TCP303 and TCP404XL Adjustments
TCP404XL Procedure
1. Move the o scill
oscope trace to one graticule line from the bottom of the screen.
2. Do not clamp the current probe around any conductor, but make sure the
jaws are locke
d shut.
3. Remove the probe access plugs for 1 ms, 10 ms, and DC Gain.
4. Preset the probe adjustments: The adjustment locations are shown. (See
Figure 17 on page 53.) Do this only a t the beginning of the probe adjustment
process.
a. Set the 1 μs adjustment fully clockwise
b. Set the 10 ms adjustment fully counterclockwise
5. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the PROBE DEGAUSS AU TOBALANCE LED returns
to green
.
6. Lock the jaws of the probe around the built-in current loop on the high
amplit
ude pulse generator. Observe proper polarity; the arrow-shaped
indicator on the probe points away from the (+) terminal of the current source.
7. Repea
t steps a through d to achieve optimum response:
a. Adjust the DC gain adjustment to produce an amplitude of five graticule
divi
sions (5 A) at the 100 ms portion of the pulse.
b. Adjust the 10 ms control for a flat waveform to match the level at the
100
ms point.
c. Adjust the oscilloscope sweep to 1 ms/div.
d. Adjust the 1mscontrol to flatten the front end of the pulse.
NOTE. The 10 μsand1μs adjustments on the TCP404XL interact. Adjusting them
c
an be a repetitive process. You may need to balance between short and long term
response to meet both specifications at once.
8. Verify the DC gain accuracy using this procedur e. (See page 58, DC Gain
Adjustment.) You may need to make some minor adjustments to the DC gain
adjustment to achieve the highest accuracy possible.
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual 57
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