HP 3457A Service Manual page 58

Performance Tests
DC Voltage Performance Tests Cont'd
3457A
~ n p u t
Short
Short
Short
Short
S h o r t
30
m\
3 0 0
m\
3
v
2
v
1
v
- 1
v
- 2
v
- 3
v
30 V
3 0 0
V
3457A
Range
3 0 0
V
3 0
V
3
v
3 0 0
mV
3 0 mV
3 0
mV
300
mV
3
v
3
v
3
v
3
v
3
v
3
v
30
V
300
V
3457A
Set
Up
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
D C V
90 da
H i g h
+ 0 0 0 . 0 0 0 7
V
+ 0 0 . 0 0 0 2 0
v
+
0 . 0 0 0 0 0 7
V
+ 0 0 0 . 0 0 4 0 mV
+ 00.00385
mV
+ 30.00505 mV
+300.0115
mV
+ 3 . 0 0 0 0 5 8
V
+ 2.000041 V
+ 1 . 0 0 0 0 2 4
V
-
0 . 9 9 9 9 7 6 V
-
1.999959
v
- 2 . 9 9 9 9 4 2
V
+ 30.00125 V
+ 3 0 0 . 0 1 5 7 V
l i m i t s
Low
1
yea
H i g h
+ 0 0 0 . 0 0 0 7
V
+ 0 0 . 0 0 0 2 0
v
+
0 . 0 0 0 0 0 7
V
+ 0 0 0 . 0 0 4 0 mV
+ 00.00385 mV
+ 3 0 . 0 0 5 2 0 mV
+300.0145
mV
+ 3 . 0 0 0 0 8 2
V
+
2 . 0 0 0 0 5 7
V
+ 1 . 0 0 0 0 3 2
V
-
0 . 9 9 9 9 6 8
V
-
1 . 9 9 9 9 4 3
v
- 2 . 9 9 9 9 1 8
V
+
3 0 . 0 0 1 4 0
V
+ 3 0 0 . 0 1 7 2 V
L i m i t s
L o w
Table 4-1. DC Voltage Test Limits
3. Test the H P 3457A input offset o n the 300 V, 30 V, 3 V, 300 mV and 30 mV ranges and record the
reading of each range o n the Test Record provided a t the end of this section. Begin with the 300 V
range t o allow any thermal voltages which might affect the readings o n the lower ranges t o dissipate.
4. If any of the offset readings are beyond the limits specified o n the Test Record, the instri~ment
should be calibrated o r repaired. Refer t o Section V of this manual f o r calibration procedures.
5. Remove the short f r o m 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 m V
(+
.0012%), 1 V, 2 V and 3 V
( +
.0006°/o), 30 V
(f
.OO 13%) and 300 V
(+
.OO 17%) is required f o r this
procedure.
1. Set the output of the DC Voltage Standard t o 30 mV and connect it t o the H P 3457A f r o n t panel
HI
and LO Input Tern~inals. See Figure 4-1.
2.
Use the Test Record t o record the full-scale readings
for
the 30 mV, 300 mV, 3
V, 30
V
and 300 V
ranges. Begin with the 30 mV range.
3. If a n y o f the full-scale readings are beyond the specified limits, refer t o Section V f o r calibration
procedures.
4. Reduce the output of the Voltage Standard t o 3 volts.