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NSSPCM Test Documents
Test #1: Output Power Measurement
Purpose:
The objective of this test is to measure the output voltage, average output power, and maximum output power. This test will indicate if
the system meets engineering specifications 1, 2, and 3. A range of 10 to 12.5DC voltages are supplied to the NSSPCM to ensure the
system can operate properly over a range of possible battery voltages.
Equipment Used:
HP 34401A Digital Benchtop Multimeter, S/N: US36091339
Cornell-Dubilier Electronics RDA31 Decade Resistor Box, S/N: N/A
Populated and functional NSSPCM printed circuit board
NSSPCM Output Power Cable
Test leads
Procedure:
1) Connect a multimeter to the decade resistance box and measure the resistance for each value listed in table 1. Record the
resistance values in table 2.
2) Connect the NSSPCM to a DC power supply and set the input voltage to 10V with current limit of 0.8A. Before turning on the
power supply, connect the 2-meter output voltage supply cable to the PCB.
3) Turn on DC power supply and measure the output voltage from the 2-m power cable and ensure it is 12V.
4) Apply a load by connecting the end of the output cable to the decade box. Measure the output voltage for each of the listed
load values in table 1. Calculate the output current from the measured output voltage and load resistance. Read the input
current from the power supply read out. Record all measurements in table 2.
5) Repeat steps 2 through 4 for supply voltages of 11V, 12V, and 12.5V. Record all measurements in tables 3, 4 and 5. Copy
measured resistance values from table 2 to tables 3-5.
6) Calculate power values with measured voltage and current values. Compare results with acceptance criteria.
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NSSPCM Test Documents
Acceptance Criteria:
Output Voltage= 12V ±1.2V (10.8 ≤ Vout ≤ 13.2) – For each load value from 1W to 5W
Output Power = > 1W (for ES2: Average Power) and >4W (for ES3: Maximum Power)
Table 1: Test Voltage, Current, Resistance, and Power Values
VIN (V)
---------
VOUT (V)
IOUT (A) Resistance (Ω) PowerOUT (W)
12.0
0.13
96.0
1.5
12.0
0.17
72.0
2.0
12.0
0.21
58.0
2.5
12.0
0.25
48.0
3.0
12.0
0.29
41.0
3.5
12.0
0.33
36.0
4.0
12.0
0.38
32.0
4.5
12.0
0.42
29.0
5.0
Resistance values rounded to nearest whole number
Test Results:
Table 2: Recorded Measurement Values (10VIN)
VIN (V)
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
IIN (A) VOUT (V)
0.235
11.997
0.291
11.990
0.345
11.983
0.403
11.976
0.459
11.970
0.514
11.964
0.568
11.958
0.617
11.953
IOUT (A)
0.125
0.167
0.207
0.250
0.293
0.332
0.374
0.411
Resistance (Ω)
95.936
71.746
57.770
47.871
40.894
35.992
32.013
29.115
PowerOUT (W)
1.500
2.004
2.486
2.996
3.504
3.977
4.467
4.907
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NSSPCM Test Documents
Table 3: Recorded Measurement Values (11VIN)
VIN (V)
11.0
11.0
11.0
11.0
11.0
11.0
11.0
11.0
IIN (A) VOUT (V)
0.219
12.000
0.271
11.992
0.321
11.986
0.374
11.978
0.424
11.969
0.472
11.962
0.523
11.955
0.568
11.948
IOUT (A)
0.125
0.167
0.207
0.250
0.293
0.332
0.373
0.410
Resistance (Ω)
95.936
71.746
57.770
47.871
40.894
35.992
32.013
29.115
PowerOUT (W)
1.501
2.004
2.487
2.997
3.503
3.976
4.464
4.903
Table 4: Recorded Measurement Values (12VIN)
VIN (V)
12.0
12.0
12.0
12.0
12.0
12.0
12.0
12.0
IIN (A) VOUT (V)
0.207
12.002
0.255
11.995
0.300
11.987
0.348
11.979
0.396
11.971
0.438
11.964
0.485
11.957
0.527
11.950
IOUT (A)
0.125
0.167
0.207
0.250
0.293
0.332
0.374
0.410
Resistance (Ω)
95.936
71.746
57.770
47.871
40.894
35.992
32.013
29.115
PowerOUT (W)
1.502
2.005
2.487
2.998
3.504
3.977
4.466
4.905
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NSSPCM Test Documents
Table 4: Recorded Measurement Values (12.5VIN)
VIN (V)
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
IIN (A) VOUT (V)
0.203
12.012
0.249
12.003
0.292
11.995
0.337
11.986
0.383
11.975
0.424
11.968
0.468
11.960
0.509
11.953
IOUT (A)
0.125
0.167
0.208
0.250
0.293
0.333
0.374
0.411
Resistance (Ω)
95.936
71.746
57.770
47.871
40.894
35.992
32.013
29.115
PowerOUT (W)
1.504
2.008
2.491
3.001
3.507
3.980
4.468
4.907
Tester Name:___Stephen Giannotti____
Date (yyyy-mm-dd):_2012-05-08_
Pass/Fail:__Pass____
Reviewed By:___Jacob Emenheiser_______
Date(yyyy-mm-dd): _2012-05-08_
Pass/Fail:__Pass____
Comments:
*See plot on page 5 (graphed data)
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NSSPCM Test Documents
Plotted output voltage values versus load values for 10V, 11V, 12V, and 12.5V DC inputs.
NSSPCM Output Voltage with Connected Load
12.020
12.010
12.000
Output Voltage (V)
11.990
10V Input
11V Input
11.980
12V Input
11.970
12.5V Input
11.960
11.950
11.940
0.000
20.000
40.000
60.000
80.000
100.000
120.000
Load Value (Ohm)
5