HP 3457A Service Manual page 83

Operational Verification Tests
2-Wire Ohms Operational Verification Tests Cont'd
R MEAN
R
SDEV R NSAMP
/ mlm
II SENSE I N P U T
lib
I 4 WIRE1 I Z Y l R E l
Figure 4-1 6. 2-Wire Ohms Operational Verification Test Connections
4. If any of the offset readings are beyond the limits specified in Table 4-25 and on the Test Record,
the instrument should be calibrated. Refer t o Section V of this manual for calibration procedures.
5
.
Remove the short from the front panel input terminals.
I
Short
1
3
K o h m
1
OHM
I
0.000207 Kohm
I
0.000207 Kohm
I
1
3457A
1
3 4 / 7 1
1
I
90
d a y
1imitr
I n p u t
Range S e t Up
1
y e a r
Limits
Table 4-25. 2-Wire Ohms Offset Test Limits
S h o r t
S h o r t
4-82. 2-Wire Ohms Function
-
Gain Test
4-83. Equipment Required. Resistance Standards of 3 Kohrns (5 .OOlO!), 30 Kohms
(+
.00I0/o), and
300 Kohms
(+-
.OOlO/o) are required for this procedure.
3 0 Kohm
300 Kohm
1.Set the
HP 3457A t o the 2-wire ohms function (OHM) and the number of digits displayed (DIGITS
DISP) t o 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 to reduce lead resistance).
OHM
OHM
3. Use the Test Record t o record the 3 Kohrn, 30 Kohrn and 300 Kohm full-scale readings.
4. If any of the readings are beyond the limits specified in Table 4-26 and on the Test Record, the in-
strument should be calibrated. Refer to Section
V of this manual for calibration proced~~res.
00.00027 Kohm
000.0010 Kohm
5. Remove the Resistance standard from the HP 3457A front panel input terminals.
0 0 . 0 0 0 2 7 Kohm
0 0 0 . 0 0 1 0 Kohm