HP 3478A Technical Manual page 38

3478A 3478A
4-47. PERFORMANCE 4-47. PERFORMANCE TEST
4-48. 4-48. The Performance The Performance Test is sepa
tests: DC Volts, DC Current, AC Volts, AC Current, and tests: DC Volts, DC Current, AC Volts, AC Current, and
Ohms. Ohms. Each step in Each step in the tests the tests and the test
should be done in the order they are given, starting with should be done in the order they are given, starting with
the DC Volts Test. the DC Volts Test. Allow at least a Allow at least a 1 hour warm-up time.
If the 3478A has been on for less time, inaccuracies can If the 3478A has been on for less time, inaccuracies can
result. result. The Pe The Performance rformance Test is
following tests. following tests.
a. a. DC Volts DC Volts Test - Test - paragraph 4-49. paragraph 4-49.
b. b. DC Current DC Current Test - Test - paragraph 4-54. paragraph 4-54.
c. c. AC Volts AC Volts Test - Test - paragraph 4-59. paragraph 4-59.
d. d. AC Current AC Current Test - Test - paragraph 4-64. paragraph 4-64.
e. e. Ohms Ohms Test Test - paragraph 4-69. - paragraph 4-69.
Leakage paths on the 3478A 's front panel Leakage paths on the 3478A 's front panel
area surrounding the input terminals can area surrounding the input terminals can
affect the instrument's input impedance. affect the instrument's input impedance.
The paths can be removed by using a soft The paths can be removed by using a soft
cotton swab dipped in isopropyl alcohol. cotton swab dipped in isopropyl alcohol.
4-49. 4-49. DC DC Volts Volts Test Test
4-50. The DC Volt 4-50. The DC Volts Test limits s Test limits are printed
Volts Test Card and in Table 4-3. Volts Test Card and in Table 4-3. The instrument set-up
information is also printed on the test card. information is also printed
the test card corresponds to a step in the test procedure. the test card corresponds to a step
Because of this, each step number on the test card is Because of this, each step number on the test card is
shown in parenthesis (e.g., Step #1.) in the procedure. shown in parenthesis (e.g., Step #1.) in the procedure.
TEST
Test is separated into rated into five main five main
and the tests themselves s themselves
1 hour warm-up time.
Test is separated separated into
NOTE NOTE
are printed on the DC on the DC
The instrument set-up
on the test card. Each step on Each step on
in the test procedure.
Table 4-3. DC Volts Table 4-3.
4-51. 4-51.
applied to the 3478A's HI and LO INPUT Terminals. applied to the 3478A's HI and LO INPUT
4-52. 4-52.
required test equipment for the DC required test equipment for the DC Volts Test.
Digital Voltmeter (-hp- Model 3456A) Digital Voltmeter (-hp- Model 3456A)
DC Volts Standard (Systron Donner Model M107) DC Volts Standard (Systron Donner Model
into the the
4-53. 4-53.
warmed up for at least one hour, do the following: warmed up for at least one hour, do the following:
a. a. (Step #1.) (Step #1.) Reset the 3
Shift button and then the SGL/TRIG (TEST/RESET) Shift button and then the SGL/TRIG (TEST/RESET)
button. button.
Resetting the 3478A, automatically places Resetting the 3478A, automatically places
the instrument into the DC Volts Function, the instrument into the DC Volts Function,
Autorange, Internal Trigger, and 5 Digits Autorange, Internal Trigger, and 5 Digits
Display mode. Display mode.
b. b. (Step #2.) (Step #2.) Short the
Terminals. The instrument Terminals.
Range. Range.
c. c. Record the display Record the displayed reading on
make sure the reading is within the limits shown on the make sure the reading is within the limits shown on the
Test Card and in Test Card and in Table 4-3.
d. d. (Step #3, 4, (Step #3, 4, 5, and 6.) Set
3V, 30V, and 300V Range by pressing the Uprange 3V, 30V, and 300V Range by pressing the Uprange
button once for each button o
reading on each range is within the specified reading on each rang
DC Volts Test Limits Test Limits
4-5 4-5
Unless othe Unless otherwise specified, rwise specified, all test
Equipment Required. Equipment Required.
Test Procedure. Test Procedure. After After the
Reset the 3478A by 478A by pressing the blue
NOTE NOTE
Short the 3478A's 3478A's HI and L
The instrument should now should now be on the
ed reading on the Test Card and
Table 4-3.
5, and 6.) Set the 3478A to the 30
nce for each range. range. Record and make sure Record and make sure the
e is within the specified limits.
TM 11-6625-3071-14 TM 11-6625-3071-14
all test signals are signals are
Terminals.
The following is the The following is the
Volts Test.
M107)
the 3478A 3478A has has been been
pressing the blue
HI and LO INPUT O INPUT
be on the 30mV 30mV
the Test Card and
the 3478A to the 300mV, 0mV,
the
limits. If If