HP 3457A Service Manual page 131

3457A Calibration
b. Select the rear input terminals.
(Press the T E R M configuration key, enter the number 2 and press the E N T
key
).
c. Select the DC Voltage function.
(Press the DCV function key).
d. Use the following procedure t o calibrate the rear terminal 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 voltage range.
(Use the
7
or
scroll key t o select the proper voltage
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 srcnrity feature has not been disabled (set t o
0), I t will 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.
e. Repeat steps
"
d l
I'
through
"
d4
"
for each of the remaining voltage ranges.
5-49. Two-Wire Ohms Offset Calibration
-
Rear Terminals (Standard Instrument)
5-50. Equipment Required. A low thermal short is required for this procedure.
a. Short the
n
SENSE HI and LO and INPUT HI and LO rear input terminals together.
b. Select the rear input terminals.
(Press the TERM configuration key, enter the number 2 and press the E N T
key ).
c. Select the 2-Wire Ohms function.
(Press the O H M function key).
d. Use the following procedure t o calibrate the rear terminal 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.
I. Set the 3457A t o the appropriate resistance range.
(Use the
t
or
4
scroll key 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 configuru-
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 will 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.
e. Repeat steps
"
d l
"
through
"
d4
" for each of the remaining ranges.