TB-9-6625-2400-24
*TB 9-6625-2400-24
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
TPI MODEL 275
DIGITAL AMP METER
Headquarters, Department of the Army, Washington, DC
9 June 2010
Distribution Statement A: Approved for public release; distribution is unlimited.
REPORTING OF ERRORS AND RECOMMENDING IMPROVEMENTS
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SECTION
I.
II.
III.
Paragraph
Page
IDENTIFICATION AND DESCRIPTION
Test instrument identification ...........................
Forms, records, and reports ................................
Calibration description .......................................
1
2
3
2
2
2
EQUIPMENT REQUIREMENTS
Equipment required ............................................
Accessories required ............................................
4
5
3
3
CALIBRATION PROCESS
Preliminary instructions .....................................
Equipment setup .................................................
Dc voltage..............................................................
Ac voltage ..............................................................
Ac current .............................................................
Dc current .............................................................
Resistance .............................................................
Frequency .............................................................
Capacitance...........................................................
Temperature .........................................................
Final procedure.....................................................
6
7
8
9
10
11
12
13
14
15
16
4
4
4
5
6
6
7
8
8
9
9
_________
*This bulletin supersedes TB 9-6625-2400-24, dated 21 January 2010, including all changes.
TB 9-6625-2400-24
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of TPI Model 275, Digital Amp Meter. The manufacturers’ manuals were used
as the prime data sources in compiling these instructions. The equipment being calibrated
will be referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. None
b. Time and Technique. The time required for this calibration is approximately 2
hour for each item, using the dc and low frequency technique.
2. Forms, Records, and Reports
a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. Report only those adjustments made and designated (R).
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Dc Voltage
Range: 0 to 600 V (in 5 ranges)
Range:
Accuracy:1
110 mV to 600 V
0.5 + 2
Dc Current
Range: 0 to 400 A (in 4 ranges)
Range:
Accuracy:1
110 μ and 1100 μA
0.8 + 2
110A
3.0 + 10
400A
3.0 + 5
Ac Voltage
Range: 0 to 600 V (in 5 ranges)
Frequency: 45 Hz to 450 Hz 2
Range:
Accuracy:1
110 mV
1.2 + 5
1V and 11V
1.2 + 3
110 V and 600V
1.5 + 3
Ac current
Range: 0 to 400 A (in 2 ranges)
Frequency: 45 Hz to 450 Hz3
Range:
Accuracy:1
110 and 400 A
3.0 + 5
Resistance
Range: 0 to 11 M: (in 6 ranges)
Range:
Accuracy:1
110 :
1.0 + 5
1 K: through 110 k:
1.0 + 2
1 M:
3.0 + 5
11 M:
3.0 + 10
110 M:
3.0 + 20
Capacitance
Range: 11 nF to 110 mF (in 8 ranges) 4
Range:
Accuracy:1
0 to 11mF
3.0 + 5
110 mF
7.0 + 5
See footnotes at end of table.
2
TB 9-6625-2400-24
Table 1. Calibration Description - Continued
Test instrument parameters
Performance specifications
Temperature
Range: -40 to 1000 ºF
Range:
Accuracy:
32 ºF to 120 ºF
± 2 ºF
-3 ºF to 749 ºF
± 1.0%+ 2.0 ºF
750 ºF to 1000 ºF
± 2.0% + 1.5 ºF
-40 ºF to -4 ºF
± 2% + 4 ºF
Frequency
Range: 1111.0 Hz to 110 MHz (in 6 ranges)
Range:
Accuracy: 1
1111.0 Hz to 110 MHz
±1+2
1Accuracy: r (% of reading + digits).
245 Hz to 10 0Hz frequency response 400 mV range. 45 Hz to 450 Hz frequency response all other ranges.
345 Hz to 100 Hz frequency response 200 A to 400 A. 45 Hz to 450 Hz frequency response below 200 A.
4Capacitance only checked to 1 μf.
SECTION II
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment to be used in this
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286; AN/GSM-287; or AN/GSM-705. Alternate items may be used
by the calibrating activity when the equipment listed in table 2 is not available. The items
selected must be verified to perform satisfactorily prior to use and must bear evidence of
current calibration. The equipment must meet or exceed the minimum use specifications
listed in table 2. The accuracies listed in table 2 provide a four-to-one ratio between the
standard and TI. Where the four-to-one ratio cannot be met, the actual accuracy of the
equipment selected is shown in parenthesis.
5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this
calibration. The following peculiar accessories are also required for this calibration:
cool/heat source, Thermalcal Inc., model M28 and Fluke 5500A calibration coil.
Common name
CALIBRATOR
CAPACITANCE
STANDARD
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Minimum use specifications
(part number)
Fluke, Model 5720A (5720A) (p/o
Dc voltage:
MIS-35947); w amplifier, Fluke
Range: 0 to 600 V
5725A/AR (5725A/AR)
Accuracy: r0.0125%
Ac voltage
Range: 0 to 600 V
Frequency: 45 Hz to 450 Hz
Accuracy: r.0.3%
Resistance
Range: 0 to 100 M
Accuracy: r0.25%
Dc current:
Range: 0 to 11A
Accuracy: r0. 2%
Ac current
Range: 0 to 11A
Frequency: 45 Hz to 450 Hz
Accuracy: r0.75%
Range:
5 nF to 1 F
Arco Electronic, Model SS-32
Accuracy: ±0.75%
(7907233)
3
TB 9-6625-2400-24
Table 2. Minimum Specifications of Equipment Required – Continued
Manufacturer and model
Common name
Minimum use specifications
(part number)
Agilent, Model 33250A (33250A)
FUNCTION
Range: 1 kHz to 11 MHz
GENERATOR
Accuracy: ±0.25%
SG-1207/U)
SIGNAL GENERATOR
Range: 11 MHz to 100 MHz
Accuracy: ±0.25%
Azonix, Model A1012
THERMOMETER
Range:-25° C to 250° C
(MIS 38958) w/Temperature Probe
Accuracy: ±0.25%
Instrulab, Model 4101-10X
SECTION III
CALIBRATION PROCESS
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the results of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturers’ manuals for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance checks where applicable.
a. Remove protective cover from TI only to make adjustments and replace
upon completion.
b. Turn TI rotary switch to
V (volts DC).
c. Allow at least 10 minutes for stabilization.
d. Press R-H push button to activate the manual ranging mode. Pressing the R-H
button cycles through the available ranges. Set the range to 110 mV range.
8. Dc Voltage
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI V/:/μA and COM.
4
TB 9-6625-2400-24
(2) Adjust calibrator for a 100 mV dc output. If TI does not indicate between 99.3 mV
and 100.7 mV, perform b below.
(3) Adjust the TI range and calibrator output for the remaining settings listed in
table 3. TI will indicate within limits specified.
(4) Reduce calibrator output to minimum. Set operate/standby switch to standby.
Table 3. Dc Voltage
Test instrument
ranges
110 mV
1
V
11
V
110
V
600
V
Calibrator output
100
1.00
10.00
100.00
600.00
mV
V
V
V
V
Test instrument indications
Min
Max
99.3
mV
100.7
0.993 V
1.007
9.93
V
10.07
99.3
V
100.7
595
V
605
mV
V
V
V
V
b. Adjustments
(1) Set the range to 110 mV range.
(2) Adjust calibrator output for 100mVdc output.
(3) Press the operate/standby switch to operate.
(4) Adjust VR3 for a TI indication of 100.00 mV. (R)
(5) Repeat steps 8 a (2) and (3) above. If any other values are not within tolerance
adjust VR3. If VR3 is adjusted, repeat all voltage checks to insure they are within
tolerance.
9. Ac Voltage
a. Performance Check
(1) Turn TI rotary switch to aV (volts AC). Set range to 110 mV.
(2) Adjust calibrator for a 100 mV at 45Hz ac output.
between 98.3 mV and 101.7 mV, perform b below.
If TI does not indicate
(3) Adjust the TI ranges and calibrator outputs for the remaining settings listed in
table 4. TI will indicate within limits specified.
(4) Reduce calibrator output to minimum. Set operate/standby switch to standby.
Disconnect meter leads from the meter.
Test instrument
ranges
110 mV
110 mV
1
V
1
V
11
V
11
V
110
V
110
V
600
V
600
V
Table 4. Ac Voltage
Calibrator output settings
Voltage
Frequency
100
mV
45 Hz
100
mV
100 Hz
1 V
45 Hz
1 V
450 Hz
10
V
45 Hz
10
V
450 Hz
100
V
45 Hz
100
V
450 Hz
600
V
45 Hz
600
V
450 Hz
Test instrument indications
Min
Max
98.3
mV
101.7
98.3
mV
101.7
985
mV
1.015
985
mV
1.015
9.85
V
10.15
9.85
V
10.15
98.2
V
101.8
98.2
V
101.8
588
V
612
588
V
612
mV
mV
V
V
V
V
V
V
V
V
5
TB 9-6625-2400-24
b. Adjustments
(1) Short the input; turn VR2, and adjust the Zero point.
(2) Set calibrator output for 1 Vac at 60Hz output.
(3) Press the operate/standby switch to operate.
(4) Adjust VR1 for a TI indication of 1.00 Vac. (R)
(5) Repeat steps 9 a (1) thru (4).
10. Ac Current
a. Performance Check
(1) Turn TI rotary switch to aA (Amps AC). Set the TI range to 110 A.
(2) Connect the calibrator output to the calibration coil. Clamp TI around the coil.
(3) Set the calibrator output for 0.4 amps at 60Hz.
(4) TI will indicate within limits specified in table 5 for the 110A range. If TI does
not indicate within the limits of table 5, perform b (1), (2) and 5 below.
(5) Set TI range to 400 A.
amplifier output to the coil.
Disconnect the calibrator output and connect the
(6) Set the calibrator output for 4.0 amps at 60Hz.
(7) TI will indicate within limits specified in table 5 for the 400A range. If TI does
not indicate within the limits of table 5, perform b (3) thru (5) below.
(8) Reduce calibrator output to minimum. Set operate/standby switch to standby.
Table 5. Ac Current
Test instrument
rotary switch
110 A
400 A1
Test instrument indications
Min
Max
19.35
A
20.65
A
193.5
A
206.5
A
Calibrator output
0.4 A
4.0 A
1Move connection to the amplifier output.
b. Adjustments
(1) Set TI range to 110 A. Set the calibrator output for 0.4 amps at 60Hz.
(2) Adjust VR1 for a 20.00 A indication. (R)
(3) Set TI range to 400 A. Set the calibrator output for 4.0 amps at 60Hz.
(4) Adjust VR7 for a 200.0 A indication. (R)
(5) Repeat step 10 a above.
11. Dc Current
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI V/:/μA.
(2) Turn TI rotary switch to μA
6
(micro amps DC).
TB 9-6625-2400-24
(3) Adjust calibrator for a 100 μA output. TI will indicate within limits specified in
table 6.
(4) Repeat (3) for the 1100 μA range using calibrator output for range and limits in
table 6. Disconnect meter leads from the meter.
(5) Turn TI range switch to 110 A
(Amps DC). Press DC A zero button and
adjust for a zero reading. Connect the calibrator output to the calibration coil. Set the
calibrator output for 0.4 amps. Clamp TI around the coil. TI will indicate within limits
specified in table 6 for 110 A range.
(6) Turn TI rotary switch to 400 A
(Amps DC). Press DC amp zero button and
adjust for a zero reading. Set the calibrator output for 4.0 amps. TI will indicate within
limits specified in table 6 for 400 A range.
(7) Reduce calibrator output to minimum. Set operate/standby switch to standby.
Table 6. Dc Current
Test instrument
ranges
110 PA
1100 PA
110 A
400 A 1
Calibrator output
100
1.1
0.4
4.0
1Move connection to the amplifier output.
PA
mA
A
A
Test instrument indications
Min
Max
99.18
PA
100.82
PA
1091
PA
1109
PA
19.30
A
20.70
A
193.5
A
206.5
A
b. Adjustments. No adjustments can be made.
12. Resistance
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI V/:/μA and COM.
(2) Turn TI rotary switch to : (ohms) and press R-H (range) button to 110 : range.
(3) Set calibrator for a 100 : output and 2 wire Comp on.
(4) Rotate calibrator knob below EDIT FIELD pushbutton to adjust calibrator
display indication to equal TI indication. Calibrator err display will indicate within limits
specified in first row of table 7.
(5) Repeat technique of (2) through (4) above, using calibrator outputs and TI
indications listed in table 7. Calibrator err display will indicate within limits specified in
table 7.
Test instrument
RANGE
110 1 K:
11 K:
110 K :1
1 M:
11 M:
110 M
1Set
Table 7. Resistance
Calibrator
ERROR display indication
Output
r(%)
1.50
100
:
1.20
1
k:
1.20
10
k:
100
k:1
1.20
3.50
1
M:
4.00
10
M:
5.00
100
M:
calibrator 2 wire Comp off before setting output.
7
TB 9-6625-2400-24
b. Adjustments. No adjustments can be made.
13. Frequency
a. Performance Check
(1) Connect function generator to TI V/:/μA and COM inputs.
(2) Set TI rotary switch to Hz.
(3) Set function generator to 1 kHz. Adjust function generator amplitude as
necessary to achieve stable frequency reading. TI will indicate within limits specified in
first row of table 8.
(4) Repeat technique of (3) above for ranges, settings and indications listed in table
8 up to 11 MHz. TI will indicate within limits specified in table 8.
(5) Set the TI range switch to 110 MHz. Connect the signal generator to TI V/:/μA
and COM inputs. Adjust the signal generator frequency to 100 MHz. TI will indicate
within limits specified in table 8 for the 110 MHz range.
Function generator output
frequency
Frequency
1000.0 Hz
10
kHz
100
KHz
1
MHz
10
MHz
100
MHz
Table 8. Frequency Accuracy
Test instrument
Test instrument
range
indication (Hz)
Frequency
Min
Max
1111.0
Hz
989.8
Hz
1010.2
Hz
11.000
kHz
9.898
kHz
10.102
kHz
110.00
kHz
98.98
kHz
101.02
kHz
1.1000
MHz
.9898 MHz
1.0102 MHz
11.000
MHz
9.898
MHz
10.102
MHz
110.00 MHz
98.98
MHz
101.02
MHz
(6) Set function generator output to minimum and disconnect equipment setup.
b. Adjustments. No adjustments can be made.
14. Capacitance
a. Performance Check
(1) Connect leads to TI V/:/μA and COM inputs.
(2) Set function switch to
push REL pushbutton.
(capacitance). Set range to first range in table 9, and
(3) Connect open end of leads to 10.0 nF capacitance standard. TI will indicate
within limits specified in first row of table 9.
(4) Repeat technique of (2) and (3) above, using settings and indications listed in
table 9. TI will indicate within limits specified table 9.
Capacitance standard
Value1
10.0
nF
100
nF
1.1
μF
1
Table 9. Capacitance Accuracy
Test instrument
Range
Min
11.0
nF
9.695 nF
110
nF
96.95 nF
1.0
μF
0.9695 μF
Capacitance values are nominal; actual values are derived from Test Report.
actual values.
8
Max
10.305 nF
103.05 nF
1.0305 μF
Min and Max values are different from
TB 9-6625-2400-24
(5) Disconnect capacitance standard.
b. Adjustments. No adjustments can be made.
15. Temperature
a. Performance Check
NOTE
A type k thermocouple probe must accompany TI in order to
perform this check. Ensure that TI temperature probe and
thermometer probe are inserted into cool/heat source wells to
the same depth.
(1) Remove test leads. Connect temperature probe to TI V/:/μA and COM inputs.
(2) Insert TI temperature probe and thermometer probe into cool/heat source.
(3) Set TI rotary switch to TEMP.
(4) Adjust cool/heat source for a thermometer reading of 32ºF (0º C). Allow
sufficient time for temperature stabilization prior to making measurement. TI will indicate
within limits specified in first row of table 10. If TI does not indicate within the limits of
table 10, perform b below.
(5) Repeat technique of (4) above, using settings and indications listed in table 10.
TI will indicate within limits specified in table 10.
Table 10. Temperature Accuracy
Thermometer
Test instrument
reading
Min
Max
32 º F (0 º C)
30
°F
34
°F
120 º F (37.77 ºC)
118
°F
122
°F
212 º F (100.00 ºC)
208
°F
216
°F
325 º F (176.66 º C)
320
°F
330
°F
b. Adjustments
(1) Set the cool/heat source to 32º F (0ºC). Adjust VR5 within 2.7º F. Adjust VR6 to
read 32º F on the TI. (R)
(2) Set the cool/heat source to 120º F. Insure that the TI reads between 118 º F and
122º F.
16. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
9/(10 Blank)
By Order of the Secretary of the Army:
GEORGE W. CASEY, JR.
General, United States Army
Chief of Staff
Official:
JOYCE E. MORROW
Administrative Assistant to the
Secretary of the Army
1014608
Distribution:
To be distributed in accordance with the initial distribution number (IDN) 345050,
requirements for calibration procedure TB 9-6625-2400-24.
Instructions for Submitting an Electronic 2028
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6, 7, 8, 9, 10, 13, 15, 16, 17, and 27.
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Subject:
DA Form 2028
1. From: Joe Smith
2. Unit: home
3. Address: 4300 Park
4. City: Hometown
5. St: MO
6. Zip: 77777
7. Date Sent: 19-OCT –93
8. Pub no: 55-2840-229-23
9. Pub Title: TM
10. Publication Date: 04-JUL-85
11. Change Number: 7
12. Submitter Rank: MSG
13. Submitter FName: Joe
4. Submitter MName: T
15. Submitter LName: Smith
16. Submitter Phone: 123-123-1234
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