2-Wire Ohms Function - HP 3457A Service Manual

Performance Tests
Rear lnput Performance Tests (44492A Multiplex Assy.) Cont'd
3 4 5 7 A 3 4 5 7 A
lnput Range
- I -
3 4 5 7 A
Set
Up
D C V
D C V
D C V
D C V
Table 4-1 9. DC Voltage Offset Test Limits (44492A)
Test Limits
4-61. 2-Wire Ohms Function
-
44492A Offset Test Limits
H i g h
+ 0 0 0 . 0 0 0 7
V
+ 0 0 . 0 0 0 2 0
v
+ 0 . 0 0 0 0 1 0
v
+ 0 0 0 . 0 0 7 0 mV
4-62. Equipment Required. A low thermal (copper) shorting wire is required f o r this procedure.
Low
- 0 0 0 . 0 0 0 7
V
-
0 0 . 0 0 0 2 0
v
- 0 . 0 0 0 0 1 0
v
- 0 0 0 . 0 0 7 0 mV
1. Set the HP 3457A to the 2-Wire Ohms Function, 30 Mohm range, set the offset compensation
(OFFSET COMP) on, and the number of digits displayed (DIGITS DISP) t o six.
2. Close channel 0. (Press the CHAN configuration key, enter the number 0 and press the
ENT key).
3. Use the Test Record t o record the offset readings for the 30 Mohm, 3 Mohm, 300 Kohm, 30 Kohm,
3 Kohm and 300 Ohm ranges.
4. Test the ohms offset on channels 0 through 9 with the instrument set t o the 300 Ohm range.
Record the reading of each channel on the Test Record provided at the end of this section.
5. If any of the offset readings are beyond the limits specified in Table 4-20 and on the Test Record,
the instrument should be calibrated or repaired. Refer t o Section V of this mani~al f o r calibration
procedures.
3 4 5 7 A
1
nput
Short
Short
Short
Short
Short
Short
3 4 5 7 A
Set
Up
3 4 5 7 A
Range
Test Limits
Table 4-20. 2-Wire Ohms Offset Test Limits (44492A)
3 0 0 ohm
3
Kohm
3 0 Kohm
3 0 0
Kohm
3 Mohm
3 0
Mohm
OHM
OHM
OHM
OHM
OHM
OHM
0 0 4 . 2 0 6 5 ohm
0 . 0 0 4 2 1 0
Kohm
0 0 . 0 0 4 3 0 Kohm
0 0 0 . 0 0 5 3
Kohm
0 . 0 0 0 0 2 1 Mohm
0 0 . 0 0 0 8 6 Mohm