HP 3457A Service Manual page 67
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- Service manual (182 pages) ,
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- Service manual (6 pages)
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Performance Tests
4-Wire Ohms Performance Tests Cont'd
4-34. 4-Wire Ohms Function - Offset Test
4-35. Equipment Required. A low thermal short (copper wire) is required for this procedure.
3457A
1. Set the HP 3457A
to the 4-Wire
Ohms
Function
(OHMF)
and
the number
of digits displayed
(DIGITS DISP) to six.
2. Short the front panel input terminals of the HP 3457A as shown in Figure 4-6.
3. Use the Test Record
to record the offset readings of the 30 Ohm, 300 Ohm, 3 Kohm, 30 Kohm,
300 Kohm, 3 Mohm, and 30 Mohm ranges.
4. If any of the offset readings are beyond the
specified in Table 4-9 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V of this manual
for calibration
procedures.
5. Remove the short from the front panel input terminals.
34578
3457A
|3457A | 90 day Limits | 1 year Limits
Input
Range
| Set Up
Short
30 ohm
OHMF | 00.00335 ohm
00.00335 ohm
Short
|300 ohm
OHMF | 000.0035 ohm
000.0035 ohm
Short
3 Kohm | OHMF | 0.000007 Kohm | 0.000007 Kohm
Short
30 Kohm | OHMF | 00.00007 Kohm | 00.00007 Kohm
Short
|300 Kohm | OHMF | 000.0008 Kohm | 000.0008 Kohm
Short
3 Mohm | OHMF | 0.000014 Mohm | 0.000014 Mohm
Short
30 Mohm | OHMF | 00.00083 Mohm | 00.00083 Mohm
Table 4-9. 4-Wire Ohms Offset Test Limits
4-12
Figure 4-7. 4-Wire Ohms Gain Performance Test Connections
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