Tektronix TCPA300 SERIES, Instruction Manual

Page: 124 / 205

TCP303 and TCP404XL Performance Verification
5- 34
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2.
Press the amplifier
PROBE DEGAUSS AUTOBALANCE
button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns green.
3. Clamp the current probe around the 50 turn current loop, as shown in
Figure 5--10 on page 5--33. Maintain proper polarity; the arrow-shaped
indicator on the probe points away from the (+) terminal of the current
source.
4. For each of the amplifier range settings in Table 5--19 on page 5--35, perform
the following steps:
a. If you are testing a TCP303, set the amplifier range to the first setting in
Table 5--19 for that probe. For example, set the range to 5A/V.
b. Set the current source output to the first positive (+) setting in
Table 5--19 for the probe you are testing. For example, if you are testing
a TCP303, set the output to +0.100 A. (Each output level is tested at
both polarities; later in the procedure, you will set the output to
--0.100A.)
c.
Enable the output of the current source.
d. Record the exact measurement of the digital multimeter as M1.
e.
Set the current source output to the first negative (--) setting in
Table 5--19 for the probe you are testing. For example, if you are testing
a TCP303, set the output to --0.100 A.
f. Record the exact measurement of the digital multimeter as M2.
g. Verify that the measured output (M1--M2) is within the warranted
specification listed in Table 4--1 on page 4--1, by computing %Error as
follows:
% Error
=
M
1
−
M
2
−
2( V
E
)
2( V
E
)
×
100
For example, you may measure values of 0.990V for M1 and --0.998V
for M2. With an expected V
E
of 1.0V, you compute the %Error as
follows:
% Error
=
0.990 V
−
--0.998 V
−
2(1 V )
2(1 V )
×
100
=
1.988 V
−
2 V
2 V
×
100
=
--0.6%
Procedure