2-Wire Ohms Function - 44492A Offset Test Limits - HP 3457A Service Manual
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Performance Tests
3457A
Rear Input Performance Tests (44492A Multiplex Assy.) Cont'd
3457A | 3457A | 34578
Test Limits
Input
|Range | Set Up
High
Low
short
|300 v | pcv
+000.0007 v
-000.0007 Vv
Short | 30 v | ocv
+ 00.00020 v
- 00.00020 v
Short
3v | ocv
+
0.000010 v
-
0.000010 v
Short
|300 mv]
pcv
+000.0070 mv
-000.0070 mv
Table 4-19. DC Voltage Offset Test Limits (44492A)
4-61. 2-Wire Ohms Function - 44492A Offset Test Limits
4-62. Equipment Required. A low thermal (copper) shorting wire is required for this procedure.
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) to six.
2. Close channel 0. (Press the CHAN configuration key, enter the number 0 and press the ENT key).
3. Use the Test Record to 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 to 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 to Section V of this manual for calibration
procedures.
3457A
3457A
3457A
Test
limits
Input
Range
| Set Up
Short
300
ohm
OHM
004.2065
ohm
Short
3 Kohm | OHM
0.004210 Kohm
Short
30 Kohm | OHM
00.00430 Kohm
Short
300
Kohm
OHM
000.0053
Kohm
Short
3 Mohm
OHM
0.000021
Mohm
Short
30 Mohm | OHM
00.00086 Mohm
Table 4-20. 2-Wire Ohms Offset Test Limits (44492A)
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