HP 3478A Technical Manual page 48

3478A 3478A
then the AUTO/MAN (3) button. then the AUTO/MAN
12. (Step #15.) 12. (Step #15.) Select the Select the 3478A's 5
by pressing the blue Shift button and then the by pressing the blue Shift button and then the
Downrange (5) button. Downrange (5) button.
13. 13. Remove t Remove the DC he DC Volts Stan
Voltmeter from the 3478A and set the multimeter back Voltmeter from the 3478A and set the multimeter back
to the Single Trigger mode (press the SGL/TRIG to the Single Trigger mode (press the SGL/TRIG
button). button).
s. s. (Step #15 (Step #15 and 16.) Sho and 16.) Short the 3478
INPUT Terminals. Set the instrument INPUT Terminals. Set the instrument to the 30V Range.
t. t. Calibrate the 30V Calibrate the 30V Range (apply
scale inputs) by using the procedur scale inputs) by using the procedure in steps e to 1.
only exception is that the DC Volts Standard is set for an only exception is that the DC Volts Standard is set for an
output (in step i) of + 30V instead of + 30mV. output (in step i) of + 30V instead of
u. u. If no perfor If no performance checks for the mance checks for the 30V range are to
be made, remove the DC Volts Standard and Digital be made, remove the DC Volts Standard and Digital
Voltmeter from Voltmeter from the 3478A. the 3478A. Continue with step w.
v. v. If the per If the performance checks for the formance checks for the 30V Range
are to be made, do the following: are to be made, do the following:
1. 1. Set the 34 Set the 3478A to the 78A to the Internal Trigger
pressing the INT/TRIG button. pressing the INT/TRIG button.
2. 2. (Step #17.) Se (Step #17.) Set the DC Volts Standard for a + 3 t the DC Volts Standard for a + 3V V
output. output.
3. 3. Using th Using the Digital e Digital Voltmeter
check and make sure the 3478A reading is within the check and make sure the 3478A reading is within the
specified limits shown in Table 4-8. specified limits shown in
4. 4. (Step #18.) (Step #18.) Set the DC Set the DC Volts Standard
IOV output. IOV output. Check the reading on Check the reading on the multimeter.
5. 5. (Step #19.) (Step #19.) Set the DC Set the DC Volts Standard
30V output. 30V output.
6. 6. With + 30V applied With + 30V applied to the 3478
off by pressing the blue Shift button and then the off by pressing the blue Shift button and then the
INT/TRIG (AUTO/ZERO) button. Check and make INT/TRIG (AUTO/ZERO) button. Check and make
sure the reading is within 11 counts of the + 30V sure the reading is within 11 counts of the + 30V
calibration source. calibration source.
7. 7. (Step #20 (Step #20.) Turn Autoz .) Turn Autozero on by
blue blue Shift Shift button button
(AUTO/ZERO) button. (AUTO/ZERO) button.
8. 8. Remove Remove the the DC
Voltmeter from the 3478A and set the multimeter back Voltmeter from the 3478A and set the multimeter back
to the Single Trigger Mode (press the SGL/TRIG to the Single Trigger Mode (press the SGL/TRIG
button). button).
w. w. (Step #20 and 21 (Step #20 and 21.) Short the 3478 .) Short the 3478A's HI and LOW
INPUT INPUT Terminals. Terminals. Set the Set
(3) button. Check the reading. Check the reading.
3478A's 5 Digit Display Digit Display
Volts Standard and dard and Digital
rt the 3478A's HI and LO A's HI and LO
to the 30V Range.
Range (applying zero ing zero and full
e in steps e to 1. The
+ 30mV.
30V range are to
Continue with step w.
30V Range
Internal Trigger Mode by
Voltmeter as the as the standard,
Table 4-8.
Volts Standard for a +
the multimeter.
Volts Standard for a +
to the 3478A, turn Autoz A, turn Autozero
ero on by pressing the pressing the
and and then then the the INT/TRIG INT/TRIG
DC Volts St Volts Standard andard and Digita and Digital l
A's HI and LOW
the instrument instrument to to the the 300V
Range. Range.
x. x. Calibrate t
scale inputs) by scale inputs) by using the proced
only exception is that the DC Volts Standard is set for an only exception is that the DC Volts Standard is set for an
output (in step i) of + 300V instead of + output (in step i) of + 300V instead of + 30mV.
Digital
y. y. If no
made, turn the output of the DC Volts Standard off and made, turn the output of the DC Volts Standard off and
remove it and the Digital Voltmeter from the 3478A. remove it and the Digital Voltmeter from the 3478A.
z. z. If the
made, do the following: made, do the following:
and full 1. 1. Set the 347
The
2. 2. Connect a 1K
1021) between the 3478A's HI and LO INPUT 1021) between the 3478A's HI and LO INPUT
Terminals. Terminals.
3. 3. Note the
4. 4. With the DC Volts St
the standard to the 3478A as shown in Figure 4-3. the standard to the 3478A as shown in
5. 5. Set the
Mode by then tu then turn its
3478A's reading is within .05OmV of the reading noted 3478A's reading is within .05OmV of the reading noted
in step 3. in step 3.
6. 6. Turn the DC Volts St
disconnect it from the 3478 disconnect it
standard, Volts Test Volts Test (and Calibra
Section VII of this manual for troubleshooting. Section VII of this
for a + 4-90. DC Current 4-90.
4-91. 4-91.
for a + (paragraph 4-86) (paragraph 4-86) has been done before doing the DC
Current Calibration Current
DC Current Calibration Signals, Performance Test DC Current Calibration Signals, Performance Test
ero Signals, and Performance Test Limits. Signals, and P
table is shown in par table is
Signals are applied to the 3478A's A (Amps) and LO Signals are applied to the 3478A's A (Amps) and LO
INPUT Terminals. INPUT Terminals.
300V
4-15 4-15
Calibrate the 300V he 300V Range (apply Range (applying zero
using the procedure in steps e to
If no DC Common Mod DC Common Mode Rejection Test is
If the DC Common Mo DC Common Mode Rejection Test
Set the 3478A to the 8A to the 30mV Range.
Connect a 1K ohm resistor (-hp ohm resistor (-hp- Part No. 069
Note the 3478A's read 3478A's reading.
With the DC Volts Standard's out andard's output off, connect
Set the DC Volts Standar DC Volts Standard for 500V outpu
rn its output output on. on. Check and make Check and make sure the
Turn the DC Volts Standard's output andard's output off and then
from the 3478A. A. This completes the
(and Calibration). tion). If any
manual for troubleshooting.
DC Current Calibration and Calibration and Test
Make sure the DC Make sure the DC Volts Calibrat
has been done before doing the DC
Calibration and Test. and Test. Refer to
erformance Test Limits. Each step in
shown in parenthesis in t enthesis in the procedure.
Table 4-9. DC Current Calibra Table 4-9. DC Current Calibration and Test
TM 11-6625-3071-14 TM 11-6625-3071-14
ing zero and full and full
ure in steps e to I. I. The
30mV.
e Rejection Test is to be to be
de Rejection Test is to be is to be
30mV Range.
- Part No. 0698- 8-
ing.
put off, connect
Figure 4-3.
d for 500V output and t and
sure the
off and then
This completes the DC
If any test fails, test fails, go to go to
Test
Volts Calibration and ion and Test Test
Refer to Table 4-9 Table 4-9 for the for the
Each step in the
he procedure. All test All test
tion and Test
The
DC
the