Frequency Counter Performance Tests - HP 3457A Service Manual

4-Wire Ohms Performance Tests Cont'd
Performance Tests
4-36. 4-Wire Ohms Function
-
Gain Test
4-37. Equipment Required. Resistance Standards of 30
011111s (+
.004°/~), 300 Ohms
(
.002°/0), 3 Kohms
(f
.0010/o) 30 Kohms (+ .OOliYn)), 300 Kohms (+ .OOl(Yn), 3 Mohms (+ .001%) and 30 Mohms (+ .009°/n) are
required f o r this procedure.
1. Set the HP 3457A to the 4-Wire ohms firnction
(OHMF) and the number of digits displayed (DIGITS
DISP) t o six.
2.
Connect the appropriate Resistance Standard to the H P 3457A front panel input terminals as shown
in Figure 4-7.
3. Use the Test Record to record the resistance readings f o r the 30 Ohm, 300 Ohm, 3 Kohm, 30 Kohm,
300 Kohm, 3 Mohm and 30 Mohm ranges.
4. If any of the readings are beyond the limits specified in Table 4-10 and on the Test Record, the in-
strument should be calibrated or repaired. Refer to Section V f o r calibration procedures.
5. Remove the Resistance Standard from the I-IP 3457A front panel input terminals.
3457A
I n p u t
30 ohm
300 ohm
3 Kohm
3 0 Kohm
300 Kohm
3 Mohm
30 Mohm
3457A
Range
30 ohm
300 ohm
3 Kohm
30 Kohm
300 Kohm
3 Mohm
30 Mohm
3457A
S e t
Up
OHMF
OHMF
OHMF
OHMF
OHMF
OHMF
OHMF
29.99440 ohm
299.9800 ohm
2.999843 Kohm
29.99844 Kohm
299.9842 Kohm
2 .' ? i W "i ' l Mohm
29.9871 7 Mohm
90 d a y L i m i t s
30.00530 ohm
300.0170 ohm
3.000112 Kohm
30.00112 Kohm
300.0128 Kohm
3.000179 Mohm
30.00833 Mohm
Frequency Counter Performance Tests
H i g h
1 y e a r L i m i t s
Figure 4-8. Frequency Counter Performance Test Connections
Low H i g h
Table 4-10. 4-Wire Ohms Gain Test Limits
29.99470 ohm
299.9830 ohm
2.999888 Kohm
29.99888 Kohm
299.9872 Kohm
2.999821 Mohm
29.99167 Mohm
I
Low
30.00560 ohm
300.0200 ohm
3.000157 Kohm
30.00157 Kohm
300.0158 Kohm
3.000209 Mohm
30.01283 Mohm
I