Calibration Procedures; Wiring Block Preparation - HP 3457A Service Manual

Calibration 3457A
c. Use the following procedures to calibrate the DC Current offset on the 300 uA, 3 mA, 30 mA,
300 mA and 3 A ranges beginning with the 3 A range.
1. Set the 3457A to the appropriate current range.
(Use the
or
4
scroll key t o select the proper runge.)
2. Access the Calibration Command.
(Prcss thc Bluc S H I F T key, thcn the OFFSET COA4P
/
C configura-
tion key.)
The display will show CAL.
3. Enter the value of the input
-
in this case 0.
(NOTE: If the security feature has not beeu disabled (set t o
0),
i t will be necessary t o enter the input vuluc, the delimiter (
,
) and thc sccurity code.)
4. Press the ENT key. The display will show CALIBRATING while the calibration routine is
running.
e. Repeat steps
"
c l
"
through
" c4
"
for each of the remaining ranges.
5-62. CALIBRATION PROCEDURES
-
HP 44492A 10 CHANNEL MULTIPLEXER ASSEMBLY
5-63. Wiring Block Preparation
5-64. It will be necessary t o connect a shorting wire to the Plug-ln Assembly Wiring Block before calibra-
tion can be performed. The following procedure outlines the wiring block preparation.
T h i ~ proccdlrrr
~ J J W ~ ~ J
that the Wiring Block
i . 5
ncw and ha3 no wire3 conncctcd to
it. If the Wiring Block is connected to an external device, hazardoirs voltages may
he expowd when thc Strain R&//Wiring Block A ,rvmhly i , rcmoved.
\
4 4 4 9 2 A RELAY
SHORTING WIRE
Figure 5-5. 44492A Wiring Block Connections
a. Remove the two screws attaching the Strain Relief/Wiring Block Assembly to the rear panel and dis-
connect it from the instrument. (Refer to Figure 5-3, Step 1).
b. Remove the Strain Relief Plate from the bottom of the Strain Relief Assembly (Figure 5-3, Step 2).