A+ Seminar Power Workbook for Labs - Keysight...A+ Seminar Power Workbook for Labs The five labs in the Power section of the A+ seminar are meant to exploratory. We encourage you to

A+ Seminar Power Workbook for Labs

The five labs in the Power section of the A+ seminar are meant to exploratory. We encourage you to

explore the different menus and buttons of the DC Power Analyzer and Precision Source/Measure Unit

to achieve your objective. You will find that there are many ways to complete the same task, particularly

with the DC Power Analyzer front panel!

For those of you that want more detailed instructions, this workbook provides step-by-step instructions

for the power labs.

NOTE: Most of the N6705 mainframes used in the A+ seminar are N6705A mainframes which Agilent no

longer sells. The N6705B mainframe is the only DC Power Analyzer mainframe available today from

Agilent. There are a few hardware and cosmetic changes between the old A mainframe and the latest B

mainframe. Some of the major improvements that pertain to the labs are listed here:

- “Autoscale” label under Trigger Level push button knob

- “Marker 1” label under Vertical Offset push button knob

- “Marker 2” label under Horizontal Offset push button knob

- Push button knob indicators

- Back panel rubber grommets to connect to 50 A modules

- Auxiliary DVM connections for N6781A module

Lab #1 will use the Black Box Demo Kit and the N6705 DC Power Analyzer

Lab #1 uses a 12 V fan connected to channel 1 of the black box demo kit. There is a 5 V relay in series

with the fan that must be closed in order to power the fan. This will connect to the N6705 DC Power

Analyzer.

Lab #1: Basic Power Up for a Fan and Relay

1. Connect the black box demo kit wires 1 and 2 to the N6705 front panel channel 1 and 2 output

connection

• Channel 1 on the demo kit is connected to a 12 V fan

• Channel 2 on the demo kit is connected to a 5 V relay

2. Press Meter View repeatedly to toggle between the multi-meter view and the single meter

view. Note the ability to set all voltage and current settings from the multi-meter view and the

additional information seen in single meter view.

3. Return to multi-meter view. Using the arrow keys, highlight the channel 1 voltage setting. Type

“12” and press Enter

4. Press the down arrow key to highlight the channel 1 current setting. Type “1” and press Enter

5. Using the arrow keys, highlight the channel 2 voltage setting. Type “5” and press Enter

6. Press the down arrow key to highlight the channel 2 current setting. Type “1” and press Enter

• Other methods for programming voltage and current

1. Press Settings and type in voltages and currents. Toggle between outputs with

the “Select Outputs” keys

2. Type in voltages and currents in Single Meter View. Toggle between outputs

with “Select Outputs” keys

3. Use Voltage and Current knobs to gradually increase/decrease voltages and

currents. Toggle between outputs with “Select Outputs” keys and use arrow

keys to move between voltages and currents.

7. Turn on the outputs

• Two methods:

1. Press On above channel 1 and 2 outputs so that the key is highlighted

2. Press On below “All Outputs” to turn on all outputs. Make sure no other

channel is connected to a load.

8. Press Meter View to toggle between views and look at the voltage, current, and power readings

• Note: power measurement is reported as a calculation of the voltage x current

measurements

9. Press Settings to explore advanced settings

10. Press Scope View

11. With V1 highlighted on the top screen, press Enter to deselect the V1 trace (uncheck the box)

12. Press the arrow down, and press Enter to select the I1 trace (check the box)

13. Press Properties

• Note: you can select and deselect traces from the Scope Properties screen by toggling

between the outputs with the “Select Outputs” keys and using the arrow keys and Enter

Key

14. Use the arrow keys to highlight the Trigger Source field. Press Enter to display the drop down

menu

15. Use the arrow keys to highlight “Current 1 Level” and press Enter to select

16. Use the arrow keys to highlight the Trigger Level field, type “0.1” A and press Enter


18. Turn the Vertical gain knob under the display labeled “Volts/Div” counter-clockwise so the I1

gain reads “100 mA”

19. Use the Vertical Offset knob under the display to center the waveform on the screen

20. (Time Permitting) Press Scope View repeatedly to toggle between Scope View and Marker View

21. (Time Permitting) Use the Vertical and Horizontal Offset knobs under the display to move the

markers

22. (Time Permitting) Press the Vertical and Horizontal Offset knobs for more options

Lab #1: Questions

Can you see voltage and current measurements from Meter View?

Can you make power measurements?

What is the easiest way to select the traces?

How else could you measure the dynamic current of the fan without a DC Power Analyzer?

Lab #2: Sequencing Power Inputs

Lab #2 uses no connections to the N6705 DC Power Analyzer (open load).

1. Press File

2. Press the arrow up key to highlight “Reset/Recall/Power-On State…” and press Enter

3. Press the arrow up key to highlight “Reset to Defaults (*RST)” and press Enter

4. Unplug all output connections from the front panel of the DC Power Analyzer

5. In multi-meter view, highlight the channel 1 voltage setting, type 5 and press Enter

6. Press the right arrow key to highlight the channel 2 voltage setting, type 4 and press Enter

7. Use the arrow keys to highlight the channel 3 voltage setting, type 3 and press Enter

8. Use the arrow keys to highlight the channel 4 voltage setting, type 2 and press Enter

9. Press Settings twice

• Note: you can also get to the Output On/Off Delays screen by pressing Menu and

navigating to “Source Settings > Output On/Off Delays…”

• The button shortcuts for screens are listed on the right of the Menu items

10. Leave the channel 1 output delay at 0 s

11. Press arrow down, and set the channel 2 output delays to 0.1 s by typing “0.1” and pressing

Enter


Enter


Enter


15. Use the arrow keys and Enter key to select traces V1, V2, V3, V4 (check box) and deselect all

other traces (uncheck box)

16. Turn the Horizontal “Time/Div” knob under the display counter clockwise to “100 ms/d”

17. Turn the Horizontal Offset knob clockwise to move the start point to the 1st inside grid line or

200 ms


19. Use the arrow keys to highlight the Trigger Mode field and press Enter

20. Use the arrow keys to highlight “Triggered” and press Enter

21. Use the arrow keys to highlight the Trigger level field, type “1” and press Enter


23. Press Run/Stop to start the scope

24. Press All Outputs On

Lab #2: Questions

How can you move the voltage traces?

Can you set output off delays?

What happens when you press Scope View while in Scope View mode?

Why is the 2nd voltage trace different than the others?

How would you perform this test without a DC Power Analyzer?

Lab #3 will use the Black Box Demo Kit and the N6705 DC Power Analyzer

Lab #3 uses the speaker in the demo kit on channel 3. Note, a light and a capacitor are also connected to

channel 3. Please ensure both the Light and Capacitor switches are switched off and ONLY the Speaker

switch is set to On. Channel 3 will be connected to the DC Power Analyzer.

Lab #3: Simulating Power Waveforms

1. Press File



4. Connect wire 3 from the black box demo kit to the N6705 front panel channel 3 + and – output

connections

5. Ensure the demo box is switched to “Speaker”

6. Use the arrow keys to highlight the Channel 3 current setting.

7. Type “1” and press Enter

8. Press Arb to view the “Arb Preview” screen

9. Press Arb again to view the “Arb selection screen”

Note: You can use the Select Output keys to change the channel to configure

Note: You should have 11 arbs to select. If you are missing “Constant Dwell (CD)” and

“Sequence”, you are using an older module with old hardware that we do not sell

anymore.

10. Use the arrow keys to highlight “Sine” and press Enter to select it

7. Press Properties

8. Type “1” and press Enter to set V0 to 1 V. This automatically sets V1 to 1 V because the power

supply cannot cross quadrants with positive and negative voltage.

9. Use the arrow keys to highlight the frequency field. Type “440” and press Enter

• 440 Hz is the musical standard for A above middle C

10. Use the arrow keys to highlight the “Continuous” checkbox and press Enter (check the box)

11. Turn on Output 3

12. Press Arb Run/Stop

13. (Extra Credit) Try a different frequency to find a harmony with 440 Hz to make DC Power

Analyzer music!

Lab #3: Questions

What other waveforms could you create with the DC Power Analyzer (check with channel 1 waveforms

to see full list)?

Can you create voltage and current waveforms?

What is a Constant Dwell (CD) waveform?

How could you recreate this test without a DC Power Analyzer and what are its limitations?

Lab #4: Battery Drain Demo Set Up

Lab #4 uses our glass top cased pulsed demo load which simulates various loads on a wireless device.

The switch positions indicated in the diagram above simulates a ~125 mA transmit pulse, ~250 uA

standby currents, and ~125 uA sleep currents.

Lab #4: Battery Drain Analysis

1. Press File



4. Set the channel 1 voltage by pressing “9” and press Enter

5. Press the arrow down key, type “1”, and press Enter to set the current

6. Select output 4 by pressing 4 under “Select Output”

7. Press Settings

8. Use the arrow keys to highlight the Voltage field. Type “5” and press Enter

9. Use the arrow keys to highlight “Advanced”. Press Enter

10. Ensure the output is set to 4-wire sense

1. If not, use the arrow keys to highlight the Sense field, press Enter, use the arrow keys to

highlight “4 Wire” and press Enter

11. Use the arrow keys to highlight the “Output Voltage Bandwidth” field and press Enter

12. Use the arrow keys to highlight “High 3 for (7-150 uF)” and press Enter

13. Press On above the output connections on channels 1 and 4 to turn them on

6. Press Scope View

7. Use the arrow keys and Enter key to deselect all traces and to select the I4 trace only (check I4

box)

8. Press Properties

9. Use the arrow keys to highlight the Trigger Source field and press Enter

10. Use the arrow keys to highlight “Current 4 Level” and press Enter

11. Use the arrow keys to highlight the Trigger Level field, type “0.001” A, and press Enter

12. Use the arrow keys to highlight “Marker…” and press Enter

13. Press Enter to deselect “Delta Time” (uncheck box) and use the arrow keys and Enter key to

select “Peak-Peak” (check box)


15. Turn the Horizontal “Time/Div” knob counter clockwise to 200 ms/d.

1. You should see 3 transmit spikes

16. Turn the Vertical Offset knob clockwise to set ground at the middle of the screen

17. Turn the Vertical “Volts/Div” knob clockwise to 200 uA/d while using the Vertical offset knob to

enter the ground to display on the screen

1. TIP: keep ground at the center of the screen

18. Press Scope View to view marker view

19. Use the Offset knobs move m1 and m2. Place them on the first step.

1. What is Ipk-pk on the lowest level step?


21. Use the arrow keys to highlight the Scope Ranges – Current field. Press Enter

22. Use the arrow keys to highlight “Auto” and press Enter


24. Let the scope capture another trace and see the difference of seamless measurement ranging!

Lab #4: Questions

What Ipk-pk did you see with the Auto current measurement range and how does that compare to the

current you measured while in the 3 A current measurement range?

What are the benefits of seamless measurement ranging?

What other operating modes does the N6781A module have?

Lab #5.1: Making a Diode Spot Measurement

1. Turn off the DC Power Analyzer

2. Turn on the B2900 Precision Source/Measure Unit

3. If not already in voltage force mode, push the “Ch 1 Mode” softkey and make sure that

“Voltage” is selected

4. Press the “Ch 1 Source” softkey, use the numeric keypad to enter “2.5”, and press the “Volts”

softkey

5. Press the “Ch 1 Limit” softkey, use the numeric keypad to enter “50”, and press the “mA”

softkey

6. Turn Channel One on by pressing On/Off under Ch 1.

What happens? …You should see the diode turn on (light up). You should see 2.5 V and

some measured current <50 mA displayed on Ch #1

7. Use the knob to move the cursor around the screen until it is on the Ch #1 voltage setting

Pushing the knob once allows you to change the setting on-the-fly.

8. Increase the voltage. What happens when you go too high?

The diode (LED) will draw more current. Once you reach the limit value you have set (50

mA), the numbers become orange to alert you that you are in compliance. Increasing

the set voltage does not change anything after that because you are current limited.

Note that the instrument is measuring both voltage and current during this time, and

that the measured voltage is not matching the set voltage (because you are current

limited).

9. What is the difference between the “Auto” and “Trigger” buttons?

View Button

Softkeys

Trigger performs a single measurement; Auto keeps measuring continuously.

10. If not already in voltage force mode, push the “Ch 1 Mode” softkey and make sure that

“Voltage” is selected

11. Press the “Ch 1 Source” softkey, use the numeric keypad to enter “0”, and press the “Volts”

softkey

Lab #5.2: Making a Diode Sweep Measurement

1. Press View repeatedly to toggle between multi-channel view, single channel view and graph

view. Press View until you display single channel view on channel 1 (pictured above)

2. Make sure the limit is set to 50 mA

If you changed the current limit, go back to Lab 5.1 instruction step 5

3. Press the “More… “ softkey

4. Press the “Show Sweep” softkey once and you will see the above sweep menu appear

If you are displaying the sweep menu then the softkey should say “Hide Sweep” (which

will hide the sweep menu if pressed)

5. Use the knob to move the cursor and highlight “Sweep Parameters”

6. Press the knob once to allow you to scroll though the different sweep parameters

7. Turn the knob to show “LINEAR SINGLE” and press the knob again to make the selection

8. Use the knob to move your cursor to highlight the “Stop” parameter

The “Start” parameter is OK at 0 V.

Sweep Settings Softkeys

9. Press the knob once to select the Stop parameter, use the keypad to enter “3” and press the

“Volts” softkey

10. Press the knob again to finalize the selection

11. Use the knob to move the cursor to highlight the “Points” selection and press the knob once.

12. Use the keypad to enter “61” and press the knob again to finalize the selection.

13. Press View to toggle to the Graph View.

14. Ensure the channel is turned on, and press Trigger.

15. Press the “Autoscale” softkey to the right of the graph

16. (Extra Credit) Change to a log scale on the graph and use the markers to find a specific point on

the graph.

Use the knob to do this. At the top of the graph you can see different axes and their

scales (for both channels). Move the cursor on top of the Y1 axis, press the knob once,

and use the knob or softkeys to select “Log”.

Documents

A+ Seminar Power Workbook for Labs - Keysight...A+ Seminar Power Workbook for Labs The five labs in the Power section of the A+ seminar are meant to exploratory. We encourage you to