TCPA300 and TCPA400 Amplifier Adjustments
6-4
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
TCPA300 Amplifier
The TCPA300 has four internal adjustments that affect the gain of the amplifier.
(The TCPA400 has one adjustment.) Each range has an individual control,
except the 1A/V range, which does not have an adjustment. To make adjustments
to the amplifier, do the following:
1. Set up the circuit shown in Figure 6--1.
Current source
DMM
+--
BNC-to-dual
banana adapter
50 Ω Precision
termination
+--
Calibration
adapter
BNC-to-dual
banana adapter
Amplifier
50 Ω Coaxial cable
Figure 6- 1: Amplifier adjustments
2. Set the current source to the values shown in Table 6--3 and adjust the
corresponding adjustment pot to the target values shown in Table 6--3. Use
Figure 6--2 on page 6--5 to locate the adjustments on the amplifier board.
Table 6- 3: TCPA300 gain adjustments
Range, A/V
Current source
value, ADC
Adjustment
Minimum
output, VDC
Expected
output, VDC
Maximum
output, VDC
1 0.100 No adjustment 4.9900 5.0000 5.0100
5 0.100 25 Ω 2.4950 2.5000 2.5050
10 0.100 12.5 Ω 1.2350 1.2375 1.2400
50 0.100 5 Ω 0.4825 0.4835 0.4845
50 COMP
1
0.100 5 Ω COMP 0.4576 0.4585 0.4594
1
Both 10 A/V and 50 A/V LEDs light.
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