CN203479987U - Automatic test circuit for conversion amplifier - Google Patents
Automatic test circuit for conversion amplifier Download PDFInfo
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- CN203479987U CN203479987U CN201320613055.0U CN201320613055U CN203479987U CN 203479987 U CN203479987 U CN 203479987U CN 201320613055 U CN201320613055 U CN 201320613055U CN 203479987 U CN203479987 U CN 203479987U
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- conversion amplifier
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Abstract
The utility model discloses an automatic test circuit for a conversion amplifier, which comprises a conversion amplifier (2). The conversion amplifier (2) is respectively connected with the following circuits through leads: a phase-shifting adjusting circuit (4), a zeroing circuit (5), a measuring circuit (6), a half-wave fine-adjusting circuit (8) and an input signal conditioning circuit (9). The automatic test circuit for the conversion amplifier has the following advantages: simple method, high versatility, simple operation, etc. Not only is test cost of the conversion amplifier reduced, but also test efficiency is improved. Test error is reduced, and a problem of performing automatic test on the conversion amplifier is settled. The automatic test circuit for the conversion amplifier settles the following problems in performing routine test on various conversion amplifiers: low test efficiency, low test precision, easy conversion amplifier damage, etc., wherein the problems are caused by no universal automatic test facility and manual conversion amplifier test through a measuring instrument.
Description
Technical field
The utility model belongs to conversion amplifier automatization testing technique field, relates in particular to a kind of conversion amplifier automatic test circuit.
Background technology
Conversion amplifier mostly is hybrid circuit, to the test of conversion amplifier be mainly test its total null voltage, linearity error, phase shift range and-test of 3dB broadband parameter, but dissimilar conversion amplifier internal circuit configuration is different, its method of testing is factory according to self products characteristics and application request design, does not also form at present general automation method of testing.Factory is by measurement instrument manual test conversion amplifier, and the method not only efficiency is low, and measuring accuracy is not high, also very easily damages conversion amplifier.
Summary of the invention
The technical problems to be solved in the utility model: a kind of conversion amplifier automatic test circuit is provided, to solve the various conversion amplifiers of conventionally test, there is no general automatic test means, only by measurement instrument manual test conversion amplifier, the testing efficiency causing is low, measuring accuracy is low, also very easily damages the problems such as conversion amplifier.
Technical solutions of the utility model:
A conversion amplifier automatic test circuit, it comprises conversion amplifier, this conversion amplifier is connected with phase shift regulating circuit, zeroing circuit, metering circuit, half-wave trimming circuit and input signal regulating circuit wire respectively.
Phase shift regulating circuit comprises digital regulation resistance, the resistance centre tap end of digital regulation resistance is connected with low resistance end, high resistance end is connected with the contact of single-pole single-throw (SPST) relay, resistance increase control end reduces control end with resistance and is connected with the control module CBIT of hybrid circuit test platform, and the cutter point of single-pole single-throw (SPST) relay is connected with the external phase shift potentiometer end of conversion amplifier.
Zeroing circuit comprises turn knob potentiometer and double-pole single-throw (D.P.S.T.) relay, two contacts in turn knob potentiometer two ends and double-pole single-throw (D.P.S.T.) relay are connected, centre tap end is connected with the negative supply input end of conversion amplifier, and two cutter points of double-pole single-throw (D.P.S.T.) relay are connected with two zeroing ends of conversion amplifier.
Half-wave trimming circuit comprises half-wave fine setting digital regulation resistance, the first keyswitch and the second keyswitch, the resistance increase control end of half-wave fine setting digital regulation resistance reduces control end with resistance and is connected with one end of the second keyswitch with the first keyswitch respectively, low resistance end is connected with the half-wave fine setting end of conversion amplifier with resistance centre tap end ground connection, high resistance end, the other end ground connection of the first keyswitch and the second keyswitch.
Input signal regulating circuit comprises high-frequency transformer, the 3rd dpdt relay, the second digital regulation resistance, elementary and the number of secondary turns of high-frequency transformer is than being 3:1, the output terminal that meets AC signal source ACS of the primary coil hybrid circuit test platform of high-frequency transformer, secondary coil cross connection is on four contacts of the 3rd dpdt relay, another cutter of cutter point ground connection of the 3rd dpdt relay o'clock is connected with the low resistance end of the second digital regulation resistance, the resistance increase control end of the second digital regulation resistance reduces control end with resistance and is connected with the user control unit CBIT of hybrid circuit test platform, resistance centre tap end is connected with low resistance end, high resistance end is connected with tested conversion amplifier AC signal input end.
The beneficial effects of the utility model:
The disclosed conversion amplifier of the utility model automatic test circuit, digital regulation resistance and relay have been applied, under STS8105A hybrid circuit test macro is controlled, automatically complete the switching of test circuit, reduced manual intervention, improved test speed, the disclosed conversion amplifier of the utility model automated testing method can complete paratransit's amplifier major parameter test, the STS8105A hybrid circuit test macro of take is test platform, reduce testing apparatus quantity, thereby avoided complicated connection.Compared to existing technology, the method that the utlity model has is simple, highly versatile, the feature such as simple to operate, the cost that has not only reduced the test of conversion amplifier, has improved testing efficiency, has reduced test error, solved a conversion amplifier automatic test difficult problem, having solved the various conversion amplifiers of conventionally test does not have general automatic test means, and only, by measurement instrument manual test conversion amplifier, the testing efficiency causing is low, measuring accuracy is low, also very easily damages the problems such as conversion amplifier.
accompanying drawing explanation:
Fig. 1 is the utility model automatic test circuit and tested conversion amplifier composition frame chart;
Fig. 2 is the utility model automatic test circuit and tested conversion amplifier wiring schematic diagram;
Fig. 3 is the utility model conversion amplifier test component theory of constitution block diagram.
embodiment:
For making the purpose of this utility model, technical scheme and advantage clearer, referring to accompanying drawing the LB8023 of take conversion amplifier automatic test, be embodiment, the utility model is further described.
As shown in Figure 1, Figure 2, Figure 3 shows:
A conversion amplifier automatic test circuit, it comprises conversion amplifier 2, this conversion amplifier 2 is connected with phase shift regulating circuit 4, zeroing circuit 5, metering circuit 6, half-wave trimming circuit 8 and input signal regulating circuit 9 wires respectively.
Described phase shift regulating circuit 4 comprises digital regulation resistance 41, the resistance centre tap end of digital regulation resistance 41 is connected with low resistance end, high resistance end is connected with the contact of single-pole single-throw (SPST) relay 42, resistance increases control end and reduces control end with resistance and be connected with the control module CBIT of hybrid circuit test platform 1, and the cutter point of single-pole single-throw (SPST) relay 42 is connected with the external phase shift potentiometer end end pin numbers 19 that converts amplifier 2.
Half-wave trimming circuit 8 comprises half-wave fine setting digital regulation resistance 81, the first keyswitch 82 and the second keyswitch 83, the resistance of half-wave fine setting digital regulation resistance 81 increase control end and resistance reduce control end respectively with the first keyswitch 82 and the second keyswitch 83, the half-wave fine setting end of low resistance end and resistance centre tap end ground connection, high resistance end and conversion amplifier 2 is connected.
Input signal regulating circuit 9 comprises high-frequency transformer 91, the 3rd dpdt relay 92, the second digital regulation resistance 93, elementary and the number of secondary turns of high-frequency transformer 91 is than being 3:1, the primary coil of high-frequency transformer 91 connects the output terminal of AC signal source ACS, secondary coil cross connection is on four contacts of the 3rd dpdt relay 92, another cutter of cutter point ground connection of the 3rd dpdt relay 92 o'clock is connected with the low resistance end of the second digital regulation resistance 93, the resistance increase control end of the second digital regulation resistance 93 reduces control end with resistance and is connected with user control unit CBIT, resistance centre tap end is connected with low resistance end, high resistance end is connected with tested conversion amplifier 2 AC signal input ends.
Conversion amplifier automated testing method, it comprises the steps:
Step 1, tested conversion amplifier 2 is connected according to foregoing description with automatic test circuit 3;
The method of testing of the direct current output zero potential of conversion amplifier is: by the AC signal input end end pin of tested conversion amplifier No. 22 and reference signal input end end pin number 18 and 20 ground connection, guarantee that input signal is zero, utilize the high-power DC power supply PVI of STS8105A hybrid circuit test macro 1 that provide ± 15V of conversion amplifier 2 working power is provided, the voltage that high-accuracy voltage table PVM measures the DC output end end pin numbers 10 of conversion amplifier 2 is direct current output total null voltage Vo.
The method of testing of the linearity error of conversion amplifier is: with the AC signal source ACS of STS8105A hybrid circuit test macro 1, provide ac input signal and the benchmark sinusoidal signal of 16kHz, a 6V for converting amplifier 2, regulate the external half-wave fine setting digital regulation resistance 81 of conversion amplifier, make to convert an amplifier detuner output terminal end pin number complete half-wave voltage signal of 13 outputs; Regulating uniformly voltage magnitude that the second digital regulation resistance 93 makes input exchange signal even variation thereupon, is 2 to record uniformly 10 alternating voltage effective value V with the A.C. voltmeter ACM of STS8105A hybrid circuit test macro 1 converting amplifier input end end pin No. 2
i1, V
i2v
i10, with STS8105A hybrid circuit test macro 1 D.C. voltmeter PVM, at conversion amplifier 2 DC output end end pin numbers 10, record uniformly and input 10 corresponding DC voltage value V
o1, V
o2v
o10; 10 alternating voltage effective values and 10 DC voltage value substitution Bessel Formulas are calculated to forward linearity error; Adhesive the 3rd dpdt relay 92, tests reverse linear degree error according to the method described above.
The method of testing of conversion amplifier phase shift range is: with STS8105A hybrid circuit test macro 1, for converting amplifier 2, provide an ac input signal and reference signal, regulate the external phase shift potentiometer of conversion amplifier 2, with the time measuring unit QTMU of STS8105A hybrid circuit test macro 1, measure the reference signal input end end pin numbers 20,18 of conversion amplifier, observe with phase shifter the maximum time interval that end is held pin number 17 signals, by the time interval, calculate the phase differential of two waveforms, thereby obtain phase shift range.
The method of testing of-three dB bandwidth is: the AC signal source ACS of STS8105A hybrid circuit test macro 1 is that the logical output terminal end pin of the band of conversion amplifier numbers 15 provides the AC signal of a frequency and amplitude, with the D.C. voltmeter PVM of STS8105A hybrid circuit test macro 1, measure the voltage of the DC output end end pin numbers 10 of conversion amplifier, slow rising AC signal frequency, until convert 0.707 times that amplifier 2 DC output end end pin number 10 voltage drops are former measuring voltage, the be-three dB bandwidth of frequency values that now AC signal changes.
Claims (5)
1. a conversion amplifier automatic test circuit, it comprises conversion amplifier (2), it is characterized in that: this conversion amplifier (2) is connected with phase shift regulating circuit (4), zeroing circuit (5), metering circuit (6), half-wave trimming circuit (8) and input signal regulating circuit (9) wire respectively.
2. a kind of conversion amplifier automatic test circuit according to claim 1, it is characterized in that: described phase shift regulating circuit (4) comprises digital regulation resistance (41), the resistance centre tap end of digital regulation resistance (41) is connected with low resistance end, high resistance end is connected with the contact of single-pole single-throw (SPST) relay (42), resistance increase control end reduces control end with resistance and is connected with the control module CBIT of hybrid circuit test platform (1), and the cutter point of single-pole single-throw (SPST) relay (42) is connected with the external phase shift potentiometer end of conversion amplifier (2).
3. a kind of conversion amplifier automatic test circuit according to claim 1, it is characterized in that: zeroing circuit (5) comprises turn knob potentiometer (51) and double-pole single-throw (D.P.S.T.) relay (52), (52) two contacts in turn knob potentiometer (51) two ends and double-pole single-throw (D.P.S.T.) relay are connected, centre tap end is connected with the negative supply input end of conversion amplifier (2), and two cutter points of double-pole single-throw (D.P.S.T.) relay (52) are connected with two zeroing ends of conversion amplifier (2).
4. a kind of conversion amplifier automatic test circuit according to claim 1, it is characterized in that: half-wave trimming circuit (8) comprises half-wave fine setting digital regulation resistance (81), the first keyswitch (82) and the second keyswitch (83), the resistance increase control end of half-wave fine setting digital regulation resistance (81) reduces control end with resistance and is connected with one end of the second keyswitch (83) with the first keyswitch (82) respectively, low resistance end and resistance centre tap end ground connection, high resistance end is connected with the half-wave fine setting end of conversion amplifier (2), the other end ground connection of the first keyswitch (82) and the second keyswitch (83).
5. a kind of conversion amplifier automatic test circuit according to claim 1, it is characterized in that: input signal regulating circuit (9) comprises high-frequency transformer (91), the 3rd dpdt relay (92), the second digital regulation resistance (93), elementary and the number of secondary turns of high-frequency transformer (91) is than being 3:1, the primary coil of high-frequency transformer (91) connects the output terminal of the AC signal source ACS of hybrid circuit test platform (1), secondary coil cross connection is on four contacts of the 3rd dpdt relay (92), a cutter point ground connection of the 3rd dpdt relay (92), another cutter point is connected with the low resistance end of the second digital regulation resistance (93), the resistance increase control end of the second digital regulation resistance (93) reduces control end with resistance and is connected with the user control unit CBIT of hybrid circuit test platform (1), resistance centre tap end is connected with low resistance end, high resistance end is connected with tested conversion amplifier (2) AC signal input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320613055.0U CN203479987U (en) | 2013-09-30 | 2013-09-30 | Automatic test circuit for conversion amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320613055.0U CN203479987U (en) | 2013-09-30 | 2013-09-30 | Automatic test circuit for conversion amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN203479987U true CN203479987U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320613055.0U Expired - Lifetime CN203479987U (en) | 2013-09-30 | 2013-09-30 | Automatic test circuit for conversion amplifier |
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| CN (1) | CN203479987U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487745A (en) * | 2013-09-30 | 2014-01-01 | 贵州航天计量测试技术研究所 | Automatic testing circuit of transforming amplifier and testing method |
| CN108037436A (en) * | 2017-12-08 | 2018-05-15 | 贵州振华风光半导体有限公司 | A kind of method of heavy current pulse test |
-
2013
- 2013-09-30 CN CN201320613055.0U patent/CN203479987U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487745A (en) * | 2013-09-30 | 2014-01-01 | 贵州航天计量测试技术研究所 | Automatic testing circuit of transforming amplifier and testing method |
| CN103487745B (en) * | 2013-09-30 | 2016-08-31 | 贵州航天计量测试技术研究所 | A kind of conversion amplifier automatic test circuit and method of testing |
| CN108037436A (en) * | 2017-12-08 | 2018-05-15 | 贵州振华风光半导体有限公司 | A kind of method of heavy current pulse test |
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Granted publication date: 20140312 |
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