SU1246018A1 - Frequency spectrum analyzer - Google Patents

Abstract

The invention relates to electrical measuring technology and can be used for measuring and measuring with high accuracy the amplitudes of the harmonic components of periodic signals of complex shape. The purpose of the invention is to reduce the analysis time by reducing the channel calibration time. The analyzer contains a switch 1, an input unit 2, channels 3, 4 and 5. Each of the channels includes series-connected band-pass filter 6, detector 1, integrator 8. In addition, the analyzer contains switch 9, indicator 10, period generator 11, key 12, the binary divider 13, the pulse generator 14, the dividers 15 and 16, the counters 17 and 18, the multiple-input element AND 19, the countable trigger 20, the signal conditioner 23, the reference signal generators 24, 25 and 26 and the keys 27, 28 and 29. The operation of the device is explained in the time diagrams in the description of the invention. 2 Il. o $ (l ezhov ind od od

Description

The invention relates to electrical measuring technology and can be used for measuring and measuring with high accuracy the amplitudes of the harmonic components of the periodic signals of a complex truss.

The purpose of the invention is to reduce the analysis time of the device by mixing the channel calibration time.

Figure 1 presents the block diagram of the analyzer, the frequency spectrum; figure 2 - timing charts of the multi-channel frequency spectrum analyzer.

Multichannel frequency spectrum analyzer consists of commutator

p a 1, input block 2 ,, channels 3-5, each of which contains a series-connected band-pass filter 6, a detector 7 and an integrator 8,:; switch 9, an indicator 10, form1. 11 period1, key 12 , binary unit 13, pulse generator 14, dividers 15 and 16, counters 17 and 18, AND 19 multiple input element, counting trigger 20, interval maker 21, decoder 22, signal maker 23, reference signal generators 24-26

Spacing generator 21 is a shift register that generates output signals shifted relative to the trigger signal (first harmonic signal) for the period n of the harmonics generated

20

mode. The outputs of all bits of counters 17 and 18 are connected to the multiple input circuit And 19, the output of which is a signal (Figure 2e) with equal codes N .. and N .., where

one

N, code

counter 18, the signal from the output of the multi-input element And 19 is fed to the input of the counting trigger 20 and resets the counter 18 to zero.

25

If N

N

f s

that

t, 2-- T g d 1

Therefore, the frequency of the counting trigger will be 30

sch

those. equal to the frequency n of the harmonic isle

counting trigger 20, Shaper 23 — blown signal provided by the channel

The signal represents an assembly, the inputs of which receive, through the keys 27-29, signals from reference signal generators 24-2.

The multichannel frequency spectrum analyzer works as follows.

When measuring individual harmonic components entering the filter inputs of channels 6–5, through the switch 1 and the input unit 2, the signal under investigation .U is fed. . The harmonics selected by filters 6 in each 3–5 (FIG. 2 and, “f) are rectified by the detectors 7 and averaged by the integrators 8. In addition, the voltage from the filter 6 of the channel 3 distributes the first harmonic to the driver 11 periods. When a signal arrives Calibration to the input of the generator 24, the period former 11 generates an interval equal to the period of the first harmonic of the input

eight

signal Ug (Figg). At this time. the key 12 is opened and the impulses of the pulse generator 14 are transmitted to the input of the counter 17 after the divider 15, passing through the binary divider 13.

The number of pulses N received at the counter 7, is proportional to the period m of the harmonics of the signal under study.

AND

la:

 1 P n 2

T - 2

In addition, the signals of the pulse generator 14 are fed to the counter 18, (FIG. 23), operating in continuous

mode. The outputs of all bits of counters 17 and 18 are connected to the multiple input circuit And 19, the output of which is a signal (Figure 2e) with equal codes N .. and N .., where

one

N, code

counter 18, the signal from the output of the multi-input element And 19 is fed to the input of the counting trigger 20 and resets the counter 18 to zero.

If N

N

f s

that

 2-- T d 1

the frequency of the counting trigger

sch

those. equal to the frequency n of the harmonic isle

5p harmonics. In order that the complex signal from the signal generator 23, supplied to calibrate the device, contain n equal amplitudes of harmonics according to a certain program defined by q (by chitier 16, driver 21, decoder 22, control keys 27-29 (FIG. 2, W, j) On which rto-step signals of generators of reference signals,

Thus, during the calibration, the input device 2 through the switch 1 receives a complex signal (Fig, 2n}, containing n equal harmonics of the input signal.

Claims (1)

Invention Formula The frequency spectrum analyzer, containing 55 series-connected first switch and input unit, also n circuits, each of KOTopliDC consists of series-connected 3 12 bandpass filter, detector and integrator, the outputs of which are connected to the inputs of the second switch, whose output is connected to the indicator input, serially connected pulse generator, binary splitter and key, as well as a period generator, the output of which is connected to the second input of the key, first input - with the output of the bandpass filter of one of the p circuits, and the second input - with the output of the calibrated signal source, two counters, outputs through the AND element connected to the input of the counting trigger, the output connected to the first input of the second counter, the second input of which is connected to the output of the pulse generator, characterized in that S  / / / / L / L / / ./ A.. y y y y y V / V y Shlddadadadadallal r ef-l about iz e. XL-lXL lxlxl lx: / I I I I I I I I I I I F 0–3. 1 1 1 1 rn n rn nJlJrrUTJlJTJTJnJlJlJinnn five 60 O five in order to reduce the analysis time, a serially connected divider, a shaper of the intervals and a decoder, three reference signal generators, three additional keys and a signal generator were additionally introduced into it; as well as an additional divider connected between the output of the key and the input of the first counter, while the outputs of the reference signal generators are connected to the input of the first switch via the additional switches and the interval generator, the second inputs of the additional switches are connected to the output of the decoder, and the output of the counting trigger is connected to the input the divider and the second input of the interval maker, I I I I I I I 1 1 1 1 I rn n rn to th Editor N. Yatsola Compiled by A.Orlov Tehred O.Sopko Order 3995/38 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG .. Proofreader E. Sirohman