C T I O N ( F U N C )
........................
D C V O L T S
H P - I D A D D R E S S
. . . .
U N C H A N G E D
(Factory s e t t i n g
2 2 )
I N P U T BUFFER ( I N B U F )
........................
O F F
I N P U T T E R M I N A L S ( T E R M )
....................
F R O N T
I N T E G R A T I O N T I M E ( N P L C )
..................
10
P L C
M A T H F O R M A T ( M F O R M A T )
.....................
S R E A L
M A T H F U N C T I O N ( M A T H )
...................
O F F , O F F
M A T H R E G I S T E R S
.
A l l
C l e a ~ e d Except the f o l l o w i n g
......................................
D E G R E E
20
.......................................
O F F S E T
0
...........................
R E F E R E N C E dB ( R E F ) 1
.........................................
R E S
5 0
........................................
S C A L E
1
................................
MEMORY ( M E M ) O F F
............
M E M O R Y S I Z E ( M S I Z E )
Previous S e t t i n g
........
NUMBER OF R E A D I N G S PER T R I G G E R ( N R D G S )
1
.................
O F F S E T C O M P E N S A T I O N ( O C O M P )
O F F
...................
OUTPUT F O R M A T ( O F O R M A T ) A S C I I
............................
P R O G R A M MEMORY C L E A R
............................
R E A D I N G MEMORY C L E A R
....
R E Q U E S T S E R V I C E ( R Q S ) Power ON
b i t unchanged
........................
S C A N A D V A N C E ( S A D V ) HOLD
.....................
S C A N L I S T ( S L I S T ) C H A N N E L 0
S T A T U S R E G I S T E R
..
Pwr
ON
b i t
+
S e l f - T e s t r e s u l t s
....................................
T I M E R 1 S E C .
.............................
T R I G G E R ( T R I G ) AUTO
.........................
T R I G G E R A R M ( T A R M )
A U T O
Table 3-1. 3457A Power-On State
3-13.
Range Selection. T h e H P 3457A Auto-Range feature a i ~ t o ~ i i a t i c a l l y selects the appropriate range t o
measure the voltage applied. T h e Auto-Range feature is disabled by selecting M a n u a l Ranging. There are
5
voltage nieasurement ranges available; 30
mV,
300 m V , 3
V,
30
V
and 300
V.
'The default range is
Auto-Range.
T o select M a n u a l Ranging and maintain the present range
-
Press the Bluc SHIFT hey then the
J/HOLD
scroll key.
T o select M a n ~ ~ a l Ranging and the next higher range -
Press the ?/AUTO scroll key
T o select Manual Ranging and the next lower range
-
Press the J/HOLD scroll key
T o r e t u r n t o Auto-Ranging
-
Press the Blue SHIFT hey then the ?/AUTO scroll key.
3-1
4. Measurement Resolution. Measurement Resolution is changed by selecting the number o f digits dis-
played. Y o u can choose a display o f 3 1/2,
4
1/2, 5 1/2 o r
6
1/2 digits. T h e 1/2 digit refers t o t h e most sig-
nificant digit w h i c h is limited t o a value o f 0,
1, 2,
o r
3.
T h e default nuniber o f digits displayed is 5 1/2
(most significant digit p l i ~ s 5 digits).
T o change the number o f digits displayed
-
Press the DIGITS DISP
/
P
c o n f i g i ~ r a t i o n key, enter the
number
3, 4, 5
o r
6
and press the ENT
/
LAST ENTRY key.
3-15.
Integration Time. T h e Integration time can be changed t o reduce measurement noise o r t o p e r m i t
faster readings. T h e integration time is dependent upon tlie power line frequency and is expressed i n n u m -
ber o f p o w e r line cycles (NPLC). There are six integration times available; 100 PLC, 10 PLC,
I
PLC,
.I
PLC,
,005 P L C and .0005 PLC. T h e greater the P L C number, the quieter and m o r e accurate the reading w i l l be
and tlie slower the measurement speed.