BK Precision 4011A Betriebsanleitung PDF herunterladen (Seite 18)

Laboratory 3: Computer Analysis

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4. Notice that, except for meters, the circuit of Figure 3.1 is electrically identical to the circuit in

the B2 SPICE Analog Tutorial #1, which you did in the Pre-Lab assignment.

Vmeter

Figure 3.3: Schematic from B2 SPICE Analog Tutorial #1

5. Create a table showing the three sets of values for currents and node voltages: (a) your calcu-

lation from Ohm’s law and Kirchhoff’s laws; (b) your measured values; and (c) the predic-

tion from B2 SPICE. Compare the results and discuss any discrepancies.

Parameter Manual Calc Measured B2 SPICE

Current, I

Voltage, Node 1

Voltage, Node 2

6. You can display the node voltages, currents, and device power, predictions on the circuit dia-

gram in B2 SPICE. (These options were also available within the screens to set up the .OP

(OPERATING POINT) simulation.) To choose what is displayed, open your circuit for Analog

Tutorial #1 in B2 SPICE, then follow these steps:

a) Select the menu item view | steady state display options

b) Choose whichever of the items you want to show on the circuit diagram:

SHOW VOLTAGE TEXT shows the voltages at the nodes.

SHOW CURRENT TEXT shows the current through each component, with + and - signs

shown to indicate direction of current flow.

SHOW POWER TEXT shows the power consumed by each device.

SHOW NODE VOLTAGES highlights the nodes by changing the color of the wires at the

nodes. The brightness of the color is roughly proportional to the magnitude of the

node voltage.

SHOW BRANCH CURRENTS shows arrows pointing in the direction of current flow in

the branches. The size of each arrow head is roughly proportional to the magni-

tude of the branch current.

c) Once the text values are displayed, you can move them on screen by dragging the text

box with your mouse.

d) To clear all these state displays select VIEW | CLEAR STATE DISPLAY.

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BK Precision 4011A Betriebsanleitung Seite 18