HP 3457A Service Manual page 66

B457A 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%), 300 Ohms ( .02%), 3 Kohms (+ .003%)
30 Kohms (+ 001%), 300 Kohms (+ 001%) 3 Mohms (+ .001%), and 30 Mohms (+ .009%) are required for
this procedure.
LSet the HP 3457A to the 2-wire ohms function (OHM) and the number of digits displayed (DIGITS
DISP) to six.
2. Connect the Resistance Standard to the HP 3457A front panel HI and LO input terminals. (The
connecting wires should be as short as possible to reduce lead resistance).
3. Use the Test Record to 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 to Section V for calibration procedures.
5. Remove the Resistance standard from the HP 3457A front panel input terminals.
34570 3457A | 34578 90 day limits 1 year Limits
Input Range | Set Up High Low High Low
30 ohm 30 ohm OHM 30.20530 ohm 29.79470 ohm 30.20560 ohm 29.7954400hm
300 ohm | 300 ohm | OHM 300.2170 ohm 299.7830 ohm 300.2200 ohm 299.7800 ohm
3 Kohm 3 Kohm| OHM 3.000312 Kohm 2.999688 Kohm 3.000357 Kohm 2.999643 Kohm
30 Kohm}| 30 Kohm| OKM 30.00132 Kohm 29.99868 Kohm 30.00177 Kohm 29.99823 Kohm
300 Kohm| 300 Kohm| OKM 300.0130 Kohm 299.9870 Kohm 300.0160 Kohm 299.9840 Kohm
3 Mohm 3 Mohm| OHM 3.000179 Mohm 2.999821 Mohm 3.000209 Mohm 2.999791 Mohm
30 Mohm}| 30 Mohm| OKM 30.00833 Mohm 29.99167 Mohm 30.01283 Mohm 29.98717 Mohm
Table 4-8. 2-Wire Ohms Gain Test Limits
4-Wire Ohms Performance Tests
@ SENSE INPUT
tevin, a vie.
HATH
RECALL STORE) _ sno
AEAN oR SOEV RNSAMP | ERROR
CLEAR
CJ C4) Ge)
TAST
cont FuLteR | _ entry
Figure 4-6. 4-Wire Ohms Offset Performance Test Connections