TR1900 series injection transformer_Electronic measuring instruments_Product

TR1900 series injection transformer

The TR1900 series injection transformers are available in two different bandwidths, both of which are made with materials that are superior to most other injection transformers, resulting in greatly improved bandwidth, durability, and overall performance. A wideband injection transformer is a special type of transformer that is perfect for inserting signals into various electronic circuits, such as control loops or switching power supplies. Injection transformers are used with oscilloscopes or vector network analyzers to simplify the evaluation of the stability of electronic control circuits.

Features:
• Perform loop analysis test on switching power supply
• Uses an oscilloscope for Bode diagram measurements
• Wide frequency, low distortion, high accuracy
• 600VCATI isolation

Setup of the measurement environment

The digital oscilloscope works with the Angstrom signal isolation injection transformer to perform loop analysis on the switching power supply. It includes the following sections:
A 10Ω injection resistor is connected to the feedback circuit, and the signal generator interface of the digital oscilloscope is connected to the BNC interface of the isolated injection transformer.
The swept sine wave signal output by the built-in waveform generator of the oscilloscope is connected in parallel to both ends of the injection resistor through the isolation transformer, and the probes of the two analog channels of the digital oscilloscope are connected to measure the injection and output terminals of the swept frequency signal.

Choose the right injection point

To ensure that the loop gain measurement is equal to the actual value, the appropriate location point needs to be selected:
The first step in loop analysis is to find the injection point of the interfering signal, which is usually inverse
Between the sampling point of the feedback and the output voltage point. An injection resistor is inserted in series at the injection point, and in order not to affect the normal operation of the power supply, the resistance value of the injection resistor can be selected between 5~100Ω.

Enable the "Fra" Bird Chart feature

Open the Analyze menu and select Frequency Response Analysis Measurements.

Set the swept signal

The amplitude/frequency setting key sets the parameters through the numeric keypad, and the traversal frequency of the loop system is usually 1/20 to 1/5 of the switching frequency, and the swept frequency range should be set near the traversal frequency

Set the input and output sources

According to the actual circuit connection, Select the analog channel number used by the input source for the injection end, respectively. Select the analog channel number used by the output source for the output.

Start the loop analysis test

In the Bode Chart function settings menu, the Run Analysis key is initially displayed as "pop up Bode Wave window", press the Run Analysis key to start drawing the Bode Chart

View the Bird chart measurements

The Bird diagram is beginning to be drawn, At this point, we just need to wait slowly, and the running process is as follows:

View the Bird chart measurements

After the Bird diagram is drawn, You can view the Bord diagram in the "FRA" function window, as shown in the following figure:

Model	TR1900A	TR1901A
Ratio	1:1
Termination impedance	5Ω
Available bandwidth	1HZ~5MHz	10HZ~45MHz
Isolation voltage	600V/CATII
Isolation capacitors	390pF/1KHz (typ.)	150pF/1KHz (typ.)
DC current	10mA
Working environment	0~50℃ / 5 ~80%RH
Maximum altitude	6000 Ft
Weight	0.33kg	0.27kg
Dimensions	110X90X50mm

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