HP 3457A Service Manual page 71

Performance Tests
Rear Input Performance Tests (Standard Instrument) Cont'd
2. Use the Test Record to record the offset readings for the 30 Ohm, 300 Ohm, 3 ICohn~, 30 Kohm,
300 Kohm, 3 Mohm and 30 Mohm ranges.
3. If any of the offset readings are beyond the limits specified in Table 4-13 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V f o r calibration procedures.
3457A
I 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
S e t Up
1 y e a r L i m i t s
O H M
O H M
O H M
O H M
O H M
OHM
O H M
00.20335 ohm
000.2035 ohm
0.000207 Kohm
00.00027 Kohm
000.0010 Kohm
0.000014 Mohm
00.00083 Mohm
00.20335 ohm
000.2035 ohm
0.000207 Kohm
00.00027 Kohm
000.0010 Kohm
0.000014 Mohm
00.00083 Mohm
Table 4-1 3. 2-Wire Ohms Offset Test Limits (Rear Terminals)
4-47. 4-Wire Ohms Function
-
Offset Test
4-48. Equipment Required. A low thermal short (copper wire) is required for this procedure.
1. Set the HP
3457A t o the 4-Wire Ohms Function (OHMF) and the number of digits displayed
(DIGITS DISP) to six.
2.
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.
3. If any of the offset readings are beyond the limits specified in Table 4-14 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
3457A
I 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
3457A
Set Up
OHMF
OHMF
OHMF
OHMF
OHMF
OHMF
OHMF
90 d a y L i m i t s
00.00335 ohm
000.0035 ohm
0.000007 Kohm
00.00007 Kohm
000.0008 Kohm
0.000014 Mohm
00.00083 Mohm
1 y e a r l i m i t s
00.00335 ohm
000.0035 ohm
0.000007 Kohm
00.00007 Kohm
000.0008 Kohm
0.000014 Mohm
00.00083 Mohm
Table 4-14. 4-Wire Ohms Offset Test Limits (Rear Terminals)