Gain Test - HP 3457A Service Manual

Operational Verification Tests
DC Current Operational Verification Tests Cont'd
3457A
I n p u t
Open
Open
3 m A
3 0 0 m A
Table 4-24. DC Current Test Limits
4-74. DC Current Function
-
Offset Test
3457A
Range
3 m A
1 A
3 m A
1 A
90 day L i m i t s
4-75. Equipment Required. This procedure does not require any test equipment.
3457A
Set Up
DCI
DCI
DCI
O C I
H i g h
+0.000104 m A
+00.00604 r n A
3.000704 m A
0.300814 A
- -
1
y e a r L i m i t s
I. Set the HP 3457A to the DC Current function (DCI), 3 mA range, and the number of digits dis-
played (DIGITS DISP) to six.
Low
-0.000104 m A
-00.00604 m A
2.999296 m A
0.299186
A
H i g h
+0.000104 m A
+00.00604 m A
3.001304 m A
0.300844 A
2. Use the Test Record t o record the current offset readings on the
3
mA and 1 A ranges.
Low
-0.000104 m A
-00.00604 m A
2.998696 m A
0.299156
A
3. If either of the offset readings are beyond the limits specified in Table 4-24 and on the Test
Record, the instrument should be calibrated or repaired. Refer to Section V for calibration
procedures.
4-76. DC Current Function
-
Gain Test
4-77. Equipment Required. A DC Current Source capable of providing currents of 3 mA and 300 mA
(5
.007%) is required for the following procedure.
1. Set the
DC
Current Source for an output of 0 mA and connect it t o the HP 3457A front panel
I
and
LO
input terminals.
2. Set the HP 3457A to the 3 mA range and the number of digits displayed
(DIGITS DISP)
to six. Set
the DC Current Source t o
3
mA.
3. Use the Test Record to record the 3 mA full-scale current reading.
4. Set the HP 3457A to the I A range and set the DC Current Source for an output of 300 mA
5. Use the Test Record t o record the 300 mA reading.
6.
If either of the readings are beyond the limits specified in Table 4-24 and on the Test Record, the
instrument shoitld be calibrated or repaired. Refer to Section
V for calibration procedures.
7. Set the output of the DC Current Source t o 0 and disconnect it from the HP 3457A input
terminals.