Gain Test . 4-1; 4-Wire Ohms Performance Tests - HP 3457A Service Manual

Performance Tests
2-Wire Ohms Performance Tests Cont'd
4-32. 2-Wire Ohms Function
-
Gain Test
4-33. Equipment Required. Resistance Standards of 30 Ohms (+ .2%0), 300 Ohms ( .02%), 3 Kohms (+ .003%)
30 Kohms (+ .001%), 300 Kohms
(f
.OOlo/o) 3 Mohms (+ .00lo/o), and 30 Mohms
(f
.OO99' o ) are required f o r
this procedure.
1.Set the I-IP 3457A to the 2-wire ohms function (OHM) and the numbcr of digits displayed (DIGITS
DISP) to six.
2. Connect the Resistance Standard t o the HP 3457A front panel HI and LO input terminals. (The
connecting wires should be as short as possible t o reduce lead resistance).
3. Use the Test Record t o record the 30 Ohm, 300 Ohm, 3 Kohm, 30 Kohm, 300 Kohm, 3 Mohm and
30 Mohm readings.
4. If any of the readings are beyond the limits specified in Table 4-8 and on the Test Record, the in-
strument should be calibrated or repaired. Refer t o Section V f o r calibration procedures.
5. Remove the Resistance standard from the HP 3457A front panel input terminals.
3457A
I npu t
3457A
Range
30 ohm
300 ohm
3 Kohm
30 Kohm
300 Kohm
3 Mohm
30 Mohm
OHM
O H M
O H M
O H M
O H M
O H M
O H M
3457A
Set
Up
30 ohm
300 ohm
3 Kohm
30 Kohm
300 Kohm
3 Mohm
30 Mohm
30.20530 ohm
300.2170 ohm
3.000312 Kohm
30.00132 Kohm
300.0130 Kohm
3.000179 Mohm
30.00833 Mohm
90 d a y L i m i t s
H i g h
I
LOW
29.79470 ohm
299.7830 ohm
2.999688 Kohm
29.99868 Kohm
299.9870 Kohm
2.999821 Mohm
29.99167 Mohm
1 yea1
H i g h
30.20560 ohm
300.2200 ohm
3.000357 Kohm
30.00177 Kohm
300.0160 Kohm
3.000209 Mohm
30.01283 Mohm
Table 4-8. 2-Wire Ohms Gain Test Limits
L i m i t s
Low
29.795440ohm
299.7800 ohm
2.999643 Kohm
29.99823 Kohm
299.9840 Kohm
2.999791 Mohm
29.9871 7 Mohm
4-Wire Ohms Performance Tests
R MEAN R SDEV R NSAHP
l o
mlm
Figure 4-6. 4-Wire Ohms Offset Performance Test Connections