HP 3457A - 4-54. 4-Wire Ohms Function - 44491 A Offset Test Limits; 4-56. DC Current Function - 44491 A Offset Test Limits

3B457A
Performance Tests
Rear Input Performance Tests (44491A Relay Assy.) Cont’d
2. Close channel 10. (Press the CHAN configuration key, enter the number 10 and press the ENT key).
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 limits specified in Table 4-17 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures,
34578 3457A | 34578 Test Limits
Input Range | Set Up
Short 30 ohm OHMF | 00.00635 ohm
Short |300 ohm oHMF | 000.0065 ohm
Short 3 Kohm | OHMF | 0.000010 Kohm
Short 30 Kohm OHMF 00.00010 Kohm
Short |300 Kohm | OHMF | 000.0011 Kohm
Short 3 Mohm | OHMF | 0.000017 Mohm
Short 30 Mohm | OHMF | 00.00086 Mohn
Table 4-17. 4-Wire Ohms Offset Test Limits (44491A)
4-56. DC Current Function - 44491A Offset Test Limits
4-57. Equipment Required. This procedure does not require any test equipment.
1.
Set
the
HP
3457A
to
the
DC
Current
function
(DCI),
300
uA
range,
and
the
number
of
digits
dis-
played
(DIGITS
DISP)
to
six.
2.
Use
the Test
Record
to
record
the
current
offset
readings
on
the
300 uA,
3
mA,
30
mA,
300
mA
and
| A
ranges.
3. If any of the offset readings are beyond the limits specified in Table 4-18 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
3457A |3457A | 3457A Test Limits
Input |Range |Set Up High Low
Open |300 ua] ocr +000.0104 uA -000.0104 uA
Open 3 mA} DCI +0.000104 mA -0.000104 mA
open | 30 ma| oci +00.00104 mA -00.00104 ma
Open |300 mA] DCI +000.0204 mA -000.0204 mA
Open 1A | pcr +0.000604 A 0.000604 A
Table 4-18. DC Current Offset Test Limits (44491A)
4-19