Dc Current Offset Calibration - HP 3457A Service Manual

e. Repeat steps
"
d l
" through
"
d4
"
f o r each of the remaining ranges.
Calibration
5-59. Two-Wire Ohms Offset Calibration
-
HP 44491A
a. Select the 2-Wire Ohms function.
(Press the O H M function key).
b. Close channel 0.
(Press the C H A N configuration key, enter the number 0 urd press the E N T key).
c. Use the following procedure to calibrate the 2-wire ohm offset o n the 30 Mohm, 3 Mohm,
300 Kohm, 30 Kohm, 3 Kohm, 300 Ohm and 30 Ohm ranges beginning with the 30 Mohm range.
1. Set the 3457A t o the appropriate resistance range.
(Use the
or
1
scroll keys t o select the proper
range).
2. Access the Calibration Command.
(Press the Blue S H I F T key, then the OFFSET C O M P
/
C configura-
tion key).
The display will show
CAL.
3. Enter the value of the input
-
in this case
0.
( N O T E : I f the security feuture hus not been disabled (set t o
0 ) , i t will be necessary t o enter the irput value, the delirrtiter (
,
) and the security code).
4. Press the
ENT
key. The display will show
CALIBRATING
while the calibration routine is
running.
d. Repeat steps
" c l
"
through
"
c4
"
for each of the remaining ranges.
5-60. Four-Wire Ohms Offset Calibration
-
HP 44491A
a. Select the 4-Wire Ohms function.
(Press the Blue S H I F T key then the O H M
/
OH M F function key).
b. Close channel 10.
(Press the CHAN configuration key, enter the number I 0 and press the E N T key).
c. Use the following procedure t o calibrate the 4-Wire ohm offset on the 30 Mohm, 3 Mohm,
300 Kohm, 30 Kohm, 3 Kohm, 300 Ohm and 30 Ohm ranges beginning with the 30 Mohm range.
1. Set the 3457A t o the appropriate resistance range.
(Use the
7
or
5
scroll keys t o select the proper
range).
2. Access the Calibration Command.
(Press the Blue S H I F T key, then the 0FFSI:'T COMI'
/
C coafigura-
tion
key).
The display will show CAL.
3. Enter the value of the input
-
in this case
0.
(NOTE: I f the security feature has not been disabled (set t o
0 ) ,
it
wilt be necessary t o enter the input value, the delimiter (
,
) and the security code).
4. Press the ENT key. The display will show CALIBRATING while the calibration routine is
running.
d. Repeat steps
It
c l through
"
c4
"
for each of the remaining ranges.
5-61. DC Current Offset Calibration
-
HP 44491A
a. Select the DC Current function.
(Press the V C I function key.)
b. Select the Scanner Input.
(Press the T E R M configuration key, enter the nuntber 2, and press the E N T key.)