Dc Volts Offset Calibration - HP 3457A Service Manual

Calibration
c. Remove the Wiring Block from the Strain Relief Housing (Figure 5-3, Step 3).
d. Install a copper shorting wire between the H and L inputs of channel 0. Tighten the t w o retaining
screws. (Refer t o Figure 5-5 for wire connection).
e. Connect the prepared Wiring Block Assembly to the MP 44492A 10 Channel Multiplexer Assembly.
5-65. DC Volts Offset Calibration
-
HP 44492A
a. Select the DC Voltage function.
(Prrss the DCV function key).
b. Select the Scanner Input.
(Press the T E R M cortfiguration key, enter the nurnber 2 and press the E N T key).
C.
Select channel 0.
(Press the C H A N configurution key, enter the number 0 and press the E N T key).
d. Use the following procedure t o calibrate the DC offset on the 300 V, 30 V, 3 V, 300 mV and
30 mV ranges beginning with the 300 V range.
1. Set the 3457A t o the appropriate range.
(Use the
or
5.
scroll keys t o select the proper range).
2. Access the Calibration Command.
(Press the Blue S I f I F T key, then the OFFSET C O M P
/
C corrfigura-
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 sccurity feature has not been disabled (set t o
0 ) , i t will be necessary t o enter the input value, the delimiter
(
,
)
and the sccurity code).
4. Press the ENT key. The display will show CALIBRATING while the calibration routine is
running.
e. Repeat steps
"
d l
" through " d4
"
f o r each of the remaining ranges.
5-64. Two-Wire Ohms Offset Calibration
-
HP 44492A
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 rrunrber 0 and press the EN7' key).
c. Use the following procedure t o calibrate the 2-wire ohm offset on the 30 Mohm, 3 Mohm,
300 Kohm, 30 Kohm, 3 Kohm and 300 Ohm ranges beginning with the 30 Mohm range.
1. Set the 3457A t o the appropriate resistance range.
(Use the or
4
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 con-
figuration 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 feature has not been disabled (set
t o 0 ) ,
it
will be necessary t o enter the input due, the delimiter (
,
) and tho sccurity 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.