Ap033 active probe – Atec LeCroy-AP033 User Manual
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ISSUED: October 2001
AP033-OM-E Rev F
AP033 Active Probe
AP033 Active Probe
AP033 Active Probe
AP033 Active Probe
WARRANTED ELECTRICAL CHARACTERISTICS
Warranted characteristics are parameters with guaranteed
performance. Unless otherwise noted, tests are provided in the
Performance
Verification
Procedure
for
all
warranted
specifications.
LF Gain Accuracy:
2% into 50.0
Ω
load
3
,
measured at 1 kHz with 0 volt
offset
Common Mode Rejection Ratio
4
: (Probe head grounded, DC
Coupled,
÷
1 Attenuation,
without external attenuator)
70 Hz
≥
3160:1
(70 dB)
1 MHz
≥
1000:1
(60 dB)
250 MHz
≥
5:1
(14 dB)
Notes:
3
Output impedance is 50
Ω,
intended to drive 50
Ω
. Add
uncertainty of termination impedance to accuracy.
4
LeCroy measures CMRR with a fixture that connects
the probe tip ground to the signal source ground. This
method is necessary to obtain a reproducible CMRR
measurement.
Often, users leave the probe tip ungrounded when
measuring high frequency signals. Not grounding the
probe tip can actually improve CMRR by allowing
some of the common mode signal to be impressed
across the entire length of the probe cable instead of
from probe tip to probe ground. The CMRR
improvement obtained without grounding the probe tip
depends on proximity to probe cable ground, and is
therefore nonreproducible.
LeCroy has chosen to use a reproducible method of
measurement, rather than obtain a more optimistic
measurement.