Ap034 Use With The Adpps Power Supply - LeCroy AP034 Instruction Manual

AP034 USE WITH THE ADPPS POWER SUPPLY

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When the AP034 Active Differential Probe is first connected to
the oscilloscope, the
"WARNING: Probe offset buttons are locked." This alerts you
that offset control must be made through the oscilloscope, rather
than through the buttons located on the probe. It does not
indicate a failure in the probe or oscilloscope.
Correct display of scale factor with the ÷20
attenuator installed and correct operation of
probe offset require that software version 8.1 or
higher be loaded. Refer to the manual section
"Oscilloscope
additional information.
The optional ADPPS Power Supply allows the AP034 Active
Differential Probe to be used with instruments that are not
equipped with the ProBus interface. When used with the ADPPS,
the AP034 must be terminated into 50 Ÿ ,I WKH WHVW LQVWUXPHQW
input impedance is not 50 Ÿ LQVHUW D  Ÿ LQOLQH WHUPLQDWRU
between the ADPPS and the instrument input. If a coaxial
extension cable is used, the terminator should be located at the
instrument end of the cable. Note that the additional parasitic
losses of extension cables may reduce the usable bandwidth of
the system below the AP034 specification.
To prevent signal distortion, it is necessary to keep the AP034
output less than 400 mV at all times.
With the ProBus interface (see note on following page), the
oscilloscope O control actually controls the AP034 offset.
FFSET
Without the ProBus, it is acceptable to use the oscilloscope to
position the waveform at high sensitivities, but it is a practice that
can lead to erroneous measurements when the probe output
exceeds ±400 mV. Therefore, when the ADPPS is used, it is
preferable to use the AP034 offset function to perform all
waveform positioning.
The AP034 offset allows you to measure signals up to 2.0 V
(1.6 V of offset plus 400 mV of output signal). With accessory
plug-on attenuators, the effective offset is increased, and input
signals of 20 V (÷10) or 40 V (÷20) may be viewed. The peak
ISSUED: January 2000
$3 $FWLYH 3UREH
following message
Note:
Software Compatibility"
will appear:
for
AP034-OM-E Rev D