HP 3478A Technical Manual page 47

3478A 3478A
4-89. Calibration 4-89. Calibration and and Test Pro
been warmed up for at least one hour, do the following: been warmed up for at least one hour, do the following:
a. a. Reset the Reset the 3478A by 3478A by pressing the blue S
and then the SGL/TRIG (TEST/RESET) button. and then the SGL/TRIG
Resetting the 3478A automatically places the Resetting the 3478A automatically places the
instrument instrument into into
Autorange, Internal Trigger, and 5 Digits Autorange, Internal Trigger, and 5 Digits
Display mode. Display mode.
b. b. Using a Using a small flat blade small flat blade screwdriver, set
panel CAL ENABLE Switch to the calibration enable panel CAL ENABLE Switch to the calibration enable
position (the slot of the switch is in the vertical position, position (the slot of the switch is in the vertical position,
as shown on the front panel). as shown on the front panel).
c. c. Set the Set the multimeter to multimeter to the Single
pressing the SGL/TRIG button. pressing the SGL/TRIG button.
d. d. (Step #1. (Step #1.) Short ) Short the 3478A'
Terminals. Set the inst Terminals. Set the instrument to the
out of Autorange). out of Autorange).
e. e. Press the Press the blue Shift bu blue Shift button and
(CAL) button. (CAL) button.
f. f. Press the Press the SGL/TRIG (Single SGL/TRIG (Single Trigger) butto
once and then remove the short from the Input once and then remove the short from the Input
Terminals. Terminals.
g. g. Set the DC Volts Stan Set the DC Volts Standard for zero vo
h. h. (Step (Step #2.) #2.) Connect Connect the 34
Voltmeter and DC Volts Standard, as shown in Figure 4- Voltmeter and DC Volts Standard, as shown in Figure 4-
2. 2. Use the Digital Voltmeter Use the Digital Voltmeter as the standard and th
Volts Standard as a stable power supply. Volts Standard as a stable power supply.
i. i. Set the DC Set the DC Volts Standard Volts Standard's output
note the reading on the Digital Voltmeter. note the reading on the Digital Voltmeter.
j. j. Press Press the the blue blue Shift Shift button
(CAL) button. (CAL) button.
k. k. Using the Using t he 3478A's 3478A's Uprange
buttons, adjust the reading on the multimeter until it buttons, adjust the reading on the multimeter until it
agrees with the reading on the Digital Voltmeter. agrees with the reading on the Digital Voltmeter.
l. l. Press the Press the SGL/TRIG (Single Trigg SGL/TRIG (Single Trigger) button
m. (Step #3 and m. (Step #3 and 4.) Remove the Digital Volt 4.) Remove the Digital Voltmeter and
the DC the DC Volts St Volts Standard andard from the
3478A's HI and LO INPUT Terminals and set the 3478A's HI and LO INPUT Terminals and set the
instrument to the 300mV Range. instrument to the 300mV Range.
n. n. Calibrate the Calibrate the 300mV Range (app 300mV Range (applying z
scale inputs) by using the procedure in steps e to 1. The scale inputs) by using the procedure in steps e to 1. The
only exception is that the DC Volts Standard is set for an only exception is that the DC Volts Standard is set for an
Test Procedure. cedure. After After the
pressing the blue Shift button hift button
(TEST/RESET) button.
NOTE NOTE
the the DC DC Volts Volts Function, Function,
screwdriver, set the front
the Single Trigger Mode Trigger Mode by
the 3478A's HI and s HI and LO INPUT LO INPUT
rument to the 30mV Range (take 30mV Range (take
tton and then the then the LOCAL
Trigger) button only
dard for zero volts output. lts output.
the 3478A to 78A to the the Digital
as the standard and the DC
's output for + 30mV and for + 30mV and
button and and then then the the LOCAL
Uprange and/or and/or Downrange Downrange
er) button once.
meter and
from the 3478A. 3478A.
lying zero and full ero and full
the has has output (in step i) of + 300mV instead of + 30mV. output (in step i) of + 300mV instead of + 30mV.
o. o. (Step #5 an
the DC Volts the DC Volts Standard
3478A's HI and LO INPUT Terminals and set the 3478A's HI and LO INPUT Terminals and set the
instrument to the 3V Range. instrument to the 3V Range.
p. p. Calibrate the 3V
inputs) by inputs) by using the pr
exception is that the DC Volts Standard is set for an exception is that the DC Volts Standard is set for an
output (in step i) of + 3V instead of + 30mV. output (in step i) of + 3V instead of +
q. q. If no performance checks for t
the front made, remove the DC Volts Standard and Digital made, remove the DC Volts Standard and Digital
Voltmeter from the 3478A. Voltmeter from
r. r. If the pe If the performance checks for th
be made, do the following: be made, do the following:
by
1. 1. Set the 347
pressing the INT/TRIG button. pressing the INT/TRIG button.
2. 2. (Step #7.)
300mV output. 300mV output.
LOCAL 3. 3.
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
n only
4. 4. (Step #8.)
output. output. Check t
5. 5. (Step #9.) A
the input leads. the input
Digital the next step.) Check the reading on the multimeter the next step.) Check the reading on the multimeter
(per Table 4-8) (per
e DC
6. 6. (Step #10.) Apply
DC Volts Standard for DC Volts Standard for a 3V output.
7. 7. (Step #11.)
the input the input leads.
LOCAL
8. 8. With + 3V applied
off by off
INT/TRIG (AUTO/ZERO) INT/TRIG (AUTO/ZERO) button.
9. 9. (Step #12.
blue blue
once. (AUTO/ZERO) button. (AUTO/ZERO) button.
10. (Step #13 10.
Short the Short the multimeter's 4 Digit Display mode by pressing the blue multimeter's 4 Digit Display mode by pressing the blue
Shift butto Shift button and then
the reading. the reading.
11. (Step #14.) 11.
by pressing the blue Shift button and by pressing the blue Shift button and
4-14 4-14
(Step #5 and 6.) Remove d 6.) Remove the Digital Vo
Standard from the from the 3478A.
Calibrate the 3V Range (apply Range (applying zero and
using the procedure in steps ocedure in steps e to 1.
If no performance checks for the 3V range are
the 3478A. Continue with step s. Continue with step s.
rformance checks for the 3V Range
Set the 3478A to the 8A to the Internal Trigger M
(Step #7.) Set the D Set the DC Volts Stand
Using the Digital Volt Using the Digital Voltmeter as
Table 4-8.
(Step #8.) Set the Set the DC Volts Standard DC Volts Standard for a + IV
Check the rea he reading. ding.
(Step #9.) Apply -IV pply -IV to the 3478A by
leads. (Leave the (Leave the leads in that
Table 4-8). .
(Step #10.) Apply -3V to the 3478A by sett -3V to the 3478A by setting the
a 3V output. Check the reading.
(Step #11.) Apply +3V Apply +3V to the 3478A by
leads. Check the Check the reading.
With + 3V applied to the to the 3478A, turn
by pressing pressing the the blue blue Shift Shift button
button. Check the re
(Step #12.) Turn Autoz ) Turn Autozero on by
Shift Shift button button and and
(Step #13.) With +3V .) With +3V still applied,
n and then the Uprange the Uprange (4) button.
(Step #14.) Select the Select the 3478A's 3
TM 11-6625-3071-14 TM 11-6625-3071-14
the Digital Voltmeter and ltmeter and
3478A. Short the Short
ing zero and full scale full scale
e to 1. The only The only
30mV.
he 3V range are to be to be
e 3V Range are to are to
Internal Trigger Mode by ode by
C Volts Standard for a + ard for a +
meter as the st the standard, andard,
for a + IV
to the 3478A by reversing reversing
leads in that position for position for
ing the
Check the reading.
to the 3478A by reversing reversing
reading.
3478A, turn Autozero Autozero
button and and then then
Check the reading. ading.
ero on by pressing the pressing the
then then the the INT/TRIG INT/TRIG
still applied, select the select the
(4) button. Check Check
3478A's 3 Digit Display Digit Display
the
the the