2-Wire Ohms Function - HP 3457A Service Manual

Performance Tests
Rear lnput Performance Tests (44491A Relay Assy.) Cont'd
3457A
Set
Up
D C V
D C V
D C V
D C V
D C V
Test
H i g h
i m i
t s
LOW
Table 4-15. DC Voltage Offset Test Limits (44491A)
4-52. 2-Wire Ohms Function
-
44491A Offset Test Limits
4-53. Equipment Required. Low thermal (copper) shorting wires are required for this procedure.
1. Set the HP 3457A t o the 2-Wire Ohms Function, 30 Mohm range. Set the offset compensation
(OFFSET COMP) on, and the number of digits displayed (DIGITS DISP) to six.
2. Close channel 0. (Press the CHAN configuration key, enter the number 0 and press the ENT key).
3. Use the Test Record to record the offset readings for the 30 Mohm, 3 Mohm, 300 Kohm, 30 K o h n ~ ,
3 Kohm, 300 Ohm and 30 Ohm ranges.
4. Test the ohms offset on channels 0 through 7 with the instrument set t o the 30 Ohm range. Record
the reading of each channel on the Test Record provided a t the end of this section.
5. If any of the offset readings are beyond the limits specified in Table 4-16 and on the Test Record,
the instrument should be calibrated or repaired. Refer t o Section V for calibration procedures.
3457A
I
nput
Short
Short
Short
Short
Short
Short
S h o r t
3457A
Range
3 0
ohm
300
ohm
3
Kohm
30 Kohm
300 Kohm
3 Mohm
30 Mohm
3457A
Set
Up
OHM
OHM
OHM
OHM
OHM
OHM
OHM
Test Limits
02.20635 ohm
002.2065 ohm
0 . 0 0 2 2 1 0
Kohm
00.00230 Kohm
0 0 0 . 0 0 3 3 Kohm
0 . 0 0 0 0 1 9 Mohm
00.00086
Mohm
Table 4-16. 2-Wire Ohms Offset Test Limits (44491A)
4-54. 4-Wire Ohms Function
-
44491A Offset Test Limits
4-55. Equipment Required. Low thermal (copper) shorting wires are required for this procedure.
I. Set the HP 3457A t o the 4-Wire Ohms Function (OHMF). Set the offset compensation (OFFSET
COMP) on, and the number of digits displayed (DIGITS DISP) to six.