CN103487745A - Automatic testing circuit of transforming amplifier and testing method - Google Patents
Automatic testing circuit of transforming amplifier and testing method Download PDFInfo
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- CN103487745A CN103487745A CN201310459409.5A CN201310459409A CN103487745A CN 103487745 A CN103487745 A CN 103487745A CN 201310459409 A CN201310459409 A CN 201310459409A CN 103487745 A CN103487745 A CN 103487745A
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Abstract
The invention discloses an automatic testing circuit of a transforming amplifier. The automatic testing circuit of the transforming amplifier comprises the transforming amplifier (2). The transforming amplifier (2) is respectively connected with a phase shifting adjusting circuit (4), a zero setting circuit (5), a measuring circuit (6), a half-wave fine adjusting circuit (8) and an input signal adjusting circuit (9) through wires. The testing method comprises the following steps that the transforming amplifier (2) to be tested is connected with the automatic testing circuit (3); the waveform output end of the transforming amplifier is connected with an oscilloscope; a computer and the oscilloscope are connected with an STS8105A mixed circuit testing system (1); the direct-current output zero potential of the transforming amplifier is tested; the linearity error of the transforming amplifier is tested; the phase shifting range of the transforming amplifier is tested; the -3dB bandwidth is tested. The automatic testing circuit of the transforming amplifier and the testing method have the advantages that the method is simple, generality is good, and operation is easy. By the adoption of the automatic testing circuit of the transforming amplifier and the testing method, the cost of testing of the transforming amplifier is reduced, the testing efficiency is improved, and the testing errors are reduced.
Description
Technical field
The invention belongs to conversion amplifier automatization testing technique field, relate in particular to a kind of conversion amplifier automatic test circuit and method of testing.
Background technology
The 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 difference, its method of testing is factory according to self products characteristics and application request design, does not also form at present the 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 the conversion amplifier.
Summary of the invention
The technical problem to be solved in the present invention: a kind of conversion amplifier automatic test circuit and method of testing are provided, there is no general automatic test means to solve the various conversion amplifiers of conventionally test, only by measurement instrument manual test conversion amplifier, the testing efficiency caused is low, measuring accuracy is low, also very easily damages the problems such as conversion amplifier.
Technical solution of the present invention:
A kind of conversion amplifier automatic test circuit, it comprises the 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.
The phase shift regulating circuit comprises digital regulation resistance, the resistance centre tap end of digital regulation resistance is connected with the low resistance end, the 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, the 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.
The 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 an end of the first keyswitch and the second keyswitch respectively, the 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.
The 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, the 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 the low resistance end, the high resistance end is connected with tested conversion amplifier AC signal input end.
Described conversion amplifier automated testing method, it comprises the steps:
Step 1, tested conversion amplifier is connected with the automatic test circuit;
Step 2, will convert amplifier waveform output terminal and be connected with oscillograph;
Step 3, computing machine is connected with STS8105A hybrid circuit test macro with oscillograph;
Step 4, converted the test of the direct current output zero potential of amplifier;
The test of step 7, carry out-three dB bandwidth;
The method of testing of the direct current output zero potential of described conversion amplifier is: by the AC signal input end of tested conversion amplifier and reference signal input end grounding, guarantee that input signal is zero, the high-power DC power supply PVI that utilizes STS8105A hybrid circuit test macro is provide ± 15V of conversion amplifier working power, and the VD that high-accuracy voltage table PVM measures the conversion amplifier is direct current output total null voltage Vo.
The method of testing of the linearity error of described conversion amplifier is: with the AC signal source ACS of STS8105A hybrid circuit test macro, 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 of conversion amplifier, make to convert a complete half-wave voltage signal of amplifier detuner output terminal output; Regulate uniformly voltage magnitude that the second digital regulation resistance makes input exchange signal even variation thereupon, with the A.C. voltmeter ACM of STS8105A hybrid circuit test macro, record uniformly 10 alternating voltage effective value V converting amp.in
i1, V
i2v
i10, with the D.C. voltmeter PVM of STS8105A hybrid circuit test macro, at conversion amplifier DC output end, 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 the forward linearity error; Adhesive the 3rd dpdt relay, test 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, for the conversion amplifier, provide an ac input signal and reference signal, regulate the external phase shift potentiometer of conversion amplifier, measure the reference signal input end of conversion amplifier and the maximum time interval that phase shifter is observed end signal with the time measuring unit QTMU of STS8105A hybrid circuit test macro, calculate the phase differential of two waveforms by the time interval, thereby obtain phase shift range.
The method of testing of-three dB bandwidth is: the logical output terminal of band that the AC signal source ACS of STS8105A hybrid circuit test macro is the conversion amplifier provides the AC signal of a suitable frequency and amplitude, measure the DC output end voltage of conversion amplifier with the D.C. voltmeter PVM of STS8105A hybrid circuit test macro, slow rising AC signal frequency, until convert 0.707 times that amplifier DC output end voltage drop is former measuring voltage, the be-three dB bandwidth of frequency values that now AC signal changes.
Beneficial effect of the present invention:
Conversion amplifier automatic test circuit disclosed by the invention, 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, conversion amplifier automated testing method disclosed by the invention can complete the test to conversion amplifier major parameter, the STS8105A hybrid circuit test macro of take is test platform, reduce testing apparatus quantity, thereby avoided complicated connection.Compared to existing technology, the present invention has that method is simple, highly versatile, the characteristics such as simple to operate, has not only reduced the cost of conversion amplifier test, has improved testing efficiency, has reduced test error, has solved a conversion amplifier automatic test difficult problem.
the accompanying drawing explanation:
Fig. 1 is automatic test circuit of the present invention and tested conversion amplifier composition frame chart;
Fig. 2 is automatic test circuit of the present invention and tested conversion amplifier wiring schematic diagram;
Fig. 3 is that the present invention converts amplifier test component theory of constitution block diagram.
embodiment:
For make purpose of the present invention, technical scheme, and advantage clearer, referring to accompanying drawing the LB8023 of take conversion amplifier automatic test, be embodiment, the present invention is described in more detail.
As shown in Figure 1, Figure 2, Figure 3 shows:
A kind of 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 the low resistance end, the 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 and the external phase shift potentiometer end end pin that converts amplifier 2 numbers 19 is connected.
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, the 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 the low resistance end, the 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;
Step 2, will convert amplifier waveform output terminal 13 and be connected with oscillograph with 14;
Step 3, computing machine is connected with STS8105A hybrid circuit test macro 1 with oscillograph;
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 the forward linearity error; Adhesive the 3rd dpdt relay 92, test 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 conversion amplifier 2, provide an ac input signal and reference signal, regulate the external phase shift potentiometer of conversion amplifier 2, measure the reference signal input end end pin numbers 20,18 of conversion amplifier with the time measuring unit QTMU of STS8105A hybrid circuit test macro 1, observe with phase shifter the maximum time interval that end is held pin number 17 signals, calculate the phase differential of two waveforms by the time interval, 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, measure the voltage of the DC output end end pin numbers 10 of conversion amplifier with the D.C. voltmeter PVM of STS8105A hybrid circuit test macro 1, 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 (10)
1. a conversion amplifier automatic test circuit, it comprises conversion amplifier (2), and 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 the low resistance end, the 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, the 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 an end of the second keyswitch (83) with the first keyswitch (82) respectively, low resistance end and resistance centre tap end ground connection, the 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), the 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 the low resistance end, the high resistance end is connected with tested conversion amplifier (2) AC signal input end.
6. a conversion amplifier automated testing method, it comprises the steps:
Step 1, tested conversion amplifier (2) is connected with automatic test circuit (3);
Step 2, will convert amplifier waveform output terminal and be connected with oscillograph;
Step 3, computing machine is connected with STS8105A hybrid circuit test macro (1) with oscillograph;
Step 4, converted the test of the direct current output zero potential of amplifier;
Step 5, converted the test of the linearity error of amplifier;
Step 6, converted the test of the phase shift range of amplifier;
The test of step 7, carry out-three dB bandwidth.
7. a kind of conversion amplifier automated testing method according to claim 6, it is characterized in that: the method for testing of the direct current output zero potential of described conversion amplifier is: by the AC signal input end of tested conversion amplifier (2) and reference signal input end grounding, guarantee that input signal is zero, the high-power DC power supply PVI that utilizes STS8105A hybrid circuit test macro (1) is provide ± 15V of conversion amplifier (2) working power, and the VD that high-accuracy voltage table PVM measures conversion amplifier (2) is direct current output total null voltage Vo.
8. a kind of conversion amplifier automated testing method according to claim 6, it is characterized in that: the method for testing of the linearity error of described 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 a complete half-wave voltage signal of amplifier detuner output terminal output; Regulate uniformly voltage magnitude that the second digital regulation resistance (93) makes input exchange signal even variation thereupon, with the A.C. voltmeter ACM of STS8105A, record uniformly 10 alternating voltage effective value V converting amplifier (2) input end
i1, V
i2v
i10, with STS8105A D.C. voltmeter PVM, at conversion amplifier (2) DC output end, 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 the forward linearity error; Adhesive the 3rd dpdt relay (92), test reverse linear degree error according to the method described above.
9. a kind of conversion amplifier automated testing method according to claim 6, it is characterized in that: the method for testing of conversion amplifier phase shift range is: with hybrid circuit test macro (1), for conversion amplifier (2), provide an ac input signal and reference signal, regulate the external phase shift potentiometer of conversion amplifier (2), measure the reference signal input end of conversion amplifier and the maximum time interval that phase shifter is observed end signal with the time measuring unit QTMU of hybrid circuit test macro (1), calculate the phase differential of two waveforms by the time interval, thereby obtain phase shift range.
10. a kind of conversion amplifier automated testing method according to claim 6, it is characterized in that: the method for testing of-three dB bandwidth is: the logical output terminal of band that the AC signal source ACS of hybrid circuit test macro (1) is the conversion amplifier provides the AC signal of a frequency and amplitude, measure the DC output end voltage of conversion amplifier with the D.C. voltmeter PVM of hybrid circuit test macro (1), slow rising AC signal frequency, until convert 0.707 times that amplifier (2) DC output end voltage drop is former measuring voltage, be-the three dB bandwidth of frequency values that now AC signal changes.
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| CN103487745B CN103487745B (en) | 2016-08-31 |
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Cited By (3)
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| CN107422247A (en) * | 2017-08-03 | 2017-12-01 | 过成康 | A kind of signal amplifier automatic test circuit |
| CN107422246A (en) * | 2017-08-03 | 2017-12-01 | 过成康 | A kind of signal amplifier automated 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 |
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