HP 3478A Technical Manual page 39

3478A 3478A
any readings in this step or step c are out of the specified any readings in this step or step c are out of
limits, go to the DC Volts Calibration Procedure in limits, go to the DC Volts Calibration Procedure in
paragraph 4-86. paragraph 4-86.
e. e. (Step (Step #7 and #7 and 8.) Re 8.) Remove the
3478A's INPUT Terminals and set the multimeter to the 3478A's INPUT Terminals and set the multimeter to the
30mV Range. 30mV Range.
f. f. Set the DC Set the DC Volts Standard for Volts Standard for zero volts outp
the Digital Voltmeter to the DC Volts Function, 6 Digit the Digital Voltmeter to the DC Volts Function, 6 Digit
Display mode, and Autorange. Display mode, and Autorange.
g. g. Connect the 3 Connect the 3478A to the 478A to the Digital Voltmeter and DC
Volts Standard, as shown in Volts Standard, as shown in Figure 4-2.
Voltmeter as the standard and the DC Volts Standard as Voltmeter as the standard and the DC Volts Standard as
the p the power ower supply. supply. An example on An exa
Voltmeter and DC Volts Standard checks the 3478A Voltmeter and DC Volts Standard checks the 3478A
accuracy on the multimeter's 3V Range, is as follows: accuracy on the multimeter's 3V Range, is as follows:
1. 1. Set the 3478A Set the 3478A to the 3V to the 3V Range.
2. 2. Set the DC Volts Stan Set the DC Volts Standard for an outpu
3. 3. Note Note the the reading reading on
reading is not exactly +3V, adjust the DC Volts Standard reading is not exactly +3V, adjust the DC Volts Standard
until the reading is exactly + 3V, as displayed by the until the reading is exactly + 3V, as displayed by the
Digital Digital Voltmeter. Voltmeter. This reading is th This reading
voltage used to check the 3478A reading. voltage used to check the 3478A reading.
4. 4. Make sure the Make sure the 3478A reading is wi 3478A reading is within its specified
limits. Record the limits. Record the reading on the reading on the Test Card.
Always Always uprange uprange
upranging the DC Volts Standard and upranging the DC Volts Standard and
always downrange the DC Volts Standard always downrange the DC Volts Standard
before downranging the 3478A. before downranging the 3478A.
Figure 4-2. Figure 4-2. DC Volts Accur DC Volts Accuracy Test and
h. h. Check Check the the multimeter's multimeter's 30mV
the specified
move the short from short from the
zero volts output. Set
Digital Voltmeter and DC
Figure 4-2. Use the Digital Use the Digital
mple on how th how the Digital e Digital
Range.
dard for an output of +3V. t of +3V.
on the the Digital Digital Voltmeter. Voltmeter. If t
is then t en the st he standard
thin its specified
Test Card.
NOTE NOTE
the the 3478A 3478A before before
acy Test and Calibration Calibration
30mV and and 300mrnV 300mrnV
Ranges full scale accuracy by setting the DC Volts Ranges full scale accuracy by setting the DC Volts
Standard for an accurate output (as displayed on the Standard for an accurate output (as displayed on the
Digital Voltmeter) of 30mV and 300mV, respectively. Digital Voltmeter) of 30mV and 300mV, respectively.
Check the multimeter's readings and make sure they are Check the multimeter's readings and make sure they are
the within the specified limits. within the specified limits.
i. i. (Step #9.) Se (Step #9.) Set the 3478A t
the DC Volts Standard for an accurate output of + the DC Volts Standard for an accurate output of +
ut. Set 300mV. 300mV. Check and r
j. j. (Step (Step #10.)
output. output. Check and rec Check and record the re
k. k. (Step #11.) Apply (Step #11.) Apply -IV to the 3478A b
input leads. (Leave the lea input leads.
step.) Check and record the reading. step.) Check and record the reading.
l. l. (Step #12. (Step #12.) Set
output (-3 output (-3V input t
reading. reading.
m. m. (Step #13.) (Step #13.) Apply + 3V
the input leads. s. (Leave the lead the input lead
If the he steps that follow.) Check and steps that follow.) Check and record the reading.
n. n. (Step #14. (Step #14.) With + 3V applied
andard Autozero off by pressing the blue Shift button and then Autozero off by pressing the blue Shift button and then
the the INT/TRIG INT/TRIG (AUTO/ZERO)
the reading. the reading.
o. o. (Step #15.) Turn (Step #15.) Turn Autozero on
Shift button and then the INT/TRIG (AUTO/ZERO) Shift button and then the INT/TRIG (AUTO/ZERO)
button. button.
p. p. (Step #16.) (Step #16.) With + 3V applied t
the multimeter's 4 Digit Display mode by pressing the the multimeter's 4 Digit Display mode by pressing the
blue Shift button and then the Uprange (4) button. Check blue Shift button and then the Uprange (4) button. Check
and record the reading. and record the reading.
q. q. (Step #17.) Se (Step #17.) Select the 3478A's 3 Dig
by pressing the blue Shift button and then the by pressing the blue Shift button and then the
AUTO/MAN (3) button. AUTO/MAN (3) butt
r. r. (Step #18.) (Step #18.) Select the 3478
by pressing the blue Shift button and then the by pressing the blue Shift button and then the
Downrange (5) button. Downrange (5) button.
s. s. (Step #19, (Step #19, 20, and 21.
Range. Check the multimeter' Range.
accuracy by setting the DC Volts Standard for accurate accuracy by setting the DC Volts Standard for accurate
outputs of of +3V, outputs
and record th and record the readings.
3478A. 3478A.
t. t. (Step #22. (Step #22.) With + 30V applied
Autozero off by pressing the blue Shift button and then Autozero off by pressing the blue Shift button and then
the IN the INT/TRIG (AUTO/ZERO) bu T/TRIG (AUTO/ZERO) button.
the reading. the reading.
4-6 4-6
t the 3478A to the 3V Rang o the 3V Range and set
Check and record the r ecord the reading. eading.
#10.) Set Set the the DC DC Volts Volts Standard
ord the reading. ading.
-IV to the 3478A by reversing th
(Leave the leads in that po ds in that position for the next
) Set the DC V the DC Volts Standard
V input to the 34 o the 3478A). 78A). Check and record t
Apply + 3V to the 347 to the 3478A by rev
(Leave the leads in that positio s in that position for the
record the reading.
) With + 3V applied to the 347
(AUTO/ZERO) button. button. Check
Autozero on by pressing the blu
With + 3V applied to the 3478
lect the 3478A's 3 Digit Display mode
on. Check and record t Check and record the reading.
Select the 3478A's 5 Digit Display A's 5 Digit Display mode
20, and 21.) Set the 34 ) Set the 3478A to the 3
Check the multimeter's 1/10, s 1/10, 1/3, and full scale
+3V, + + 10V, 10V, and and +30V, +30V, respectively.
e readings. Leave + 30V connected Leave + 30V connected' to the
) With + 30V applied to the 3478A
tton. Check and'
TM 11-6625-3071-14 TM 11-6625-3071-14
e and set
Standard for for a a + + IV IV
y reversing the e
sition for the next
olts Standard for a 3V for a 3V
Check and record the he
8A by reversing ersing
n for the
to the 3478A, turn 8A, turn
Check and and record record
by pressing the blue e
o the 3478A, select A, select
it Display mode
he reading.
mode
78A to the 30V 0V
1/3, and full scale
respectively. Check Check
' to the
to the 3478A, turn , turn
Check and' record record