HP 3478A Technical Manual page 44

3478A 3478A
10 ohm 10 ohm .0005%; (Guideline Model 9330/10 or .0005%; (Guideline Model 9330/10 or
± ±
9330//10) 9330//10)
100 ohm 100 ohm .0005%; (Guildline Model 9330/100 or .0005%; (Guildline Model 9330/100 or
± ±
330A/100) 330A/100)
1K ohm 1K ohm .0005%; (Guildline Model 9330/IK or .0005%; (Guildline Model 9330/IK or
± ±
9330A/ 1K) 9330A/ 1K)
10K ohm 10K ohm .001%; (Guildline Model 9330/10K or .001%; (Guildline Model 9330/10K or
± ±
9330A/IK) 9330A/IK)
100K ohm 100K ohm .001%; (Guildline Model 9330/lOO1K or .001%; (Guildline Model 9330/lOO1K or
± ±
9330A/100K) 9330A/100K)
1M ohm 1M ohm .002%; (Guildline Model 9330/IM) .002%; (Guildline Model
± ±
10M ohm 10M ohm .01%; (Guildline Model 9330/IOM) .01%; (Guildline Model
± ±
4-75. 4-75. Test Procedure. Test Procedure.
Volts Tests have been done, before doing the Ohms Volts Tests have been done, before doing the Ohms
Test. Also make sure Test. Also make sure the 3478A
for at least one hour, then do the following: for at least one hour, then do the following:
a. a. (Step #1.) (Step #1.) Reset the Reset the 3478A by
Shift button and then the SGL/TRIG (TEST/RESET) Shift button and then the SGL/TRIG (TEST/RESET)
button. button.
b. b. (Step #2.) Set (Step #2 .) Set the 34 the 3478A to
Function (see Function (see paragraph 4-70). paragraph 4-70).
Function is to be tested, short the HI and LO INPUT Function is to be tested, short the HI and LO INPUT
Terminals. Terminals. If the If the 4-Wire'Ohms Function 4-Wire'Ohms Function is to
short the SENSE Terminals and the INPUT Terminals, short the SENSE Terminals and the INPUT Terminals,
as shown in Figure 4-6. as shown in Figure 4-6.
3478A's display and record the reading on the Test Card. 3478A's display and record the reading on the Test Card.
Figure 4-6. Figure 4-6. 4-Wire Ohm
c. c. (Step #3, 4, (Step #3, 4, 5, 6, 7, and 8.) Set 5, 6, 7, and 8.) Set the 3478A to the
3001, 3K1], 3Knl, 300Knl, 3Mn, and 30M1l Range by 3001, 3K1], 3Knl, 300Knl, 3Mn, and 30M1l Range by
pressing the Uprange button once for each range. pressing the Uprange button once for each range.
Record and make sure the reading on each range are Record and make sure the reading on each range are
within the specified within t he specified limits. limits. If any
and step b are out of the specified limits, go to the Ohms and step b are out of the specified limits, go to the Ohms
Calibration Procedure in Calibration Procedure in paragraph 4-103.
d. d. (step #9.) Remove (step #9 .) Remove the short
INPUT Terminals and set the multimeter to the 300 INPUT Terminals and set the multimeter to the 300
Range. Range.
e. e. Connect either Connect either a 3012 or 10 a 3012 or 101f Standard Resist
the INPUT Terminals (refer to paragraph 4-71 the INPUT Terminals (refer to
9330/IM)
9330/IOM)
Make sure the 3478A's DC Make sure the 3478A's DC
the 3478A has been w has been warmed up
3478A by pressing the blue pressing the blue
78A to the desired the desired Ohms
If If the the 2-Wire 2-Wire Ohms
is to be tested, be tested,
Check the reading on the Check the reading on the
4-Wire Ohms Short s Short
the 3478A to the
If any readings in readings in this step
paragraph 4-103.
the short from the from the 3478A's
1f Standard Resistor to
paragraph 4-71 to to
determine determine the resist
tested in the 2-Wire Ohms Function, connect the resistor tested in the 2-Wire Ohms Function, connect the resistor
to the to the HI and LO INPUT Terminals.
done in the 4-Wire Ohms Function, connect the resistor done in the 4-Wire Ohms Function, connect the resistor
as shown in Figure 4-7. as shown in
armed up
Ohms
Ohms
f. f. Check and Check and record t
g. g. (Step #10
3K 3K , 30K , 30K
Ω Ω
connecting the following standard resistors to the connecting the following standard resistors to the
multimeter's input: 300 multimeter's input: 300
30K 30K
Ω Ω
and 30M and 30M
the readings. the readings.
h. h. Remove the
This completes the Ohms This completes
calibrating the instrument (go to paragraph 4-103) calibrating the instrument (go to
test still fails, go to this manual's Section VII for test still fails, go to this manual's Section VII for
troubleshooting. troubleshooting.
4-76. 4-76.
PERFORMANCE TESTS PERFORMANCE TESTS
4-77. General 4-77. General
4-78. 4-78.
Combined Calibration Procedures and Performance Combined Calibration Procedures and Performance
Tests. The Performance Tests are included in the Tests. The Performance Tests are included in the
procedures since they are normally performed after procedures since they are normally performed after
calibration. The procedures calibration.
that the Performance Tests can be ignored, if so desired. that the Performance Tests can be ignored,
this step
4-79. Since the 34 4-79.
multimeter is calibrat multimeter
calibration source is applied to the 3478A's INPUT calibration source is applied to the 3478A's INPUT
3478A's
Terminals which is used to calibrat Terminals which is use
readings are then taken and the entered value of the readings are then taken and the entered value of the
calibration source is compared with the average value of calibration source is compared with the average value of
the ten the ten readings.
or to
4-11 4-11
the resistor value). or value).
HI and LO INPUT Terminals. If the test
Figure 4-7.
Figure 4-7. 4-Wire Ohm Figure 4-7. 4-Wire Ohms Connection
record the reading. he reading.
(Step #10 through 15. through 15.) Check the 3478 ) Check the 3478A's 30012,
, 300K , 300K , , 3M 3M
Ω Ω Ω Ω Ω Ω
(or 100 (or 100
Ω Ω
) (or 10K ) (or 10K ), 300K ), 300K (or 100K (or 100K
Ω Ω Ω Ω
(or 10M (or 10M ), ), respectively. respectively. Check a
Ω Ω Ω Ω
Remove the Standard Standard Resistors from
the Ohms Test. Test.
COMBINED COMBINED
The The following following paragraphs paragraphs have
The procedures are set
Since the 3478A has no inter 78A has no internal adjustments, the
is calibrated elect ed electronically.
d to calibrate the multimeter.
readings. A Calibration A Calibration Con-
TM 11-6625-3071-14 TM 11-6625-3071-14
If the 3478A is If the 3478A is to be to be
If the test is to be is to be
s Connection
A's 30012,
, and 30M , and 30M Ranges by Ranges by
Ω Ω
), 3K ), 3K (or 1K (or 1K
Ω Ω Ω Ω
), 3M ), 3M (or 1M (or 1M
Ω Ω Ω Ω
Check and nd record record
Resistors from the 3478A. the 3478A.
If any If any test fails, test fails, try
paragraph 4-103). . If If the
CALIBRATION CALIBRATION AND AND
have the the 3478A's 3478A's
are set up in su up in such a w ch a way
if so desired.
nal adjustments, the
ronically. A known A known good good
e the multimeter. Ten
Con-
), ),
Ω Ω
), ),
Ω Ω
try
the
ay
Ten