HP 3478A Technical Manual page 34

4-1. INTRODUCTION 4-1. INTRODUCTION
4-2. This section 4-2. This section of the of the manual has
Tests and Calibration Procedures used to verify the Tests and Calibration Procedures used to verify the
3478A's accuracy specifications, and to calibrate the 3478A's accuracy specifications, and to calibrate the
multimeter to th multimeter t o those specificatio ose specifications.
specifications to which the 3478A is tested and calibrated specifications to which the 3478A is tested and calibrated
is listed in is listed in Table 4-1. Table 4-1. The complete specifications are in The complete specifications are in
Table 1-1. All tests Table 1-1. All tests and calibrations and calibrations are made wit
removing any instrument 'covers. removing any instrument 'covers.
4-3. 4-3. Since Performance Since Performance Tests are
after calibration, the tests are included in the Calibration after calibration, the tests are included in the Calibration
Procedures. Procedures. The procedures The procedures are set
that the Performance Tests can be ignored, if so desired. that the Performance Tests can be ignored, if so desired.
Table 4-1. Table 4-1. Abbreviated Abbreviated Specifications
DC Volts Function (accuracy = DC Volts Function (accuracy = ± ±
Range Range 24 Hour 24 Hour Limits Limits
30mV 30mV 0.027 + + 35 0.027 35
300mV 300mV 0.005 + + 4 4 0.005
3V 3V 0.0034 0.0034 + + 2 2
30V 30V 0.005 0.005 + + 3 3
300V 300V 0.0055 0.0055 + + 2 2
DC Carrot Function (accuracy = DC Carrot Function (accuracy =
Range Range 90 90 Day Day Limits Limits
300mA 300mA 0 0 11 11 + + 40 40
3A<1A 3A<1A 0.14 + + 6 6 0.14
3A>1A 3A>1A 1.0 + + 30 1.0 30
Ohms Function (accuracy = Ohms Function (accuracy = (% of reading + number of counts) (% of reading + number of counts)
± ±
Range Range 24 Hour 24 Hour Limits Limits
30 30 0.023 + + 35 0.023 35
300 300 0.0045 0.0045 + + 4 4
3K 3K 0.0035 + + 2 2 0.0035
30K 30K 0.0035 0.0035 + + 2 2
300K 300K 0.0035 0.0035 + + 2 2
3M 3M 0.0052 0.0052 + + 2 2
30M 30M 0.036 + + 2 2 0.036
AC Volt Function 1 Year Limits (accuracy = AC Volt Function 1 Year Limits (accuracy =
counts) counts)
Freq Frequenc uency y 300 mV 300 mV Rang Range e 3V
20Hz 20Hz 50Hz 50Hz 1.14 + + 163 1.14 163
50Hz 50Hz 100Hz 100Hz 0.46 0.46 + + 163 163
100Hz 100Hz 20KHz 20KHz 0.29 + + 163 0.29 163
20KHz 20KHz 50KHz 50KHz 0.56 + + 247 0.56 247
50KHz 50KHz 100KHz 100KHz 1.74 + + 882 1.74 882
100KHz 100KHz 300KHz 300KHz N/A N/A
AC Current Function 1 Year Limits (accuracy - AC Current Function 1 Year Limits (accuracy -
counts)) counts))
Frequency Frequency 300mA Range 300mA Range
20Hz 20Hz 50Hz 50Hz 1.54 1.54 + + 163 163
50Hz 50Hz 1KHz 1KHz 0.81 0.81 + + 163 163
1KHz 10KHz 1KHz 10KHz 0.72 0.72 + + 163 163
10KHz 20KHz 10KHz 20KHz 0.86 0.86 + + 163 163
PERFORMANCE TEST AND CALIBRATION PERFORMANCE TEST AND CALIBRATION
manual has the Per the Performance formance
ns. A summary A summary of the
are made without
Tests are normally normally performed performed
are set up in such up in such a way
Specifications Table Table
(% of reading - number of (% of reading - number of counts)) counts))
90 Day 90 Day Limit Limit 1 1 Year Year Limits Limits
0.03 + + 41 0.03 41 0.04 0.04 + + 41 41
0.0074 + + 5 5 0.0074 0.02 + + 5 5 0.02
0.0059 0.0059 + + 2 2 0.0188 0.0188 + + 2 2
0.0074 0.0074 + + 3 3 0.02 + + 3 3 0.02
0.0076 + + 2 2 0.0076 0.02 + + 2 2 0.02
± ± (% of reading + number of (% of reading + number of counts) counts)
1 1 Year Year Limits Limits
0.15 0.15 + + 40 40
0.17 0.17 + + 6 6
1 1 0 0 + + 30 30
90 90 Day Day Limits Limits 1 1 Year Year Limits Limits
0.0027 0.0027 + + 41 41 0.034 0.034 + + 41 41
0.012 0.012 + + 5 5 0.017 0.017 + + 5 5
0.011 0.011 + + 2 2 0.016 0.016 + + 2 2
0.011 0.011 + + 2 2 0.016 0.016 + + 2 2
0.011 0.011 + + 2 2 0.016 + + 2 2 0.016
0.011 0.011 + + 2 2 0.016 0.016 + + 2 2
0.066 + + 2 2 0.066 0.078 0.078 + + 2 2
(% of reading + number of (% of reading + number of
± ±
3V Rang Range e 30V 30V Range Range 300V Rang 300V
1.14 + + 102 1.14 102 1.14 + + 102 1.14 102 1.18 + + 102 1.18
0.46 + + 103 0.46 103 0 0 46 46 + + 102 102 0.5 + + 102 0.5
0.26 + + 102 0.26 102 0.26 +102 0.26 +102 0.33 + + 102 0.33
0.41 0.41 + + 180 180 0.37 + + 180 0.37 180 0.56 + + 180 0.56
1.05 + + 825 1.05 825 0.84 0.84 + + 825 825 1.26 1.26 + + 825
10.1 + + 3720 10.1 3720 N/A N/A
(% of reading + Number of (% of reading + Number of
± ±
3A Range 3A Range
2.24 + + 163 2.24 163
1.5 1.5 + + 163 163
1.42 1.42 + + 163 163
1.56 1.56 + + 163 163
SECTION IV SECTION IV
4-4. 4-4. EQUIPMENT EQUIPMENT REQUIRED
4-5. 4-5. All the All the required t
Tests and Calibration Procedures are listed in Tests and Calibration Procedures are listed in Table 4-2
of the (Recommended Test Equipment) (Recommended
the individual tests is also listed at the beginning of each test the individual tests is also listed at the beginning of each test
procedure. procedure.
hout available, use substitute available, u se substitute equipment.
the required equipment and the critical specifications the required equipment and the critical specifications
necessary to do the test and calibration procedures is in the necessary to do the test and calibration procedures is in the
following following paragraphs. paragraphs.
choosing substitute equipment. choosing substitute equipment.
a way
4-6. 4-6. DC Volts DC Volts Test and
4-7. The DC Volts 4-7. The DC Volts Test and Calibration (
requires a very accurate Digital Voltmeter (like the 3456A) as requires a very accurate Digital Voltmeter (like the 3456A) as
the Standar the Standard. d. The Digital Voltmeter
24 hour dc volts specifications before calibrating and testing 24 hour dc volts specifications before calibrating and testing
the 3478A (i.e. the 3478A (i.e. the 3478A is te
hours after the Digital Voltmeter, used as the standard, has hours after the Digital Voltmeter, used as the standard, has
been calibrated). It is recommended tha been calibrated).
be calibrated in the same temperature environment and leave be calibrated in the same temperature environment and leave
it in the environment in which the 3478A is to be calibrated it in the environment in which the 3478A is to be calibrated
and tested (e.g. and t ested (e.g. the 347
Paragraph 4-39). . In addition Paragraph 4-39)
Volts Standard is required to be used as a very stable voltage Volts Standard is required to be used as a very stable voltage
source. source. The following The follow
recommended models. recommended models.
4-8. Digital 4-8. Digital Voltmeter.
is an -hp- Mod is an -hp- Model 3456A.
follows: follows:
a. a. Required voltage range Required voltage range is from 30mV t
b. b. Accuracy and st Accuracy and stability require
Range e
is as follows: is as follows:
102
.004% for the 30V and 300V Ranges .004% for the 30V and 300V Ranges
± ±
102
102
±.005% for the 300mV and 3V Ranges ±.005% for the 300mV and 3V Ranges
180
±.025% for the 30mV Range ±.025% for the 30mV Range
825
N,A N,A
4-9. 4-9. DC DC Volts Volts Standard.
a Systron Donner Model M107 Precision Voltage Source. a Systron Donner Model M107 Precision Voltage Source.
The critical requirements are as follows: The critical requirements are as follows:
4-1 4-1
REQUIRED
required test equipment est equipment for the
Test Equipment). . The equipment The equipment used
If any of the If any of the recommended equipment recommended equipment is not
equipment. A short
This information may This information
Test and Calibration Calibration
Test and Calibration (DC Volts Function)
The Digital Voltmeter must be calibrated
the 3478A is tested and calibrated sted and calibrated within 24
It is recommended that the Digital Voltmete
the 3478A's Refere 8A's Reference Temperature,
In addition to the to the Digital Voltmeter,
ing lists t lists the he required required equipment
Voltmeter. The recommended Digital Voltmeter The recommended Digital Voltmeter
el 3456A. The critical re The critical requirements are
is from 30mV to 300V dc.
ability requirements in a 24 hour p ments in a 24 hour period
Standard. The DC Volts Standard chosen is The DC Volts Standard chosen is
TM 11-6625-3071-14 TM 11-6625-3071-14
for the Performance Performance
Table 4-2
used for for
is not
A short description of description of
may be be helpful in helpful in
DC Volts Function)
must be calibrated to its to its
within 24
t the Digital Voltmeter r
nce Temperature, see see
Digital Voltmeter, a DC a DC
equipment and and
quirements are as as
o 300V dc.
eriod