Verification and Performance Tests 5
Performance Verification Tests
U3606A User’s and Service Guide 171
4 Connect another 50 Ω feed- thru termination to the differential amplifier
output and an RMS voltmeter to the 50 Ω feed- thru termination (see
Figure 5- 11 on page 151).
5 Turn on the instrument. Press Current to select the constant current
mode. Ensure that the S2 (8 V/3 A) range is selected (the S2
annunciator is illuminated). Press Shift > Range again if it is not.
6 Set the output current to the full rated value (3 A for S2 range) and
voltage to full scale. Enable the output.
7 Configure the differential amplifier as follows:
i Set to the AC mode (positive and negative) to remove the DC
component.
ii Set to the differential mode.
iii Set the gain to ×10.
iv Set the attenuation to 1.
v Set the low pass filter to 1 MHz bandwidth limit to filter out input
signals containing higher frequencies.
vi Set to the zero precision current generator.
vii Set the input impedance to 1 MΩ .
8 Configure the RMS voltmeter as follows:
i Set the high pass filter to 10 Hz.
ii Enable AC coupling.
9 Obtain the maximum rms current measurement as indicated in the RMS
voltmeter. Divide the value by 10 and then multiply by 5 to get the
constant current rms noise measurement. The result should not exceed
0.001 A
rms
.
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