Dc Current Function - Of; Dc Current Function - HP 3457A Service Manual

Performance Tests 3457A
DC Current Performance Tests Cont'd
3457A |3457A | 3457A 90 day limits 1 year limits
Input Range |Set Up High Low High Low
Open | 300 uA] DCI +000.0104 uA -000.0104 uA +000.0104 uA -000.0104 uA
Open 3 mA} DCI +0.000104 mA -0.000104 mA +0.000104 ma -0.000104 mA
Open 30 mA} DCI +00.00104 mA -00.00104 ma +00.00104 mA -00.00104 mA
Open |300 mA] OCI +000.0204 ma -000.0204 ma +000.0204 mA -000.0204 ma
Open 1A ocl +0.000604 A -0.000604 A +0.000604 A -0.000604 A
300 uA}]300 uA} DCI 300.0704 uA 299.9296 uA 300.1304 uA 299.8696 uA
3 mA 3 mA} DCI 3.000704 ma 2.999296 mA 3.001304 mA 2.998696 mA
30 mA| 30 mA| DCI 30.00704 mA 29.99296 mA 30.01304 mA 29.98696 mA
300 mA|300 mA} DCI 300.2304 mA 299.7696 mA 300.2604 mA 299.7396 mA
1A 1A ocl 1.001304 A 0.998696 A 1.001304 A 0.998696 A
Table 4-5. DC Current Offset and Gain Test Limits
4-24, DC Current Function - Offset Test
4-25. 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 4-5 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V of this manual for calibration
procedures.
4-26. DC Current Function - Gain Test
4-27. Equipment Required. A DC Current Source capable of providing currents of 300 uA, 3 mA, 30 mA
(+ 007%), 300 mA (+ .026%), and 1 A (+ .04%) is required for the following procedure.
4-8
1. Set the DC Current Source to 300 uA and connect it to the HP 3457A front panel I and LO input
terminals.
2. Set the HP 3457A to the 300 uA range and the number of digits displayed (DIGITS DISP) to six.
3. Use the Test Record to record the full-scale current readings for the 300 uA, 3 mA, 30 mA, 300 mA
and | A ranges.
4. If any of the full-scale readings are beyond the limits specified in Table 4-5 and on the Test
Record, the instrument should be calibrated or repaired. Refer to Section V of this manual for
calibration procedures.
5. Reduce the output of the DC Current Source and disconnect it from the HP 3457A input terminals.