Tektronix TCPA300 SERIES, Instruction Manual

Page: 104 / 205

TCPA300 and TCPA400 Performance Verification
5- 14
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
Current Overload Test
(TCPA300 Only)
This test checks the functionality of the TCPA300 current overload detection
circuit using the setup shown in Figure 5--6. You set the current source to output
the maximum rated current for the probe/amplifier you are testing, and then
increase the current source to a level that engages the overload circuit (the
OVERLOAD LED is on). Then, you repeat the test at the opposite polarity.
This test uses current loops that you make using wire and 3-inch forms. Refer to
page 5--4 for instructions on making the current loops.
Current
source
+
--
5 or 50 turn
current loop,
depending on
probe type
Probe
Output
Current flow
TCPA300 Amplifier
Test oscilloscope
50
Ω
oscilloscope input -- use the TekProbe
Interface Cable or use a 50
Ω
cable. (Add
50
Ω
termination here if oscilloscope has
only high-impedance input.)
Figure 5- 6: Overload test setup
1.
Connect the circuit as shown in Figure 5--6. Refer to Table 5--10 for the
correct current loop to use for the probe you are testing.
2. Set the RANGE on the amplifier to the highest setting for the probe that is
connected to the amplifier.
3. Adjust the current source output to the value listed in Table 5--10 on
page 5--15 for the probe you are testing. For example, if you are testing a
TCP305, adjust the output to 10 amps.
4. Check that the OVERLOAD LED is off.