
Connecting the TDR9000
™
Physical Front Panel
4-34
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Current Probes
Current probe inputs can be configured for 20 A or 200 A. Configuration
is performed using the
Analog Channel Connector
or the
Analog
Channels
dialog box of the Virtual Front Panel.
Two types of probes are currently in service for use with the TDR9000:
• An older probe version with an adjustable wheel used for zeroing
• A newer self-zeroing version with a zeroing button on the probe
To maximize performance, either probe should be re-zeroed
immediately before performing any critical measurements. The TDR9000
does not allow a test to run using an unzeroed probe.
Adjustable Wheel Probe
The probe must be re-zeroed whenever a new Test Plan is loaded or a
channel is reactivated using the clamp-on current probe’s built-in offset
adjustment. When zeroing a probe, the PC running the Virtual Front
Panel might not be visible, therefore, the TDR9000 Instrument creates a
modulated beep which aids in properly zeroing the probe. When the
probe is at zero for two seconds, it is considered to be zeroed. The
Instrument emits a steady tone as confirmation.
To zero probe:
1.
To connect and zero the current probe:
a. Taking appropriate safety precautions, plug the Instrument
end of the probe cable into the desired
Analog Channel
Connector
.
The
Analog
channel inputs are polarity sensitive.
Make sure to attach the shield (green/yellow) banana plug to
the chassis ground (green/yellow) banana jack on the Event
module.
b. Set the probe range switch to the low range (10 A or 20 A)
position.
Zeroing the probe with the switch on the high range may yield
inaccurate results. For best results, start the process with the
thumbwheel rotated all the way in one direction.
c. Plug the free end of the
Analog
cable into the current probe.
This requires adapters that are supplied with the Analog
cables.
d. Turn the probe ON and latch the Trigger into the ON position.
Содержание TDR9000
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