Tests; Dc Voltage Function - HP 3457A Service Manual

Operational Verification Tests
DC Voltage Operational Verification Tests Cont'd
2. Set the HP 3457A to the DC Voltage fiunction (DCV) and the number of digits displayed (DIGITS
DISP) to six.
3. Test the HP 3457A input offset on the 30 V, 3 V, and 300 mV ranges and record the reading of
each range on the Test Record provided at the end of this section. Begin with the 30 V range t o allow
any thermal voltages which might affect the readings on the lower ranges to dissipate.
4. If any of the offset readings are beyond the limits specified in Table 4-21 and on the Test Record,
the instrument shoi~ld be calibrated. Refer to Section V of this manual for calibration procedures.
5. Remove the shost from the Front Panel Input Terminals.
4-68. DC Voltage Function
-
Gain Test
4-69. Equipment Required. A set of low thermal cables and a DC Voltage Standard capable of providing
300 mV
(?I
. O O 12%), 3 V
(f
.0006°/o) and 30 V
(f
.OO 13%) is required for this test.
1. Set the output of the DC Voltage Standard to 300 mV and connect it to the HP 3457A front panel
HI and LO
Input Terminals.
2. Use the Test Record t o record the full-scale readings for the 300 mV, 3 V, and 30 V ranges. Begin
with the 30 V range.
3. If any of the full-scale readings are beyond the limits specified in Table 4-21 and on the Test
Record, the instrument should be calibrated. Refer t o Section V of this manual f o r calibration
procedures.
4. Reduce the output of the Voltage Standard to 0 volts and disconnect it from the HP 3457A.
3457A
Input
S h o r t
S h o r t
S h o r t
300
mV
3
v
30
V
3457A
Range
3457A
S e t Up
D C V
D C V
D C V
D C V
D C V
D C V
90
d a y L i m i t s
Table
4-21. DC
Voltage Test Limits
+ 00.00020
V
+
0.000007
V
+000.0040
mV
+300.0115
mV
+ 3.000058
V
+
30.00125
V
1 y e a r
L i m i t s
H i g h
H i g h Low
- 00.00020
V
-
0.000007
V
-000.0040
mV
+299.9885
mV
+ 2.999942
V
+
29.99875
V
Low
+
00.00020
V
+
0.000007
V
+000.0040
mV
+300.0145
mV
+ 3.000082
V
+
30.00140
V
- 00.00020
V
-
0.000007
V
- 0 0 0 . 0 0 4 0
mV
+299.9855
mV
+
2.999918
V
+
29.99860
V