HP 3478A Technical Manual page 40

3478A 3478A
u. u. (Step #23.) Turn Au (Step #23.) Turn Autozero on by
Shift button and then the INT/TRIG (AUTO/ZERO) Shift button and then the INT/TRIG (AUTO/ZERO)
button. button.
v. v. (Step #24. (Step #24.) Set ) Set the 3478A
Check the full scale accuracy by setting the DC Volts Check the full scale accuracy by setting the DC Volts
Standard for Standard for an accurate an accurate output of + 3
record the reading. record the reading.
w. w. (Step (Step #25.) Turn #25.) Turn the DC
Disconnect the DC Volts Standard and Digital Voltmeter Disconnect the DC Volts Standard and Digital Voltmeter
from the 3478A. from the 3478A.
x. x. (Step #26.) (Step #26.) The DC Common Mode The DC Common Mode Rejection Test
is next. is next. Do the Do the following: following:
1. 1. Set the 347 Set the 3478A to the 8A to the 30mV Range.
2. 2. Connect a IK Connect a IK ohm resistor (-hp- Pa ohm resistor (-hp- Part No. 0698-
1021) between the 3478A's HI and LO INPUT Terminals. 1021) between the 3478A's HI and LO INPUT Terminals.
3. 3. Note the Note the 3478A's rea 3478A's reading.
4. 4. With the DC Volts Stan With the DC Volts Standard's output
the standard to the 3478A as shown in the standard to the 3478A as shown in Figure 4-3.
5. 5. Set the DC Volts St Set the DC Volts Standard for an output
and then turn its outp and then turn its output on. ut on. Check and make sure the
3478A's reading is within .O5OmV of the reading noted 3478A's reading is within .O5OmV of the reading noted
in step 3. in step 3.
y. y. Turn the DC Volt Turn the DC Volts Standard's
disconnect it from the disconnect it from the 3478A.
Volts Test. Volts Test. If any te If any test fails, try st fails, try calibrating the instru
(go to (go to paragraph 4-86 paragraph 4-86). ). If the t
VII of this manual for troubleshooting. VII of this manual for troubleshooting.
4-54. 4-54. DC DC Current Current Test Test
4-55. The DC Current 4-55. The DC Current Test limits are print
Current Test Card and in Table 4-4. Current Test Card and in
test card also corresponds to a step in the procedure test card also corresponds to a step in the procedure
with each step number shown in parenthesis in the with each step number shown in parenthesis in the
procedure. procedure.
4-56. Unless otherwise 4-56. Unless otherwise noted, all test
to the 3478A's A (Amps) and LO INPUT Terminals. to the 3478A's A (Amps) and LO INPUT Terminals.
4-57. 4-57. Equipment Required. Equipment Required.
required test equipment for the DC Current Test. required test equipment for the DC
tozero on by pressing the blue pressing the blue
the 3478A to the to the 300V Range. 300V Range.
output of + 300V. 00V. Check and Check and
the DC Standard's Standard's output output off.
Rejection Test
30mV Range.
rt No. 0698-
ding.
dard's output off, connect off, connect
Figure 4-3.
andard for an output of 500V
Check and make sure the
s Standard's output off and t output off and then
3478A. This completes This completes the DC
calibrating the instrument
If the test still fails, go est still fails, go to Section
Test limits are printed on the ed on the DC
Table 4-4. Each step on the Each step on the
noted, all test signals are applied signals are applied
The following is the The following is the
Current Test.
Table 4-4. Table 4-4. DC Current
off.
Digital Voltmeter (-hp- Model 3456A) DC Volts Standard Digital Voltmeter (-hp- Model 3456A) DC Volts Standard
(Systron Donner Model M107) AC-DC Current Calibrator (Systron Donner Model M107) AC-DC Current Calibrator
(Valhalla Model 2500) (Valhalla Model 2500)
4-58. 4-58.
Performance Test has been completed, before doing the Performance Test has been completed, before doing the
DC Current Test. DC Current
of 500V warmed up for at least one hour, then do the following: warmed up for at least one hour, then do the following:
a. a. (Step #1.)
Shift button and then the SGL/TRIG (TEST/RESET) Shift button and then the SGL/TRIG (TEST/RESET)
button. button.
hen
the DC b. b.
ment Function and short the multimeter's A (Amps) Terminal Function and short the multimeter's A (Amps) Terminal
to Section
to the LO INPUT Terminal. to the
be on the 300mA Range. be on the 300mA Range.
c. c. Record the display
make sure the reading is within the limits shown on the make sure the reading is within the limits shown on the
DC Test Card and in Table 4-4. Test Card and in
d. d. (Step
and record the reading. and record the reading.
e. e.
Terminals and set the multimeter to Terminals and set the multimeter to the 300mA Range.
f. f. Set the DC Volts Stan Set the DC Volts Standard for a + IV
g. g. Set the
IV Range, and 6 Digit Display mode. IV Range, and 6 Digit Display mode.
h. h. Set the
Range. Range.
DC Current Test Limits Test Limits
4-7 4-7
Figure 4-3. DC Common Figure 4-3. DC Common Mode Rejection T
Test Procedure. Test Procedure.
Test. Also make sure t Also make sure the 3478A h
(Step #1.) Reset the 3 Reset the 3478A by
(Step #2.) Set (Step # 2.) Set the 347 the 3478A to
LO INPUT Terminal. The instrument
Record the displayed reading on ed reading on the Test Card and
Table 4-4.
(Step #3.) Se #3.) Set the t the 3478A to 3478A to the 3A
(Step #4.) (Step #4.) Remove th Remove the short
dard for a + IV output,
Set the Digital Voltmeter Digital Voltmeter to the
Set the AC-DC Current AC-DC Current Calibrator to
TM 11-6625-3071-14 TM 11-6625-3071-14
Mode Rejection Test est
Make sure the DC Volts Make sure the DC Volts
he 3478A has been as been
478A by pressing the blue pressing the blue
8A to the DC the DC Current Current
The instrument should now should now
the Test Card and
the 3A Range. Range. Check Check
e short from the from the INPUT INPUT
the 300mA Range.
output,
to the DC Volts Funct DC Volts Function,
Calibrator to the 100mA the 100mA
ion,