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Dc Current Function - HP 3457A Service Manual

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Table of Contents
Performance Tests
Rear lnput Performance Tests (44491A Relay Assy.) Cont'd
2. Close channel 10. (Press the
CHAN
configuration key, enter the n~rmber 10 and press the
ENT
key).
3. Use the Test Record t o record the offset readings of the 30 Ohm, 300 Ohm, 3 Kohm, 30 Kohm,
300 Kohm, 3 Mohm, and 30 Mohm ranges.
4. If any of the offset readings are beyond the limits specified in Table 4-1 7 and o n the Test Record,
the instrument shoirld be calibrated or repaired. Refer to Section V for calibration procedures.
1
n p u t
S h o r t
S h o r t
S h o r t
S h o r t
S h o r t
S h o r t
S h o r t
3457A
Range
30 ohm
300 ohm
3 Kohm
30 Kohm
300 Kohm
3 Mohm
30 Mohm
OHMF
OHMF
OHMF
OHMF
OHMF
OHMF
OHMF
3457A
Set
Up
00.00635 ohm
000.0065 ohm
0.000010 Kohm
00.00010 Kohm
000.0011 Kohm
0.000017 Mohm
00.00086 Mohm
T e s t L i m i t s
Table 4-17. 4-Wire Ohms Offset Test Limits (44491A)
4-56. DC Current Function
-
44491A Offset Test Limits
4-57. Equipment Required.
This procedure does not require any test equipment.
1. Set the HP
3457A t o the DC Current function (DCI), 300 LIA range, and the number of digits dis-
played
(DIGITS DISP)
t o six.
2. Use the Test Record to record the current offset readings on the 300 uA, 3 mA, 30 mA, 300 mA
and 1 A ranges.
3. If any of the offset readings are beyond the limits specified in Table 4-18 and on the Test Record.
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
l n p u t
Range
Open
300 uA
H-
3457A
Set Up
Open
Open
Open
Open
T e s t L i m i t s
H i g h
I
Low
3 m A
30 m A
300 m A
1 A
Table 4-18. DC Current Offset Test Limits (44491A)
DCI
DCI
DCI
DCI
DC
I
+000.0104 uA
+0.000104 m A
+00.00104 m A
+000.0204 m A
+0.000604 A
-000.0104 uA
-0.000104 m A
-00.00104 m A
-000.0204 m A
-0.000604 A
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