HP 3457A - 4-52. 2-Wire Ohms Function - 44491 A Offset Test Limits

Performance
Tests
3457A
Rear Input Performance Tests (44491A Relay Assy.) Cont'd
3457A |3457A | 34578 Test Limits
Input |Range | Set Up High Low
Short |300 v | ocv +000.0007 v -000.0007 v
Short | 30 v | ocv + 00.00020 v - 00.00020 v
Short 3 v | ocv + 0.000010 v 0.000010 v
Short |300 mv| cv +000.0070 mv -000.0070 mv
Short | 30 mv] ocv + 00.00685 mv 00.00685 mv
Table 4-15. DC Voltage Offset Test Limits (44491A)
4-52. 2-Wire Ohms Function - 44491A Offset Test Limits
4-53. Equipment Required. Low thermal (copper) shorting wires are required for this procedure.
1.
Set
the
HP
3457A
to
the
2-Wire
Ohms
Function,
30
Mohm
range.
Set
the
offset
compensation
(OFFSET
COMP)
on, and
the
number
of
digits
displayed
(DIGITS
DISP)
to
six.
2. Close channel 0. (Press the CHAN configuration key, enter the number 0 and press the ENT key).
3. Use the Test Record to record the offset readings for the 30 Mohm, 3 Mohm, 300 Kohm, 30 Kohm,
3 Kohm, 300 Ohm and 30 Ohm ranges.
4.
Test
the
ohms
offset
on
channels
0
through
7
with
the
instrument
set
to
the
30
Ohm
range.
Record
®
the
reading
of
each
channel
on
the
Test
Record
provided
at
the
end
of
this
section.
5. If any of the offset readings are beyond the limits specified in Table 4-16 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
34570 3457A 34578 Test Limits
Input Range |Set Up
Short 30 ohm OHM 02.20635 ohm
Short 300 ohm OHM 002.2065 ohm
Short 3 Kohm OHM 0.002210 Kohm
Short 30 Kohm OHM 00.00230 Kohm
Short |300 Kohm | OHM 000.0033 Kohm
Short 3 Mohm OHM 0.000019 Mohm
Short 30 Mohm OHM 00.00086 Mohm
Table 4-16. 2-Wire Ohms Offset Test Limits (44491A)
4-54. 4-Wire Ohms Function - 44491A Offset Test Limits
4-55. Equipment Required. Low thermal (copper) shorting wires are required for this procedure.
1. Set the HP 3457A to the 4-Wire Ohms Function (OHMF). Set the offset compensation (OFFSET
COMP)
on,
and
the
number
of
digits
displayed
(DIGITS
DISP)
to
six.
@