P6139A Instructions
1
Operating Basics
The P6139A is a compact high impedance passive probe designed for use with
Tektronix TDS 3000 and TDS 500 Series digitizing oscilloscopes. The P6139A
has a 1.3 meter cable and is fully compatible with the Tektronix family of
compact size (3.5 mm) probe accessories. The Replaceable Parts list beginning
on page 7 identifies the standard and optional accessories for the P6139A probe.
WARNING.
To avoid electric shock when using the probe, do not touch the
metallic portions of the probe head while connected to a voltage source.
Probe Compensation
Due to variations in oscilloscope input characteristics, probe low-frequency
compensation may need adjustment after moving the probe from one oscillo-
scope to another. If a 1 kHz calibrated square wave displayed at 1 ms/division
shows significant differences between the leading and trailing edges, perform the
following steps to optimize low-frequency compensation.
1. Connect the probe to the calibration signal on the oscilloscope front panel.
2. Press AUTOSET or otherwise adjust your digitizing oscilloscope to display
a meaningful waveform.
3. Adjust the trimmer in the probe (accessible through the compensation box)
until you see a perfectly flat-top square wave on the display. See Figure 1.
Undercompensated
Overcompensated
Properly compensated
Figure 1: Probe compensation waveforms
Cleaning
To remove accumulated dirt from the probe exterior, use a soft cloth dampened
with a mild detergent and water solution or isopropyl alcohol. Do not use
solvents such as benzene, toluene, xylene, or acetone. Avoid abrasive cleaners.
