4-Wire Ohms Short; Acv Test - HP 3456A Operating And Service Manual

Model 3456A
REfERENCE
Figure 4·6. 4·Wire Ohms Short.
b. Set the 3456A to the 2-Wire ohms function and set
it to the 6 digit mode by storing "6" into the N DIG
DISP register.
c. Record the displayed offset reading on the Test
Card and make sure the reading is within the limits in­
dicated on the card and Table 4-3.
d. Do the same for the 4-Wire ohms function. Leave
the 3456A in that function. If any of the offset tests fail,
refer the 3456A to a service trained person.
e. Connect the 100 ohm resistor to the 3456A's input
terminals. Refer to Figure 4-7 on how to connect the 1 00
ohm and other Standard Resistors to the instrument.
Record and check the reading.
.... IIO
R
�'IIR n SENSE
STMO .... RO
RESISTOR
Figure 4·7. Ohms Tnt
f. Do the same for the I
and I G ohm ranges by connecting the I
1 M, 10 M, and 1000 M ohm resistors to the input ter­
minals, respectively. (The ranges do not need to be
changed since the 3456A is still in Autorange.) I f any of
the previous tests fa il, do the Ohms Adjustment in Sec­
v.
tion
g. Set the 3456A to the 2-Wire ohms function and
I
connect the M ohm resistor to the input terminals.
Check and record the reading.
h. Set the 3456A to the 4-Wire ohms function and to
l OO K
the ohm range. Connect the 10
the input terminals. Check and record the reading.
.... RO
YOL IS
GU
o
VOLTS
REf
"RIl
"RIl
GUMO
IQ]
0
H5�-4-1
K, K, K,
10 100 I M, 10 M,
K, K, lOOK,
10
K
ohm resistor to
i. Turn the 3456A's Autozero "OFF". Check and
record the reading.
j. Set the 3456A to the 2-Wire O.C. ohms function
and turn Autozero "ON". Connect the 100
resistor to the 3456A's input terminals. Check and
record the reading.
k. Set the 3456A to the 4-Wire O.C. ohms function.
Check and record the reading. If any of the previous
tests fail, do the Ohms Adjustment in this Manual's Sec­
v.
tion This completes the Ohms Test.
4-41. ACV Tnt
4-42. Make sure the 3456A has been warmed-up for at
least I hour. Refer to Table 4-4 and/or the ACV Perfor­
mance Test Card for the ACV Test limits.
4-43. Equipment Required.
AC Calibrator (Fluke Model 5200A/5215A)
DC Standard (Systron Donner Model M 107)
4-44. Test Procedure.
a. Press the RESET button on the 3456A.
b. Set the 3456A to the ACV + DCV function and
apply .01 V dc from the DC Standard to the 3456A's in­
put terminals. Record and check the reading. Make sure
the reading is within the limits noted on the Test Card
and Table 4-4.
c. Set the AC Calibrator for a .01 V, 1 kHz output.
Remove the DC Standard from the input terminals and
connect the output of the AC Calibrator to the input
terminals.
d. Set the 3456A to the ACV function and record and
check the reading.
e. Set the AC Calibrator to . 1 V. Record and check
the reading.
f. Do the same for the AC Calibrator's output of
lOD
.5 V, I V, 10 V, V and 700 V.
g. Set the AC Calibrator for a .01 V, 100 kHz output.
Record and check the reading.
h. Do the same for voltage settings of 1 V, 10 V,
100 V, and 700 V.
i. Set the AC Calibrator for a I V, 250 kHz output.
Record and check the reading.
j . Do the same for a 10 V output.
Performance Test
K
ohm
4·9