HP 3457A Service Manual page 58
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3457A
Performance Tests
DC Voltage Performance Tests Cont'd
3457A | 3457A | 34578
90 day limits
1 year Limits
Input
|Range | Set Up
High
Low
High
Low
short
|300 v | pcv
+000.0007 v
-000.0007 Vv
+000.0007 V
-000.0007 v
short | 30 v | ocv
+ 00.00020 v
- 00.00020 v
+ 00.0020 v
- 00.00020 v
Short
3V
DcV
+
0.000007
v
0.000007
v
+
0.000007
Vv
-
0.000007
Vv
Short
|300
mv]
DCV
+000.0040
mv
-000.0040
mv
+000.0040
mv
-000.0040
mv
short | 30 mv]
ocv
+ 00.00385 mv
00.00385 mv
+ 00.00385 my
- 00,00385 mv
30
mv|
30
mV}
DCV
+ 30.00505
mv
+
29.99495
mv
+
30.00520
mv
+
29.99480
mV
300
mv}
300
mv}
DCV
+300.0115
mv
+299.9885
mV
+300.0145
mv
+299.9855
mv
3v]
3v | vev
+ 3.000058 v
+ 2.999942 V
+ 3.000082 v
+
2.999918 Vv
2v]
3v | ocv
+ 2,000041 v
+
1.999959 v
+ 2.000057 v
+
1.999943 Vv
lv
3
pDcv
+
1,000024
Vv
+
0.999976
V
+
1.000032
Vv
+
0.999968
V
"av
3
DCV
0.999976
V
1.000024
Vv
0.999968
V
1.000032
v
-2v}
3v | oev
1.999959 V
-
2.000041 v
1.999943 V
2.000057 v
"3
oe
pcv
2.999942
V
3.000058
Vv
2.999918
V
3.000082
V
30
Vv
30
Vv
DCV
+
30.00125
Vv
+
29.99875
V
+
30.00140
v
+
29.99860
V
300 v
|300 v | pcv
+300.0157 V
+299.9843 V
+300.0172 V
+299.9828 V
Table 4-1. DC Voltage Test Limits
3. Test the HP 3457A input offset on the 300 V, 30 V, 3 V, 300 mV and 30 mV ranges and record the
reading of each range on the Test Record
provided at the end of this section. Begin with the 300 V
range to 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 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.
4-16. DC Voltage Function - Gain Test
4-17.
Equipment
Required.
A
DC
Voltage
Standard
capable
of providing
30 mV
(+ .0055%),
300 mV
(+ .0012%),
1 V,
2V and
3 V (+ .0006%),
30 V (+ .0013%)
and
300 V (+ .0017%)
is required
for
this
procedure.
1, Set the output of the DC Voltage Standard to 30 mV and connect it to the HP 3457A front panel
HI and LO Input Terminals. See Figure 4-1.
3. If any of the full-scale readings are beyond the specified limits, refer to Section V for calibration
procedures.
4, Reduce the output of the Voltage Standard to 3 volts.
4-3
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