TCPA300 and TCPA400 Amplifier Adjustments
TCPA300 Ampli
fier
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 1 A/V rang
e, which does not have an adjustment. To make adjustments to
the amplifier, do the following:
1. Set up the ci
rcuit shown.
Figure 13: Amplifier adjustments
2. Set the current source to the values shown and adjust the corresponding
adjus
tment pot to the target values shown. (See Table 25.) The adjustment
locations on the amplifier board are shown. (See Figure 14 on page 48.)
Table 25: TCPA300 gain adjustments
Ran
ge, A/V
Current source
val
ue, ADC
Adj
ustment
Minimum
output,
VDC
Expected output,
VDC Max
imum output, V DC
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.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual 47
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