JPS5920690Y2 - Multi-phenomenon scope - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a multi-phenomenon oscilloscope.

More specifically, the present invention relates to a multi-phenomenon oscilloscope that can simultaneously display observed waveforms in non-delayed sweep and delayed sweep on a cathode ray tube, or simultaneously display observed waveforms in delayed sweep with different delay times.

The time base circuit of a conventional oscilloscope having a 1 to 1 trigger delay sweep function is constructed as shown in FIG.

In Fig. 1, 1 is a trigger level adjustment circuit, 2 is a trigger delay circuit, 3 is a no-delay/hot-rolled sweep switch, and 4 is a trigger level adjustment circuit.
is a sweep gate circuit, 5 is a sawtooth wave generation circuit,
By switching the changeover switch 3, only one of the observed waveform swept without delay or the observed waveform of the delayed portion delayed by delayed sweep was displayed on the cathode ray tube.

Therefore, for example, partial waveforms such as logic signals or composite video signals can be displayed separately, or a series of continuous observed waveforms can be enlarged so that, for example, the rising and falling parts of a pulse can be displayed simultaneously on a cathode ray tube. I couldn't do anything to display it.

The present invention is based on the above considerations, and consists of a non-delay swept observed waveform and a delayed swept observed waveform on a cathode ray tube.
Another object of the present invention is to provide an oscilloscope that can simultaneously display observed waveforms that have been delayed and swept with different delay times.

FIG. 2 is a block diagram of an embodiment of the present invention, showing an example of a two-phenomenon oscilloscope.

As shown in FIG. 2, the two-phenomenon oscilloscope of this embodiment includes a second channel attenuator 6, a vertical preamplifier 7, a second channel attenuator 8, a vertical preamplifier 9, Phenomenon switching circuit 10 for switching modes, phenomenon switching circuit 1
a channel switching circuit 11 for switching the outputs of the vertical preamplifiers 7 and 9 by 0; Vertical main amplifier 12, synchronous signal switching circuit 13 that selects and fixes the synchronous signal input or switches the synchronous signal input in synchronization with the operation of the phenomenon switching circuit 10.
,)・Riga level adjustment circuit 1, l-'Jga control circuit 14
, a trigger delay circuit 15, a delay switching circuit 16, a sweep gate circuit 17, a sawtooth wave generation circuit 5, a horizontal width amplification circuit 18, and a cathode ray tube 19.

The delay switching circuit 16 is switched by the output of the phenomenon switching circuit 10 in synchronization with channel switching.

The trigger control circuit 14 is a circuit that controls the l-'J signal in relation to the sweep, and the trigger control circuit 14 controls the l-'J signal during the sweep period so that the trigger signal input to the trigger delay circuit does not become unrelated to the sweep period. It operates so that no signal is applied to the delay circuit 15.

Note that 1-1 and 15-1 are a trigger level adjuster and a delay time setter, respectively.

Now, if the input wave shown in Figure 3a is applied as the observed wave to the input terminals of the first channel and the second channel, the trigger signal is extracted from the signal of channel 1, and the trigger level adjustment circuit 1 adjusts the trigger point from 1 to the trigger point. If it is set correctly and the sweep is performed without delay, the trigger signal from the trigger level adjustment circuit 1 directly triggers the sweep gate circuit 17, and the sawtooth wave generation circuit 5 starts the sweep without delay as shown in FIG. do.

In the case of delayed sweep, the trigger signal from the trigger level adjustment circuit 1 enters the trigger delay circuit 15 through the l-trigger control circuit 14 and triggers the trigger delay circuit 15.

As the trigger delay circuit 15, for example, a monostable multi-by-break or timer circuit can be used.

Further, the application of the trigger signal to the trigger delay circuit 15 is associated with the sweep period by the trigger control circuit 14 as described above, and no trigger signal is applied to the trigger delay circuit 15 during the sweep period.

Next, when a trigger signal is input to the trigger delay circuit 15, the trigger is applied to the sweep gate circuit 17 after a delay time T1 set by the trigger delay circuit 15 as shown in FIG. As shown, a sawtooth wave is generated with a delay of time T1.

On the other hand, at this time, the delay switching circuit 16 is switched by the phenomenon switching circuit 10 in synchronization with channel switching.

Therefore, on the cathode ray tube 19, the waveform of section A in FIG. 3a, which is swept without delay, and the waveform of section B in FIG. 3, which is delayed and swept by time T1, are simultaneously displayed.

Of course, it is also possible to fix the display to only the non-delay swept waveform or only the delayed swept waveform.

Next, the trigger control circuit 14, +-1>ga delay circuit] 5,
Specific circuit examples of the delay switching circuit 16 and the sweep gate circuit 17 will be described.

This concrete circuit is as shown in FIG.

The delay switching circuit 16 inverts the output Q of the phenomenon switching circuit 10 (flip-flop 0) and the output Q of the phenomenon switching circuit 10 through a Nant gate 25 which receives the output of the switch 24 that selects no delay or delay of channel 2. A slope setting circuit C whose inputs are the outputs of the inverter 26, the output of the inverter 26, and the output of the switch 23 which selects no delay/delay of channel 1, and the outputs of the NAND game I/27, NAND games 1 to 25 and 27. is the same type as the slope setting circuit C, and includes the output of the slope setting circuit C, the output of the trigger level adjustment circuit 1, and the delay circuit 15.
It consists of a no-delay/delay switching circuit whose input is the output of .

The non-delay/delay switching circuit is Nando Game I/29.31
and 32, and an inverter 30.

The output of the delay switching circuit 16 is the Schmidts I-) trigger circuit 20.
is output to.

When the switches 23 and 24 are on, they correspond to the selection of delayed sweep, and when they are off, they correspond to the selection of non-delayed sweep.When the output Q of the phenomenon switching circuit 10 is at a high potential, channel 1 is selected, and the channel switching circuit 11 selects the channel 1 when the output Q of the phenomenon switching circuit 10 is at a high potential. Channel 2 is selected when the output Q of No. 10 is at a high potential.

The sweep gate circuit 17 is a JK foot-flop (hereinafter a flip-flop will be referred to as FF) as in the conventional case.

) 33, an inverter 34, and a hold-off circuit 35 consisting of, for example, a timer circuit, and is triggered by the output of the Schmidts trigger circuit 20.

The trigger control circuit 14 is the FF 33 of the sweep gate circuit 17.
A gate 1 is constructed of an inverter 36 which receives the output Q of the gate as input, a NAND gate 137 which receives the output of the hold-off circuit 35 and the output of the inverter 36 as input, and an inverter 38 which inverts the output of the NAND gate 1-37. -Circuit E and FF
It consists of 39.

In addition, the trigger delay circuit 15 is a monostable multivibrator 4.
0, and 41 is an l-rigger delay circuit on/off switch.

Monostable multi-bi break 40 has external variable resistor 4
A delay time setter 15-1 consisting of a variable resistor 42 and a time constant of the capacitors 43, 44 or 45 is connected to the delay time setter 15-1.

Therefore, the slope setting circuit C of the delay switching circuit 16 is the output Q of the phenomenon switching circuit 10 applied to the NAND games 1 to 25.
When the output Q of the phenomenon switching circuit 10 is high, the output of the switch 24 is output as is from the Nandt gate 28, and when the output Q of the phenomenon switching circuit 10 is high, the output of the switch 23 is outputted as is from the Nandt gate 28.

Similarly, the delay/non-delay switching circuit outputs either the output of NAND game I-28 or the output of trigger level adjustment circuit 1 when the potential is high;
When the output of the trigger delay circuit 15 is at a low potential, the output of the trigger delay circuit 15 is directly output from the NAND gate 132.

Therefore, when the observed wave of channel 1 is selected by the phenomenon switching circuit 10 and output to the vertical main amplifier 12, depending on the setting of the switch 23, when the switch 23 is off, the I/Riga level adjustment circuit 1) Riga signal directly,
The signal is output without delay and applied to the sweep gate circuit 17 at the falling edge of the trigger signal through the Schmitt trigger circuit 20, and the sweep is started without delay.

Also, when the switch 23 is on, the trigger level adjustment circuit 1
The trigger signal triggers the FF 39 of the trigger control circuit 14, and the output Q of the FF 39 triggers the monostable multivibrator 40 of the trigger delay circuit 15 to set the delay time setter 1.
A positive pulse with the time width set in 5-1 is output to the no-delay/delay switching circuit, and the positive pulse is shaped by the Schmitt trigger circuit 20 and applied to the FF 33. The sweep gate circuit 17 is activated at the falling edge.

Therefore, the sweep gate circuit 17 operates with a delay of the delay time set by the delay time setter 15-1, and a delayed sweep is performed.

Further, when the observed wave of channel 2 is selected by the phenomenon switching circuit 10 and outputted to the vertical main amplifier 12, the operation according to the setting of the switch 24 can be explained in the same way as in the above case.

On the other hand, the gate circuit E of the control circuit 14 generates a low potential output during the sweep and hold-off period, and outputs a high potential until the start of the tangential sweep at the end of the hold-off period, and the FF39 triggers the monostable multivibrator 40 by the trigger signal from the trigger level adjustment circuit 1 that is input only during the high potential period of the output of the gate circuit E.

Therefore, the trigger signal applied to the trigger delay circuit 15 is associated with the sweep, and no trigger signal enters the trigger delay circuit 15 during the sweep period and during the hold-off period.

Further, the phenomenon switching circuit 10 inverts its output upon completion of the sweep, and switches the channel switching circuit 11 to switch the channel input to the vertical main amplifier 12.

Therefore, when the above is combined, the operation described in the block diagram of FIG. 2 is performed.

For example, if the switch 23 is turned off and the switch 24 is turned on, channel 1 is set to no delay and channel 2 is set to sweep with delay, the observed wave shown in FIG. In this case, portions A and B of FIG. 3a are displayed simultaneously.

Although the case where there is one trigger delay circuit has been described above, the second trigger delay circuit 21 shown by the broken line in FIG.
. . . can be further connected to provide a plurality of trigger delay circuits, and the waveform can be expanded to display waveforms that are delayed by different delay times on the cathode ray tube.

Further, although the above explanation has been made using an example of a two-phenomenon oscilloscope, the same applies to a multi-phenomenon oscilloscope.

Further, an analog switch, relay, digital circuit, etc. may be used as the switch.

As described above, according to the present invention, different parts of a logic signal, a composite video signal, etc. can be separated and displayed simultaneously on a cathode ray tube.

Also, enlarge the part of the continuous observed wave (sweep at high speed)
For example, the rising and falling parts of a pulse wave can be displayed simultaneously on a cathode ray tube, or the first half and the second half of a series of logic signals can be separated and displayed on a cathode ray tube at the same time. You can also do that.

Further, the configuration for this purpose is simple and can be easily implemented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a time-base circuit of a conventional oscilloscope with a delay sweep function. FIG. 2 is a block diagram of an embodiment of the present invention. FIG. 3 is a waveform diagram for explaining the operation of an embodiment of the present invention. FIG. 4 is a specific circuit diagram of 1 to trigger control circuit, trigger delay circuit, delay switching circuit, and sweep gate circuit of an off-scilloscope according to an embodiment of the present invention. 1...Trigger level adjustment circuit, 5...
Sawtooth wave generation circuit, 6 and 8...attenuator,
7 and 9... Vertical preamplifier, 10...
... Phenomenon switching circuit, 11 ... Channel switching circuit, 12 ... Vertical main amplifier, 13 ...
... Synchronous signal switching circuit, 14 ... Trigger control circuit, 15 ... Trigger delay circuit, 16 ...
... Delay switching circuit, 17 ... Sweep gate circuit, 18 ... Horizontal amplifier, 19 ... Cathode ray tube, 20 ... Schmidts Douga circuit, 35
・・・・・・ Hold-off circuit.

Claims (1)

[Scope of utility model registration request] In a multi-phenomenon oscilloscope, a trigger level adjustment circuit, at least one trigger delay circuit connected to an output terminal of the trigger level adjustment circuit, and outputs of the trigger level adjustment circuit and the trigger delay circuit are synchronized with phenomenon switching. a delay switching circuit that switches the output trigger signal from the trigger level adjustment circuit to the trigger delay circuit at least during the sweep period; A multi-phenomenon oscilloscope characterized by comprising a sawtooth wave generation circuit that generates a sweeping sawtooth wave by output.