*TB 9-6625-1176-35
SUPERSEDED COPY DATED 21 DECEMBER 1984
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
PULSE GENERATOR
HEWLETT-PACKARD MODEL 214B
Headquarters, Department of the Army, Washington, DC
6 May 1987
Approved for public release; distribution is unlimited.
REPORTING OF ERRORS
You can help improve this publication by calling attention to errors and by
recommending improvements and stating your reasons for the
recommendations. Your letter or DA Form 2028, Recommended Changes to
Publications, should be mailed directly to Commander, U.S. Army Aviation and
Missile Command, ATTN: AMSAM-TMD-EP, Redstone Arsenal, AL 35898-5400.
You may also contact this office electronically. E-mail address is tmdee@redstone.army.mil. FAX to DSN 788-2313 (commercial 205-842-2313). A
reply will be furnished directly to you.
SECTION I. IDENTIFICATION AND DESCRIPTION
Test instrument identification ................. 1 2
Forms, records, and reports ..................... 2 2
Calibration description .............................. 3 2
II. EQUIPMENT REQUIREMENTS
Equipment required ................................. 4 3
Accessories required ................................. 5 3
III. CALIBRATION PROCESS
Preliminary instructions .......................... 6 4
Equipment Setup ...................................... 7 6
Pulse repetition rate........................................... 8 6
Pulse position...................................................... 9 10
Pulse width and duty cycle................................. 10 14
Pulse amplitude and characteristics .................. 11 19
Trigger output and double pulse ........................ 12 25
External trigger level and sensitivity ................ 13 26
Power supply ...................................................... 14 27
Final procedure .................................................. 15 28
__________
*This bulletin supersedes TB 9-6625-1176-35, 21 December 1984, including all changes.
Paragraph Page
TB 9-6625-1176-35
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin provides instructions for the
calibration of Pulse Generator, Hewlett-Packard, Model 214B. The manufacturer's manual
was 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 4
hours, 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. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (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
Repetition rate Range: Repetition rate 10 Hz to 10 MHz in six
decade ranges. In 30 to 100 V
amplitude range, maximum repetition
rate is 4 MHz. Calibrated vernier
provide continuous adjustment within
ranges.
Accuracy: ±(10% of setting +1% of FS)
Pulse width Range: 25 ns to 10 ms in 6 decade ranges;
continuously adjustable by vernier
Accuracy: ±(10% of setting +1% of FS) +5 ns
Duty cycle
Transition times
Preshoot, overshoot, and
ringing
Pulse polarity Positive or negative, switch selectable
Pulse delay Pulse can be delayed with respect to trigger
Pulse advance Pulse can be advanced with respect to trigger
≥10% for 30-100 V amplitude range
≥50% for all other ranges (maximum 10 ms width)
Accuracy: ≤15 ns for leading and trailing
edges
Accuracy: ≤+5% of pulse amplitude
output from +10 ns ( + fixed delay) to +10 ms
in 5 decade ranges (fixed delay is 50 ±10 ns)
output from +10 ns ( - fixed delay) to +10 ms
in 5 decade ranges (fixed delay is 50 ±10 ns)
Accuracy: ±(10% of setting +1% of FS) + fixed
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TB 9-6625-1176-35
delay (fixed delay is 50 ±10 ns)
Pulse amplitude
Constant duty cycle Duty cycle of output pulse remains constant when
Trigger output amplitude
Pulse Width
Double pulse 5 MHz maximum in all ranges except 30 to 100 V range.
External input:
Trigger level
Sensitivity
Source impedance
Range: 0.3 V to 100 V into 50Ω, 5 ranges with
calibrated vernier providing continuous
adjustment within ranges.
Accuracy: ±10% of setting
pulse period is changed.
Typically 8% fixed for 10 - 1 MHz frequency range
2.5% to 10% for 1 to .1 MHz frequency range,
.25% to 10% for .1 MHz - 10 Hz frequency range,
and .1% to 10% for all other frequency ranges
Accuracy: ±(15% of setting +1% of FS)
≥+5 V (from 50Ω into open circuit)
10 ns typical
In 30 to 100 V range, maximum frequency is 2 MHz.
Minimum separation between double pulse is 100 ns.
Range: Dc to 10 MHz
Continuously variable from -5 V to +5 V
500 mV p-p, dc coupled
50Ω nominal
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. 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.
5. Accessories Required. The accessories listed in table 3 are issued as indicated in
paragraph 4 above and are used in this calibration procedure. When necessary, these items
may be substituted by equivalent items, unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required
Item Common Name
(Official Nomenclature)
A1 DIGITAL VOLTMETER Range: 5 to 300 V dc
A2 FREQUENCY COUNTER Range: 1 Hz to 10 MHz
A3 OSCILLOSCOPE Range: 10 Hz to 200 MHz
Minimum Use
Specifications
Accuracy: ±0.02%
Accuracy: ±1.25%
Accuracy: ±5%
Manufacturer and Model
(Part Number)
Hewlett-Packard, Model
3490AOPT060 w/K25-3490A
(3490AOPT060 w/K25-3490A)
Hewlett-Packard, Model 5345A
(MIS-28754/1 Type 1) w/5355A
and K87-59992A
Tektronix, Type R5440 (MIS-
28706/1 Type 1) w/5A48 (MIS28706/3), 5B42 (MIS-28706/4)
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TB 9-6625-1176-35
and 5S14 (MIS-28706/5)
A4 SIGNAL GENERATOR Range: 300 mV to 11 V p-p
Accuracy: N/A
A5 TERMINATION LOAD
(DUMMY LOAD)
Item Common Name
(Official Nomenclature)
B1 ADAPTER BNC T-type, 2 jacks, 1 plug (MS-35173-274C)
B2 ADAPTER BNC plug to N jack (10519458)
B3 ADAPTER BNC plug to double banana jacks (7909401)
B4 ADAPTER
(CALIBRATION
FIXTURE)
B5 ATTENUATOR
B6 CABLE
B7 LEAD
B8 PROBE
B9 TERMINATION
1
Two required.
2
Three required.
2
1
(TEST LEAD)
(DUMMY LOAD)
Range: N/A Narda, Model 374BNM (374BNM)
Table 3. Accessories Required
(UG1441/U)
Flexible T-type, 2 jacks, 1 plug
(067-05250-01 or 067-0525-02)
1
X10, Tektronix, Type 011-0059-02
30-in., RG-58/U; BNC plug terminations
(7907467)
32-in., single banana plug to test hook (red)
(7915941-1)
36-in., BNC plug to X10 probe, Tektronix. Type
P6106 (010-6106-01)
50Ω feed-through, BNC plug to BNC jack
(11048B or 11048C)
Wavetek, Model 145 (7915944)
Description
(Part Number)
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 and item identification number as listed in tables 2 and 3. For the identification of
equipment referenced by item numbers prefixed with A, see table 2, and for prefix B, see
table 3.
c. Unless otherwise specified, verify the result 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 manufacturer's manual for this TI.
d. When indications specified in paragraphs 8 through 13 are not withi n tolerance,
perform the power supply check prior to making adjustments. After adjustments are made,
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TB 9-6625-1176-35
repeat paragraphs 8 through 13. Do not perform power supply check if all other
parameters are within tolerance.
e. Unless otherwise specified, all controls and control settings refer to the TI.
5
TB 9-6625-1176-35
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.
a. Remove TI protective covers as required for adjustment.
b. Connect TI to a 115-V 60 Hz ac source.
c. Energize equipment and allow sufficient time for equipment to warm up and
stabilize.
8. Pulse Repetition Rate
a. Performance Check
(1) Position controls as listed in (a) through (n) below:
(a) MODE NORM pushbutton pressed.
(b) PERIOD .1µµ-1µµ pushbutton pressed.
(c) PERIOD VERNIER dial to 10.
(d) PULSE POSITION l0n-.1µµ pushbutton pressed.
(e) PULSE POSITION VERNIER dial to 1.
(f) DUTY CYCLE % pushbutton released (out).
(g) WIDTH .1µµ-1µµ pushbutton pressed.
(h) WIDTH VERNIER dial fully ccw.
(i) AMPLITUDE 3-10 pushbutton pressed.
(j) AMPLITUDE VERNIER dial to 3.
(k) INT LOAD pushbutton released (out).
(l) SLOPE switch to POS.
(m) DELAY/ADVANCE/DOUBLE PULSE switch to DELAY.
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TB 9-6625-1176-35
(n) POLARITY switch to POS.
(2) Connect TRIG OUTPUT to frequency counter (A2) A input, using cable and
termination (B6 and B9).
(3) Measure REPETITION RATE, using standard measurement technique. If
frequency counter does not indicate between 890 and 1110 ns, perform b below.
(4) Repeat technique of (3) above for settings listed in table 4. If indications are not
within specified tolerance, perform b below.
Table 4. Repetition Rate
Test Instrument Frequency Counter Indications
PERIOD
Pushbuttons
1µ - 10µ
10µ - .1 m
.1m - 1m 10
1m - 10m 10 8.900 ms 11.1 ms
10m - .1 10 89 ms 111 ms
10m - .1 1 8.000 ms 12.000 ms
1m - 10m 1
.1m - 1m 1
10µ - .1m
1µ - 10µ
.1µ - 1µ
.1µ - 1µ
.1µ - 1µ
.1µ - 1µ
.1µ - 1µ
.1µ - 1µ
.1µ - 1µ
.1µ - 1µ
.1µ - 1µ
PERIOD VERNIER
Dial Settings
10
10
1
1 800 ns
1 80 ns 120 ns
2 170 ns 230 ns
3 260 ns 340 ns
4 350 ns 450 ns
5 440 ns 560 ns
6 530 ns 670 ns
7 620 ns 780 ns
8 710 ns 890 ns
9 800 ns
Min Max
8.900 µs 11.100 µs
89 µs 111 µs
890 µs
800 µs
80 µs 120 µs
8.000 µs 12.000 µs
1.100 ms
1.200 ms
1.200 µs
1.000 µs
b. Adjustments
(1) Position controls as listed in (a) through (g) below:
(a) PERIOD .1µµ-1µµ pushbutton pressed.
(b) PERIOD VERNIER dial fully ccw.
(c) PULSE POSITION 10n-.1µµ pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 1.
(e) DUTY CYCLE % pushbutton pressed.
7
TB 9-6625-1176-35
(f) WIDTH 1µµ-10µµ pushbutton pressed.
(g) WIDTH VERNIER dial to 1.
(2) Adjust R126 (fig. 1) for 12.5-MHz indication on frequency counter (R).
(3) Set PERIOD VERNIER dial to 1 and then to 10. If frequency counter does not
indicate between 8.9 and 11.1 MHz for vernier setting of 1, and between 0.8 and 1.2 MHz
at 10, readjust R126.
(4) Position controls as listed in (a) through (e) below.
(a) PERIOD 1m-1m pushbutton.
(b) PERIOD VERNIER dial to 10.
(c) PULSE POSITION 1µµ-.10µµ pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 1.
(e) DUTY CYCLE % pushbutton released (out).
(5) Adjust R69 (fig. 2) for a frequency counter indication of 1000 µs (R).
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TB 9-6625-1176-35
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TB 9-6625-1176-35
Figure 1. A2 (timing board) adjustment locations (top forward view).
(6) Set PERIOD VERNIER dial to 1.
(7) Adjust R46 (fig. 1) for a frequency counter indication of 100 µs (R).
(8) Set PERIOD VERNIER dial to 10 and repeat (5) through (7) above for best in-
tolerance condition.
9. Pulse Position
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a) PERIOD VERNIER dial to 10.
(b) DUTY CYCLE % pushbutton pressed.
(c) AMPLITUDE 1-3 pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 10.
Figure 2. A1 (amplifier board) - adjustment locations.
10
TB 9-6625-1176-35
(2) Connect TRIG OUTPUT to frequency counter (A2) A input, using cable and
termination (B6 and B9). Connect OUTPUT to frequency counter B input, using cable
(B6).
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TB 9-6625-1176-35
NOTE
If an out-of-tolerance reading is obtained in (3) through (10)
below, perform b below.
(3) Measure time between TRIG OUTPUT and OUTPUT pulses, using standard
measurement technique. Frequency counter will indicate between 129 and 171 ns.
(4) Set PULSE POSITION VERNIER dial to 1. Frequency counter will indicate
between 48 and 72 ns.
(5) Disconnect OUTPUT from frequency counter and set
DELAY/ADVANCE/DOUBLE PULSE switch to ADVANCE. Connect TRIG OUTPUT
to oscilloscope (A3) CH 1 input, using cable (B6). Connect OUTPUT to oscilloscope CH 2
input, using cable (B6).
(6) Measure time between TRIG OUTPUT and OUTPUT pulses, using standard
measurement technique. The results will be between 28 and 52 ns.
(7) Set PULSE POSITION VERNIER dial to 10 and connect TI OUTPUT to
oscilloscope (A3) CH 2 and EXT trigger inputs.
(7.1) Set oscilloscope (A3) trigger source INT/EXT switch to EXT and measure
the time between and OUTPUT and TRIG OUTPUT pulses. Results will be between 29
and 71 ns.
(8) Disconnect cables from oscilloscope inputs and repeat (2) above.
(9) Position controls as listed in (a) through (d) below:
(a) PERIOD l0m-.1 pushbutton pressed.
(b) PERIOD VERNIER dial to 1.
(c) PULSE POSITION .lµµ-lµµ pushbutton pressed.
(d) DELAY/ADVANCE/DOUBLE PULSE switch to DELAY.
(10) Repeat technique of (3) above for settings listed in table 5. Indications will be
within specified limits.
b. Adjustments
(1) Position controls as listed in (a) through (i) below:
(a) PERIOD 1m-10m pushbutton pressed.
(b) PERIOD VERNIER dial to 10.
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TB 9-6625-1176-35
(c) PULSE POSITION .1m-1m pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 10.
(e) DUTY CYCLE % pushbutton released (out).
(f) WIDTH 1µµ-10µµ pushbutton pressed.
(g) WIDTH VERNIER dial to 10.
(h) AMPLITUDE 3-10 pushbutton pressed.
(i) DELAY/ADVANCE/DOUBLE PULSE switch to DELAY.
(2) Connect TRIG OUTPUT to frequency counter (A2) input, using cable and
termination (B6 and B9). Connect OUTPUT to frequency counter B input, using cable (B6).
(3) Adjust R45 (fig. 1) for a frequency counter (A2) i ndication between 990 and 1010
µs (R).
(4) Set PULSE POSITION VERNIER dial to 1. Adjust R119 (fig. 1) for a
frequency counter indication between 90 and 110 µs (R).
(5) Set PULSE POSITION VERNIER dial to 10 and repeat (3) and (4) above for
best in-tolerance condition.
Test Instrument Frequency Counter Indications
PULSE
POSITION
Pushbuttons
.1µ-1µ
1µ-10µ
10µ-.1m
.1m-1m 10
1m-10m 10 8.900 ms 11.100 ms
.1µ-1µ
1µ - 10µ
10µ - .1m
.1m - 1m 1
1m - 10m 1
1m - 10m 2 1.700 ms 2.300 ms
1m - 10m 3 2.600 ms 3.400 ms
1m - 10 m 4 3.500 ms 4.500 ms
1m - 10m 5 4.400 ms 5.600 ms
1m - 10m 6 5.300 ms 6.700 ms
1m - 10m 7 6.200 ms 7.800 ms
1m - 10m 8 7.100 ms 8.900 ms
1m - 10m 9 8.000 ms 10.000 ms
Table 5. Time Measurement for Delay Accuracy
VERNIER Dial
Settings
10 930 ns
10
10
1 120 ns 180 ns
1 840 ns
1
Min Max
8.94 µs 11.16 µs
89.04 µs 111.06 µs
890 µs
8.04 µs 12.06 µs
80 µs 120 µs
800 µs
1.170 µs
1.110 ms
1.26 µs
1.200 ms
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TB 9-6625-1176-35
10. Pulse Width and Duty Cycle
a. Performance Check
(1) Connect equipment as shown in. figure 3.
(2) Position controls as listed in (a) through (j) below.
(a) PERIOD 1µµ-10µµ pushbutton pressed.
(b) PERIOD VERNIER dial to 10.
(c) PULSE POSITION 10n-.1µµ pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 10.
(e) DUTY CYCLE % pushbutton released (out).
(f) WIDTH 25n-.1µµ pushbutton pressed.
(g) WIDTH VERNIER dial to 2.5.
(h) AMPLITUDE 10-30 pushbutton pressed.
(i) AMPLITUDE VERNIER dial to 3 (30V).
(j) INT LOAD pushbutton pressed.
NOTE
If an out-of-tolerance condition is noted in (3) through (27)
below, perform b below.
(3) Adjust controls of oscilloscope (A3) to display 1 pulse of TI output. Pulse width
will be between 21.5 and 33.5 ns.
(4) Set WIDTH VERNIER dial to 10. Pulse width will be between 89 and 116 ns.
(5) Press WIDTH .1µµ -1µµ pushbutton. Pulse width will be between 0.890 and 1.115
µs.
(6) Set WIDTH VERNIER dial to 1. Pulse width will be between 80 and 125 ns.
(7) Press PERIOD .1µµ-1µµ pushbutton and set PERIOD VERNIER dial to 3.
Adjust oscilloscope controls to display 1 period of TI output.
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TB 9-6625-1176-35
(8) Slowly increase WIDTH VERNIER dial until oscilloscope display disappears.
Oscilloscope display will disappear at a duty cycle of 50 percent or greater (pulse width of
150 ns or greater).
(9) Position controls as listed in (a) through (c) below:
(a) WIDTH 25n-.1µµ pushbutton pressed.
(b) AMPLITUDE 30-100 pushbutton pressed.
(c) AMPLITUDE VERNIER dial to 10 (50V).
(10) Repeat technique of (8) above. Oscilloscope display w ill disappear at a duty
cycle of 10 percent or greater (pulse width of 30 ns or greater).
(11) Position controls as listed in (a) through (e) below:
(a) PERIOD 10m-. 1 pushbutton pressed.
(b) AMPLITUDE 1-3 pushbutton pressed.
(c) AMPLITUDE VERNIER dial to 3.
(d) WIDTH 1µµ-10µµ pushbutton pressed.
(e) WIDTH VERNIER dial to 1.
(12) Disconnect TI from oscilloscope and connect OUTPUT to frequency counter (A2)
A and B inputs, using cable and adapter (B6 and B4).
(13) Measure pulse width, using standard mea surement technique. Frequency
counter will indicate between 0.8 and 1.205 µs.
(14) Repeat technique of (13) above, using settings listed in table 6. Indications will
be within specified limits.
(15) Disconnect OUTPUT from frequency counter and connect to oscilloscope CH 1
input, using cable and attenuator (B6 and B5).
(16) Connect TRIG OUTPUT to frequency counter A input and oscilloscope external
trigger input, using cables, adapter, and termination (B6, B1, and B9).
(17) Position controls as listed in (a) through (e) below:
(a) PERIOD .1µµ-1µµ pushbutton pressed.
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TB 9-6625-1176-35
(b) PERIOD VERNIER dial to 10.
(c) PULSE POSITION VERNIER dial to 1.
(d) DUTY CYCLE % pushbutton pressed.
(e) INT LOAD pushbutton released (out).
(18) Set PERIOD VERNIER for exactly 1000 ns frequency counter indication.
Oscilloscope will display a pulse width of approximately 80 ns (8 percent duty cycle).
(19) Press PERIOD 1µµ-10µµ pushbutton and set PERIOD VERNIER for a 10,000 ns
frequency counter indication (2.5-10 percent duty cycle LED is illuminated).
16
Figure 3. Equipment setup - pulse width and duty cycle.
Test Instrument Frequency Counter Indications
WIDTH
Pushbuttons
10µ - .1m
.1m - 1m 1 80 120
1m - 10m 1 800 1200
1µ - 10µ
10µ - .1m
.1m - 1m 10 890 1110
1m - 10m 10 8900 11100
1m - 10m 9 8000 10000
1m - 10m 8 7100 8900
1m - 10m 7 6200 7800
1m - 10m 6 5300 6700
1m - 10m 5 4400 5600
1m - 10m 4 3500 4500
1m - 10m 3 2600 3400
1m - 10m 2 1700 2300
Vernier Dial
Settings
(20) Set WIDTH (duty cycle) VERNIER dial to 2.5. Oscilloscope will display a pulse
width between 202 and 297 ns.
TB 9-6625-1176-35
Table 6. Pulse Width
(µµS)
Min Max
1 8.00 12.00
10 8.90 11.10
10 89.0 111.0
(21) Set WIDTH (duty cycle) VERNIER dial to 10. Oscilloscope will display a pulse
width between 840 and 1160 ns.
(22) Position controls as listed in (a) through (e) below:
(a) PERIOD 10m-.1 pushbutton pressed.
(b) PERIOD VERNIER dial to 10.
(c) PULSE POSITION VERNIER dial to 10.
(d) DUTY CYCLE .1-1 pushbutton pressed.
(e) WIDTH (duty cycle) VERNIER dial to 1.
(23) Disconnect TI from oscilloscope and frequency counter and connect TI OUTPUT
to frequency counter A and B inputs, using cable, adapter, and termination (B6, B4, and
B9).
(24) Using standard measurement technique measure pulse width. Frequency
counter will indicate between 75 and 125 µs (.1 percent duty cycle).
(25) Set WIDTH (duty cycle) VERNIER dial to 10. Frequency counter will indicate
between 840 and 1160 µs (1 percent duty cycle).
17
TB 9-6625-1176-35
(26) Press DUTY CYCLE 1-10 pushbutton and set WIDTH (duty cycle) VERNIER
dial as listed in table 7. Frequency counter will indicate within specified limits.
(27) Set PERIOD VERNIER dial to 1. Frequency counter will indicate between 75
and 125 µs.
b. Adjustments
(1) Position controls as listed in (a) through (g) below:
(a) PERIOD 1m-10m pushbutton pressed.
(b) PERIOD VERNIER dial to 10.
(c) PULSE POSITION .1µµ-1µµ pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 1.
(e) DUTY CYCLE % pushbutton pressed.
(f) DUTY CYCLE 1-10 pushbutton pressed.
(g) WIDTH (duty cycle) VERNIER dial to 10.
(2) Connect OUTPUT to frequency counter (A2) A and B inputs, using cable and
adapter (B6 and B4).
(3) Set frequency counter to measure period and set PERIOD VERNIER for a
10,000 µs frequency counter indication.
(4) Set frequency counter to measure pulse width and adjust R51 (fig. 1) for a 1000
µs frequency counter indication (10 percent duty cycle) (R).
(5) Repeat technique of b(3) above and set PERIOD VERNIER for a 1000-µs
frequency counter indication.
(6) Repeat technique of b(4) above and adjust R217 (fig. 1) for a 100 µs frequency
counter indication (1 percent duty cycle) (R).
NOTE
Due to interaction between adjustments, repeat b(3) through
(6) above if necessary.
(7) Release DUTY CYCLE % pushbutton.
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TB 9-6625-1176-35
(8) Press WIDTH .1m-1m pushbutton and set WIDTH VERNIER dial to 10.
Adjust R216 (fig. 1) for a 1000µs pulse width indication on frequency counter (R).
(9) Set WIDTH VERNIER dial to 1 and adjust R128 (fig. 1) for a 100- µs frequency
counter indication (R).
(10) P ress PERIOD .1 µµ-1µµ and DUTY CYCLE % pushbuttons. Adjust R197 (fig. 1)
for a 80-ns frequency counter indication (R).
Table 7. Duty Cycle Vernier Accuracy Check
Test Instrument Frequency Counter Indications
(ms)
WIDTH (Duty Cycle)
VERNIER Dial Settings
10 8.4 11.6
9 7.55 10.45
8 6.70 9.30
7 5.85 8.15
6 5.00 7.00
5 4.15 5.85
4 3.30 4.70
3 2.45 3.55
2 1.60 2.40
1 .75 1.25
Min Max
11. Pulse Amplitude and Characteristics
a. Performance Check
(1) Position controls as listed in (a) through (g) below
(a) PERIOD 10µµ-.1m pushbutton pressed.
(b) PULSE POSITION .1µµ-1µµ pushbutton pressed.
(c) DUTY CYCLE % pushbutton released (out).
(d) WIDTH 25n-.1µµ pushbutton pressed.
(e) WIDTH VERNIER dial to 10.
(f) AMPLITUDE 30-100 pushbutton pressed.
(g) AMPLITUDE VERNIER dial to 3 (30V).
(2) Connect equipment as shown in figure 3.
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TB 9-6625-1176-35
NOTE
If an out-of-tolerance condition is noted in (3) or (4) below,
perform b(1) through (7) below.
(3) Oscilloscope will display a pulse with an amplitude between 27 and 33 V. Press
INT LOAD pushbutton. Pulse amplitude will be between 13.5 and 16.5 V.
(4) Repeat technique of (3) above for settings listed in table 8. Oscilloscope will
indicate within specified limits.
(5) Press AMPLITUDE 10-30 pushbutton and set AMPLITUDE VERNIER dial
to 1 (10V).
(6) Using standard measurement technique, measure the rise time and decay time
of the OUTPUT pulse. If the rise time and decay time are not less than 15 ns, perform
b(8) through (21) below.
(7) Set POLARITY switch to NEG and repeat (6) above.
(8) Measure preshoot, overshoot, and ringing of positive and negative OUTPUT
pulse. If measurement is not lest than 5 percent as shown in figure 4, perform b(8) through
(21) below.
b. Adjustments
(1) Position controls as listed in (a) through (j) below:
Table 8. Pulse Amplitude Accuracy Check
Test Instrument Oscilloscope Indications
AMPLITUDE
Range
Pushbuttons Settings Min Max
30-100 10 90 110 45 55
10-30 3 27 33 13.5 16.5
10-30 1 9 11 4.5 5.5
.3-1 3 .27 .33 - - - - - .3-1 10 .9 1.1 - - - - - 1-3 3 2.7 3.3 - - - - - 1-3 1 .9 1.1 - - - - - 3-10 3 2.7 3.3 - - - - - 3-10 4 3.6 4.4 - - - - - 3-10 5 4.5 5.5 - - - - - 3-10 6 5.4 6.6 - - - - - 3-10 7 6.3 7.7 - - - - - 3-10 8 7.2 8.8 - - - - - 3-10 9 8.1 9.9 - - - - - 3-10 10 9 11 - - - - - -
Vernier
Dial
INT LOAD OFF
(V)
INT LOAD ON
(V)
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Figure 4. Preshoot, overshoot, and ringing characteristics.
(a) PERIOD l0m-.1 pushbutton pressed.
(b) PERIOD VERNIER dial to 10.
(c) PULSE POSITION l0n-.1µµ pushbutton pressed.
TB 9-6625-1176-35
(d) PULSE POSITION VERNIER dial to 1.
(e) DUTY CYCLE % pushbutton pressed.
(f) DUTY CYCLE 1-10 pushbutton pressed.
(g) WIDTH VERNIER dial to 5.
(h) AMPLITUDE 30-100 pushbutton pressed.
(i) AMPLITUDE VERNIER dial to 3 (30V).
(j) INT LOAD pushbutton released (out).
(2) Set R462 (fig. 2) fully cw and adjust R457 (fig. 2) for a 29-V pulse amplitude
display on oscilloscope (R).
(3) Set AMPLITUDE VERNIER dial to 10 and adjust R462 for a 105-V pulse
amplitude display on oscilloscope (R).
(4) Repeat (2) and (3) above for best in tolerance condition.
(5) Press AMPLITUDE 10 - 30 pushbutton and set AMPLITUDE VERNIER dial
to 1. Oscilloscope will display a pulse amplitude between 9 and 11 V.
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TB 9-6625-1176-35
(6) Set AMPLITUDE VERNIER dial fully ccw. If oscilloscope does not display a
pulse amplitude of less than 10 V, readjust R457.
(7) Press AMPLITUDE 3 -10 pushbutton and set AMPLITUDE VERNIER dial
fully cw. If oscilloscope does not display a pulse amplitude greater than 10 V, readjust
R462.
(8) Position controls as listed in (a) through (h) below:
(a) PERIOD lµµ-10µµ pushbutton pressed.
(b) PERIOD VERNIER dial to 10.
(c) PULSE POSITION l0n-.1µµ pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 1.
(e) WIDTH VERNIER dial to 2.5.
(f) AMPLITUDE 10-30 pushbutton pressed.
(f.1)DUTY CYCLE pushbutton pressed.
(f.2)WIDTH 25N-.lµµ pushbutton pressed.
(g) AMPLITUDE VERNIER dial to 3 (30V).
(h) POLARITY switch to POS.
(9) Adjust R480 (fig. 2) for a 25-ns pulse width indication on oscill oscope (R).
(10) Position controls as listed in (a) through (e) below:
(a) WIDTH .lµµ-lµµ pushbutton pressed.
(b) WIDTH VERNIER dial to 2.
(c) INT LOAD pushbutton pressed.
(d) AMPLITUDE 30 - 100 pushbutton pressed.
(e) AMPLITUDE VERNIER dial to 10 (50V).
(11) Adjust R436 and R408 (fig. 2) for fastest risetime display indication on
oscilloscope (R).
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(12) Adjust R419 (fig. 2) for minimum overshoot on oscilloscope display (R).
TB 9-6625-1176-35
(13) Observe oscilloscope risetime, overshoot, and ringing. If risetime is not less than
15 ns, and overshoot and ringing less than 5 percent, readjust R419, R436, and R408 (fig.
2).
(14) Press AMPLITUDE 10 - 30 pushbutton and set AMPLITUDE VERNIER dial
to 3.
(15) Adjust C501 (fig. 5) for an overshoot equal to pulse ringing (R).
(16) Adjust R487 and R421 (fig. 2) for flat pulse top, and adjust C504 (fig. 5) for
optimum overshoot and ringing (R).
(17) Observe oscilloscope risetime, overshoot, and ringing. If risetime is not less than
15 ns, and overshoot and ringing less than 5 percent, readjust C501, (fig. 5) C504, R421,
and R487 (fig. 2) for optimum pulse.
(18) Release INT LOAD pushbutton and repeat technique of (17) above.
(19) Press AMPLITUDE 30-100 pushbutton and set AMPLITUDE VERNIER dial
to 10 (100V). Repeat technique of (17) above.
(20) Press INT LOAD pushbutton and repeat technique of (17) above.
(21) Press AMPLITUDE .3-1 pushbutton and adjust C514 (fig. 1) for minimum
ringing (R).
Figure 5. A3 (load board) - adjustment locations.
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TB 9-6625-1176-35
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TB 9-6625-1176-35
12. Trigger Output and Double Pulse
a. Performance Check
(1) Position controls as listed in (a) through (g) below:
(a) PERIOD .1µµ-1µµ pushbutton pressed.
(b) PERIOD VERNIER dial to 2.
(c) PULSE POSITION 10n-.1µµ pushbutton pressed.
(d) PULSE POSITION VERNIER dial to 1.
(e) AMPLITUDE 3-10 pushbutton pressed.
(f) AMPLITUDE VERNIER dial to 3.
(g) INT LOAD pushbutton released (out).
(2) Connect TRIG OUTPUT to oscilloscope (A3) CH 1 input, using cable and
termination (B6 and B9). Oscilloscope will display a pulse amplitude greater than 2.5 V
and a pulse width of 10 ns.
(3) Connect equipment shown in figure 3.
(4) Position controls as listed in (a) through (h) below:
(a) PERIOD VERNIER dial to 5.
(b) PULSE POSITION .1µµ-1µµ pushbutton pressed.
(c) PULSE POSITION VERNIER dial to 2.
(d) WIDTH 25n-.1µµ pushbutton pressed.
(e) WIDTH VERNIER dial to 2.
(f) AMPLITUDE 30-100 pushbutton pressed.
(g) AMPLITUDE VERNIER dial to 5.
(h) DELAY/ADVANCE/DOUBLE PULSE switch to DOUBLE PULSE.
(5) Adjust PULSE POSITION VERNIER dial slowly ccw. Oscilloscope will still
display both pulses when minimum separation of 100 ns is reached.
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TB 9-6625-1176-35
(6) Set PERIOD VERNIER dial to 2 and press AMPLITUDE 3-10 pushbutton.
Oscilloscope will display corresponding double pulse.
b. Adjustments. No adjustments can be made.
13. External Trigger Level and Sensitivity
a. Performance Check
(1) Position controls as listed in (a) through (f) below:
(a) MODE EXT TRIG pushbutton pressed.
(b) PULSE POSITION 10n-.1µµ pushbutton pressed.
(c) PULSE POSITION VERNIER dial to 1.
(d) WIDTH .1µµ-1µµ pushbutton pressed.
(e) WIDTH VERNIER dial to 10.
(f) DELAY/ADVANCE/DOUBLE PULSE switch to DELAY.
(2) Connect equipment as shown in figure 6.
(3) Adjust signal generator (A4) controls for an output of 100 kHz at 11 V p-p.
(4) Vary EXT INPUT LEVEL control from fully ccw to fully cw and observe that
oscilloscope (A3) CH 1 displays an OUTPUT pulse as the level control is varied within +5V
and -5V limits.
(5) Set SLOPE switch to NEG and repeat (4) above.
b. Adjustments
NOTE
It might be necessary to set the LEVEL vernier slightly off
center position to get trigger on NEG and POS SLOPE. The
arrow of knob should stay within ±1 mm of center position.
(1) Adjust signal generator to 100 kHz and 300-mV p-p display indication on
oscilloscope.
(2) Set EXT INPUT LEVEL control to midrange.
(3) Adjust R19 (fig. 1) until output pulses appear on the oscilloscope.
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(4) Repeat technique of (3) above with SLOPE switch set to NEG.
TB 9-6625-1176-35
Figure 6. Variable trigger - equipment setup.
14. Power Supply
a. Performance Check
(1) Position controls as listed in (a) through (e) below:
(a) AMPLITUDE 3-10 pushbutton pressed.
(b) POLARITY switch to NEG.
(c) MODE EXT TRIG pushbutton pressed.
(d) DUTY CYCLE % pushbutton released (out).
(e) DELAY/ADVANCE DOUBLE PULSE switch to DELAY.
(2) Connect negative input of digital voltmeter (Al) to TP7 (fig. 7) and positive input
to TP1 (fig. 7) using leads (B7). Digital voltmeter will indicate approximately 155 V.
Record digital voltmeter indication.
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TB 9-6625-1176-35
(3) Move positive lead to TP5 (fig. 7). Digital voltmeter will indicate approximately
133 V dc. If the difference between indication recorded in (2) above and this indication is
not between 21.780 and 22.220 V dc, perform b below.
(4) Press AMPLITUDE 30-100 pushbutton. Digital voltmeter will indicate
approximately 263 V dc at TP1 and approximately 241 V dc at TP5.
Figure 7. A4 power supply board - top left center.
(5) Repeat technique of (2) above for settings and indications listed in table 9.
b. Adjustments. Adjust A4 R604 so that the voltage difference between TP1 and TP5
(fig. 7) is 22V ±220 mV (R).
Table 9. Power Supply Check
Test Instrument Digital Voltmeter
Indications (V)
Voltage Test Point Min Max
-5.2 Marked on PC board 4.94 5.46
+15 Marked on PC board 14.25 15.75
-15 Marked on PC board 14.25 15.75
+5 Marked on PC board 4.75 5.25
15. Final Procedure
a. Deenergize and disconnect all equipment and reinstall protective cover on TI.
b. Annotate and affix DA Label/Form in accordance with TB 750-25.
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TB 9-6625-1176-35
By Order of the Secretary of the Army:
JOHN A. WICKHAM, JR.
General, United States Army
Chief Of Staff
Official:
R. L. DILWORTH
Brigadier General, United States Army
The Adjutant General
Distribution:
To be distributed in accordance with DA Form 12-34C, Block No. 319, requirements for
calibration procedures publications.
PIN: 0476751-000
*U S GOVERNMENT PRINTING OFFICE 1991-531-038/40233
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