Power Supply Current

The preamplifier has three power supply voltages; +8 Volts, -6 Volts, and +12 Volts. The current used by each supply can be calculated using the equations:

TEST JIG # 3 ICD JIG #5

+8V Current (I) =V @ TP#4 / 100 +8V Current (I) =V @ TP#4 / 100

-6V Current (I) =V @ TP#5 / 100 -6V Current (I) =V @ TP#5 / 100

+12V Current (I) =V @ TP#6 / 100 +12V Current (I) =V @ TP#6 / 100

The steps to conduct the test are as follows:

1. Based on the preamplifier species to be tested, position internal switches in the proper position per label on the inside cover of the test jig housing. Refer to Figure 5 for a detailed explanation of the switch bank positions. OMIT THIS STEP FOR SPECIES I ONLY. WHEN TESTING SPECIES I, BE SURE TO USE THE ICD TEST JIG.
2. Connect the test jig to a DVM per Figure 3.
3. The main power ON / OFF switch should be UP. (The front panel LEDs should illuminate RED.)
4. Select LOCAL or REMOTE operation. Refer to Figure 1 for external switch and connector locations. Refer to the Basic Instructions document for selection steps. The preferred way to measure the voltage for this test is in the LOCAL mode.
5. Place the preamplifier to be tested (DUT) into the zero insertion force socket (ZIF) component side facing the operator.
6. Slide the ZIF lever toward the operator.
7. Push the red button (Push-to-Test; PTT) and hold it down for LOCAL operation. For REMOTE operation, provide an external logical high signal with a pulse duration long enough to measure the voltage on the test points, ~30s.
8. Record the voltage measurement at Test Points # 4, #5, and #6 from the DVM.
9. Release the PTT button for LOCAL operation. For REMOTE operation, a logical low will end the test.
10. Calculate the current using the equations stated above and compare to the test specification window in Figure 11.

The LED display on the front panel of the test unit should correspond to the pass / fail status of the calculated current values. If a current is out of the tolerance range stated in the specifications, the corresponding LED will illuminate RED as well as the CURRENTS LED. Refer to Figure 2 for LED indication explanations.

Output Rise Time

The rise time of the preamplifier at Test Point #3, will be measured. The rise time is measured between 20% and 80% of the voltage Pk-Pk. It is assumed that the Current Test has been performed before this test. (Species switch banks have been selected as well as REMOTE or LOCAL operation.)

The steps to conduct the test are as follows:

1. Download the RISETIME.SET file into the scope. Connect the test jig to an oscilloscope per Figure 4.
2. Place the preamplifier to be tested (DUT) into the zero insertion force socket (ZIF) component side facing the operator.
3. Slide the ZIF switch toward the operator.
4. Momentarily depress the PTT button for LOCAL operation or provide an external logical high for REMOTE operation.
5. The LED display will momentarily illuminate green if all tests pass. (If the PTT button is held down or the external logical high is kept active, the LEDs will illuminate green until the button is released or the external signal goes low.)
6. Record the Rise Time and Voltage measurement from Test Point #3 as shown on the front panel of the scope. Refer to Figure 6 (Species A-H) or Figure 7 (Species I) for plot examples.
7. Compare the measured values with the specification sheet.
8. Remove the DUT by sliding the ZIF lever away from the operator.
9. Record the Rise Time measurement from Test Point #3 as shown on the front panel of the scope. Refer to Figure 6 (Species A-H) or Figure 7 (Species I) for plot examples. Compare the measured value with the specification sheet, Figure 11.

Output Fall time

The fall time of the preamplifier at Test Point #3 will be measured. The fall time is measured between 80% and 29% of the Voltage Peak to Peak. It is assumed that the Current Test, Rise Time and Voltage Pk-Pk test has been performed prior to this test. (Species switch banks have been selected as well as REMOTE or LOCAL operation.)

The steps to conduct the test are as follows:

1. Connect the test jig to an oscilloscope per Figure 4. Download FALLTIME.SET into the oscilloscope.
2. Place the preamplifier to be tested (DUT) into the zero insertion force socket (ZIF) component side facing the operator.
3. Slide the ZIF switch toward the operator.
4. Momentarily depress the PTT button for LOCAL operation or provide a logical high signal for REMOTE operation.
5. Record the fall time measurement from Test Point #3 as shown on the front panel of the scope.
6. Remove the DUT by sliding the ZIF lever away from the operator.
7. Record the Fall Time measurement from Test Point #3 as shown on the front panel of the scope. Refer to Figure 8 (Species A-H) or Figure 9 (Species I) for plot examples. Compare the measured value with the specification sheet, Figure 11.

The Undershoot/Overshoot test begins with the generation of a STANDARD curve. This curve is composed from the average outputs of preamplifiers that are deemed "OK". "OK" is defined as those units that pass the Current Test, Rise Time and Voltage Pk-Pk Test , and Fall Time Test. A STANDARD curve will be generated for each Species.

The steps to generate the STANDARD (S) curve are as follows:

1. Based on the preamplifier species to be tested, position internal switches in the proper position per label on the inside cover of the test jig housing.
2. Connect the test jig to an oscilloscope per Figure 4. Download U_OSTND.SET into the oscilloscope.
3. Place a preamplifier in the ZIF socket, sliding the ZIF lever toward the operator.
4. Momentarily depress the PTT button for LOCAL operation. Provide an external logical high 100ns wide pulse for REMOTE operation.
5. Remove the preamplifier.
6. Repeat steps 3, 4, and 5 until 20 preamplifiers have been cycled.

• DO NOT RESET THE SCOPE IN ANY WAY DURING STEPS 3-6. THE U_OSTND.SET FILE IS ACCUMULATING AN AVERAGE OF ALL DATA POINTS.

1. Save the resulting curve on the floppy disk provided. Figure 10 shows a plot (Example: U_OSTND) of what this curve should look like. The table to left of the plot is a sample of the tabular form of the curve.
2. Convert the U_OSTND curve into tabular format. We use Wavestar, a program available from Tektronix.
3. Calculate the average baseline absolute value during the time interval t=0 to t=50ns.
4. Add the baseline value to all points on the U_OSTND curve.
5. Calculate 20% of the Voltage Pk-Pk on the U_OSTND curve. Refer to Figure 10 text for a more detailed example.
6. Subtract 60ns from the time stamp associated with the 20% Vpk-pk point; this is

the first data point of the STANDARD curve.

• Note the corresponding sample number (of 2000 sample points).

The last data point of the STANDARD curve will be 500ns later.

• Note the corresponding sample number (of 2000 sample points).

1. Calculate the sum of all voltage values between the first sample point and the last sample point, inclusive; å f (S).

• The STANDARD curve has now been prepared. A normalization factor will now be calculated for each preamplifier.

1. Download U_ORISE.SET into the scope.
2. Place a preamplifier in the ZIF socket, sliding the ZIF lever toward the operator.
3. Momentarily depress the PTT button for LOCAL operation. Provide an external logical high 100ns wide pulse for REMOTE operation.
4. Display this curve in tabular form. This is the rising edge curve for an individual preamp (I).
5. Calculate the average baseline absolute value during the time interval t=0= to t =50ns.
6. Add the baseline value to all points on the Individual curve.
7. Calculate the sum of all voltage values between the first and last sample numbers that were noted in the STANDARD curve; å f (I).
8. Calculate the Normalization Factor (NF) by the equation å f (S) / å f (I).

• The test results are found by completing the next few calculations.