Tektronix 7L5 Manual

*TB 9-6625-2005-35

SUPERSEDED COPY DATED 24 APRIL 1981

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR

SPECTRUM ANALYZER

TEKTRONIX, TYPE 7L5 (PL-1391/U)

W/PLUG-IN L1 AND L3

Headquarters, Department of the Army, Washington, DC

16 June 1988

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 TMDE Support Group,

ATTN: AMXTM-LPP, Redstone Arsenal, AL 35898-5400. A reply will be furnished directly to you.

Paragraph Page

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 5

Equipment setup............................................................................. 7 6

Readout verification (L3 plug-in only)................................................ 8 7

Calibrator frequency and amplitude.................................................. 9 7

Sweep triggering............................................................................. 10 10

Dot frequency range and accuracy................................................... 11 11

Display dynamic range.................................................................... 12 13

Display flatness .............................................................................. 13 16

Frequency span accuracy and linearity............................................. 14 18

Reference level accuracy (for L3 plug-in only)................................... 15 19

Sweep rate accuracy....................................................................... 16 21

Displayed frequency stability........................................................... 17 22

Final procedure............................................................................... 18 23

*This bulletin supersedes TB 9-6625-2005-35, 24 April 1981, including all changes.

TB 9-6625-2005-35

SECTION I

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification. This bulletin

provides instructions for the calibration of Spectrum

Analyzer, Tektronix, Type 7L5 (PL-1391/U) w/Plug-in L1

and L3. The manufacturer's manual was used as the

prime data source 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 6 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

Calibrator Frequency range: 500 kHz ± 1 Hz

Output voltage: - 40 dBV ±.15 dB

Display Dynamic range: Log 2 dB/DIV = 16 dB (±.15 dB/dB to 1 dB (max)

Accuracy: Log 10 dB/DIV = 80 dB (±.08 dB/dB to 2 dB (max)

Frequency

span/div Range: 50 Hz to 500 kHz

Accuracy: ± 5%

Sweep timing Range: 0.01 ms to 10 s

Accuracy: ± ≥5%

Dot frequency 0 Hz to 4999.75 kHz (0° to 50°C ±20 Hz + 10-5 dot readout)

Display flatness Frequency range: 20 Hz to 5 MHz

Accuracy: ±0.7 dB (±0.8 dB for L3 plug-in)

TB 9-6625-2005-35

Table 1. Calibration Description - Continued

Test instrument

parameters Performance

specifications

Frequency

span Range: 50Hz to 500 kHz/DIV

Linearity: within 5%

Accuracy: ± 5%

Sweep rate Range: 0.1 ms to 10 s

Accuracy: within 5% of rate selected

Sweep triggering Range: 30Hz to 500 kHz

Level: -1.5 div

Reference level Range L1 L3

-128 dBm to

+21 dBm (50Ω)

-139 dBm to

+10 dBm (600Ω)

Log 2 dB/DIV -128 dBm to

+21 dBm

-141 dBV to

+ 8 dB V (Hi z)

-70 dBm to

+21 dBm (50Ω)

-81 dBm to

+10 dBm (600Ω)

Log 10 dB/DIV -70 dBm to

+21 dBm

-83 dBV to

+8 dBV (Hi Z)

Incremental accuracy When calibrated at -40 dBV in log mode

L1 and L3: Within 0.2 dB/dB with cumulative error of 0.25 dB/10 dB

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-287. 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.

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

TB 9-6625-2005-35

Table 2. Minimum Specifications of Equipment Required

Item Common name Minimum use

specifications Manufacturer and model

(part number)

A1 AC VOLTMETER Frequency range: 500 kHz

Accuracy: 1% Hewlett-Packard, Model 400EL

(7915906)

A2 ATTENUATOR Range: 0 to 90 dB in 10 dB steps

Accuracy: ±0.25% Hewlett-Packard, Model 355D (355D)

A3 ATTENUATOR Range: 0 to 12 dB in 1 dB steps

Accuracy: ±0.25 dB Hewlett-Packard Model 355C

(79108075

A4 AUTOTRANSFORMER Range: 105 to 125 V ac

Accuracy: ±1% General Radio, Model W10MT3AS3 or

Ridge, Model 9020F (7910809)

A5 DIGITAL

VOLTMETER Voltage range: 0 to 20 V dc

Accuracy: ±1% Hewlett-Packard, Model

3490AOPT060

(3490AOPT060)

Dana, Model 5000, or

Dana, Model 5000, w/641

A6 FREQUENCY

COUNTER Range: 499.9995 to 500.005 kHz

Accuracy: 10-6Hewlett-Packard, Model 5345 (MIS-

28754/1 Type 1) w/5355A

A7 OSCILLOSCOPE Must be compatible with TI Tektronix, 7000 series

(to be provided by customer)

A8 OSCILLOSCOPE

CALIBRATOR Markers out: 10 ms to 10 s Ballantine, Model 6126M

(MIS-28714 Type 1

A9 TEST OSCILLATOR Frequency: 10 Hz to 5 MHz

Level accuracy: 1% Hewlett-Packard, Model 652A (MIS-

10224)

A10 VERTICAL

AMPLIFIER Must be compatible with 7000 series

oscilloscope Tektronix, Types 7A15, 7A16, 7A18,

etc.

A11 VARIABLE

ATTENUATOR Range: 0 to 69 dB

Accuracy: From test report Weinschel, Model AF117A-69-34

(AF117A-69-34)

TB 9-6625-2005-35

Table 3. Accessories Required

Item Common name

(official nomenclature) Description

(part number)

B1 ADAPTER BNC T-type, 2 jacks, 1 plug (MS35173-274C)

B2 ADAPTER BNC plug terminations (MS35176-491B)

B3 ADAPTER1N plug to BNC jack (10519457) (UG201A/U)

B4 ADAPTER BNC plug to double banana jacks (7909401) (7907592)

B5 ADAPTER1Single banana jack to alligator clip (7907560)

B6 CABLE 30-in., RG-58/U; double banana plug terminations (7907470)

B7 CABLE124-in., RG-58/U; BNC plug terminations (10519141)

B8 EXTENDER1Tektronix, Model 067-0616-00 (067-0616-00)

B9 LEAD 32-in., single banana plug to test hook (red) (7915941-1)

B10 PROBE (TEST LEAD) 36-in., BNC plug to X10 probe, Tektronix, Type P6106 (11513202-

B11 TERMINATION

(DUMMY LOAD) 50-Ωfeed-through; BNC plug to BNC jack (11048B or 11048C)

B12 TEST LEAD Single banana plug to test hook (SKC-4850-14 or 7916122)

1Two required.

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. Unless otherwise specified, all controls and

control settings refer to the TI.

TB 9-6625-2005-35

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.

NOTE

L3 plug-in switch positions are in

parenthesis.

a. Install TI into center compartments of a

4-compartment or right two compartments of a

3-compartment oscilloscope (A7).

b. Select proper oscilloscope controls to

correspond with plug-in compartments occupied by TI.

c. Connect autotransformer (A4) to oscilloscope.

d. Connect autotransformer to a 115-V ac power

source and adjust controls for a 115-V ac output.

e. Set oscilloscope power switch to on and allow

sufficient time for warmup and stabilization.

f. Position controls as listed in (1) through (15)

below: (1) DOT MKR control fully cow (detent

position). (2) FREQUENCY SPAN/DIV switch to MAX.

(3) RESOLUTION (Hz) switch to COUPLED.

(4) REFERENCE LEVEL VAR control fully

cow (detent position).

(5) BASELINE CLIPPER control fully cw.

(6) REFERENCE LEVEL LOG 10 dB/DIV

pushbutton on.

(7) REFERENCE LEVEL switch to -40 dBV.

(8) REFERENCE LEVEL INPUT BUFFER

pushbutton off.

(9) TRIGGERING SOURCE FREE RUN

pushbutton on.

(10) TRIGGERING MODE NORM pushbutton

on.

(11) DIGITAL STORAGE SAVE A pushbutton

to off. (12) DIGITAL STORAGE MAX HOLD

pushbutton off.

(13) dBm/dBV switch to dBV (plugin module

switch). (14) INPUT TERMNZswitch to 50Q (L3 plug-in

only). (15) TIME/DIV switch to AUTO.

g. Connect CALIBRATOR to plug-in INPUT using

cable (B7).

h.Only perform i through I below if L3 plug-in is

being used.

i. Position controls as listed in (1) through (8)

below: (1) LOG 2 dB/DIV pushbutton on.

(2) FREQUENCY SPAN/DIV control to 2

kHz. (3) RESOLUTION (Hz) control to 3 kHz.

(4) TIME/DIV control to 0.2 s.

(5) DIGITAL STORAGE DISPLAY Aand B

pushbuttons on.

(6) VERT POSITION control adjusted to place

display on the bottom horizontal graticule line.

(7) DOT FREQUENCY control to 500.00 kHz.

(8) LOG 10 dB/DIV pushbutton on.

j. Adjust LOG CAL control for a full screen (8

division) display.

k. Push LOG 2 dB/DIV pushbutton to on and

adjust AMPL CAL control (L3) for a full screen display.

I. Repeat i(8) through kabove until displayed

waveform is 8 vertical divisions.

NOTE

Perform m below if L1 plug-in is

being used.

TB 9-6625-2005-35

m. Position controls as listed in (1) through (10)

below: (1) SWP CAL and HORIZ POSITION controls

adjusted until second and tenth vertical signals are

alined with second and tenth vertical graticule lines

(counted from left edge).

(2) FREQUENCY SPAN/DIV control to 2

kHz.(3) TIME/DIV control to 0.2 s.

(4) DIGITAL STORAGE DISPLAY Aand B

pushbuttons on.

(5) VERT POSITION control adjusted to

place display baseline on bottom horizontal graticule

line. (6) RESOLUTION (Hz) control to 3K.

(7) DOT FREQUENCY CONTROL to 500.00

kHz. (8) LOG CAL control for a fullscreen display.

(9) REFERENCE LEVEL LOG 2dB/DIV

pushbutton on.

(10) AMPL CAL control for a full screen

display.

8. Readout Verification (L3 Plug-in Only)

a. Performance Check

(1) Position controls as listed in (a) through

(b)INPUT TERMNZswitch to 50ΩΩ.

(c)REFERENCE LEVEL control for

+21 dBm.(2) Position INPUT REF switch to dBV and

observe art readout for a +8 dBV indication displayed.

(3) Position INPUT REF switch to dBm/600ΩΩ

and observe crt readout for a +10 dBm indication

displayed.

NOTE

The INPUT connector is a three-

conductor BNC connector with the

outer ring used to detect the

presence of a 10X probe.

(4) Short INPUT outer ring using adapter and

lead (B4 and B12) and observe crt readout for a 20 dB

increase.

b. Adjustments. No adjustments can be made.

9. Calibrator Frequency and Amplitude

a. Performance Check

(1) Connect equipment as shown in figure 1.

(2) Observe frequency counter (A6)

indication. If frequency counter does not indicate

between 499.999 to 500.001 kHz, perform b(1) and (2)

below. (3) Observe digital voltmeter (A5)

indication. If digital voltmeter does not indicate between

.3579 to .3746 V dc, perform b(1) and (3) through (19)

below.

b. Adjustments

(1) Remove TI from oscilloscope and

reconnect to oscilloscope using two extenders (B8).

(2) Adjust Y390 (fig. 2) for a frequency

counter indication of 500.000 kHz.

(3) Remove plug-in module from TI and place

insulating tape (e.g., scotch tape) over pins A13, B13,

A14, B14, A15, and B15 of interface connection (fig. 3).

(4) Reinsert plug-in module in T1.

(5) Connect test oscillator (A9) output (without

the termination) to ac voltmeter (A1), using cable (B7).

(6) Adjust test oscillator controls for an output

frequency of 500 kHz and 10 mV indication on ac

voltmeter.

TB 9-6625-2005-35

Figure 1. Calibrator accuracy - equipment setup.

(7) Disconnect cable from ac voltmeter input

and reconnect to TI input.

(8) Position controls as listed in (a) through

(d) below: (a)DOT FREQUENCY control for 500

kHz. (b)FREQUENCY SPAN/DIV control for

2 kHz. (c)RESOLUTION (Hz) control to 30 k.

(d)LOG 2 dB/DIV pushbutton on.

(9) Adjust REFERENCE LEVEL control to

display signal at center of crt and note signal position

(reference).

(10) Disconnect cable from input and connect

CALIBRATOR output to input, using cable (B7).

(11) Adjust R892 (fig. 2) for a CALIBRATOR

output amplitude as noted in (9) above.

(12) Connect test oscillator output to ac

voltmeter input, using cable (B7) and termination (B11).

TB 9-6625-2005-35

(13) Adjust test oscillator controls for an output

frequency of 500 kHz and 10 mV indication on ac

voltmeter.

(14) Disconnect termination from ac voltmeter

and reconnect test oscillator output without termination

to TI plug-in input.

(15) Adjust REFERENCE LEVEL control to

display signal at center of crt and note signal position

(reference).

(16) Remove screws to swing down IF module

assembly so pin 13 is accessible (fig. 4).

(17) Using lead and adapter (B12 and B5)

short pin (B13) (fig. 4) to chassis ground.

Figure 2. Adjustment locations.

Figure 3. Plug-in module rear connector locations.

(18) Adjust R895 (fig. 2) for a CALIBRATOR

output amplitude as noted in (15) above.

(19) Disconnect equipment setup, short, and

tape from pins.

TB 9-6625-2005-35

Figure 4. IF module swung down to expose internal locations.

10. Sweep Triggering

a. Performance Check

(1) Turn POWER switch of oscilloscope (A7)

to off and install vertical amplifier (A10) in the left

compartment.

(2) Turn POWER switch to on and press

VERT MODE LEFT pushbutton in.

(3) Press TRIG SOURCE LEFT pushbutton in

and connect test oscillator (A9) output to vertical

amplifier CH1 input, using cable and termination (B7 and

B11). (4) Position controls as listed in (a) through

(e) below: (a)DIGITAL STORAGE pushbuttons

off. (b)FREQUENCY SPAN/DIV control for

(c)TRIGGERING SOURCE NORM

pushbutton on. (d)TRIGGERING FREE RUN

pushbutton on. (e)TIME/DIV control to 10 ms.

(5) Adjust test oscillator frequency control for

30 Hz and an amplitude level of 1.5 divisions.

(6) Press TRIGGERING SOURCE INT

pushbutton on and adjust LEVEL/SLOPE control for a

stable triggered display.

(7) Adjust test oscillator frequency control for

500 kHz output and repeat technique of (6) above.

(8) Press TRIGGERING SOURCE FREE

RUN pushbutton on.

(9) Press TRIGGERING MODE SGL SWP

pushbutton and observe that a sweep is initiated on crt.

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