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--- university:courses:alm1k:alm-lab-transformers [22 Dec 2017 16:40] – created Doug Mercer
+++ university:courses:alm1k:alm-lab-transformers [26 Aug 2022 19:21] (current) – [Step Up and Step Down Configurations] Doug Mercer
@@ Line 1: / Line 1: @@
-======Activity: Transformers======
+======Activity: Transformers, For ADALM1000======
 =====Objective:=====
@@ Line 95: / Line 95: @@
 Solder-less breadboard, and jumper wire kit\\
 HPH1-1400L 6 winding transformer\\
- 100 Ω resistors
+ 100 Ω resistor (brown black brown)\\
+47 Ω resistors (yellow purple black)
 =====Directions:=====
-Build the circuit shown in figure 2 on your solder-less breadboard. You will be using this setup to measure the frequency response of the multi-winding transformer in three different configuration with 1:1 primary to secondary turns ratios. The two red arrows indicate where to connect the source and load resistors for the configuration where one coil is used for the primary and secondary. The blue arrows are for the configuration where two coils in series are used for the primary and secondary. The green arrows are for the configuration where three coils in series are used for the primary and secondary.
+The first step is to measure the winding inductance of the HPH1-1400L.
+Wire the HPH1-1400L 6 winding Inductor as shown in figure 1 with the 6 windings connected in series. To use the ALICE desktop Impedance Analyzer tool to measure the inductance an external reference resistor is used. Connect the CHA pin of the ALM1000 to one end of R<sub>EXT</sub> and the other end of R<sub>EXT</sub> to the CHB pin of the ALM1000 and to pin 1 of the HPH1-1400L.
 {{ :university:courses:alm1k:alm-transformers-fig1.png?500 |}}
-<WRAP centeralign> Figure 2, transformer test circuit </WRAP>
+<WRAP centeralign>Figure 2, Winding Inductance measurement setup</WRAP>
+Set AWG Channel A Max to 3.5, Min to 1.5, Freq to 6250 Hz. When you open the Impedance Analyzer window for the first time it automatically sets Channel A to SVMI mode, Shape to Sine and Channel B to Hi-Z mode.
+One at a time connect the fixed 2.5 V pin on the ALM1000 to pins 2, 3, 6, 10, 11 and 12 of the HPH1-1400L. Record the measured inductance when 1, 2, 3, 4, 5 and 6 windings are connected in series.
+The second step is to measure the frequency response of the HPH1-1400L configures as a 1:1 transformer with different numbers of windings connected in series and compare these measurements to the calculated frequency response based on the impedances you just measured.
+Modify the circuit on your solder-less breadboard to look as shown in figure 3. You will be using this setup to measure the frequency response of in three different configurations with 1:1 primary to secondary turns ratios. The two red arrows indicate where to connect the source and load resistors for the configuration where one winding is used for the primary and secondary. The blue arrows are for the configuration where two coils in series are used for the primary and secondary. The green arrows are for the configuration where three coils in series are used for the primary and secondary.
+{{ :university:courses:alm1k:alm-transformers-fig2.png?500 |}}
+<WRAP centeralign>Figure 3, Transformer test circuit</WRAP>
 =====Hardware Setup:=====
@@ Line 116: / Line 131: @@
 How do your measurements compare to the winding inductance specified in the manufacturer's datasheet?
+How do does the measured frequency response compare to your calculated response based on the measured winding inductance?
 =====Step Up and Step Down Configurations=====
-Connect to the transformer for a 1:2 step up configuration (red arrows) and a 2:1 step down configuration as shown in figure 3.
+Connect to the transformer for a 1:2 step up configuration (red arrows) and a 2:1 step down configuration as shown in figure 4.
-{{ :university:courses:alm1k:alm-transformers-fig2.png?500 |}}
+{{ :university:courses:alm1k:alm-transformers-fig3.png?500 |}}
 <WRAP centeralign> Figure 3 Step Up (red) and Step Down (blue) connections </WRAP>
-Use the impedance matching formula to calculate the appropriate value for R<sub>L</sub> in both cases. Repeat the same frequency sweeps using the Network Analyzer tool. Be sure to export the data to a .csv file for further analysis in either Excel or Matlab. Compare the measured low frequency roll off points with those measures in the 1:1 configurations from figure 2.
+Use the impedance matching formula to calculate the appropriate value for R<sub>L</sub> in both cases. Repeat the same frequency sweeps using the Network Analyzer tool. Be sure to export the data to a .csv file for further analysis in either Excel or Matlab. Compare the measured low frequency roll off points with those measures in the 1:1 configurations from figure 3.
 For additional credit calculate the correct R<sub>L</sub> for other possible step up and step down ratios possible with these 6 winding transformers such as 1:3, 2:3, 3:1, 3:2 etc. Measure and report the data for as many different configurations as you have time for.
@@ Line 131: / Line 148: @@
 **For Further Reading:**
-http://en.wikipedia.org/wiki/Electromagnetic_coil\\
+[[adi>en/analog-dialogue/raqs/raq-issue-82.html|Transformers: They’re Not All Boat Anchors]]\\
-http://www.coilcraft.com/pdfs/doc157_SigXfrmApp.pdf
+[[wp>Electromagnetic_coil|Electromagnetic coil]]\\
+[[http://www.coilcraft.com/pdfs/doc157_SigXfrmApp.pdf|Signal Transformer Application and Specification]]\\
+[[https://www.allaboutcircuits.com/technical-articles/simulating-non-linear-transformers-in-ltspice/|Simulating Non-linear Transformers in LTspice]]
 **Return to Lab Activity [[university:courses:alm1k:alm_circuits_lab_outline|Table of Contents]].**

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