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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
UR14 Driver/Receiver Board I-25
Description
Characteristics
Input voltage absolute maximum rating:
-200 V to +200 V. Note: O V Protection to be
provided on the Probe Module
Detector voltage accuracy; ± (50 mV + 1%)
Detector resolution: 10 mV
DUT_GND correction done in the Probe Module
(Aux. 1 input DUT_GND correction is
automatically disabled).
TIMING PERFORMANCE
Absolute accuracy: ±5 ns With respect to
Channel1
Requires field calibration
PROBE CALIBRATION
(FACTORY)
Trim-pot adjustment of the contact detect compare
level.
May also be done in the field if the user has a 50
pF cap. and a 5 M
Ω resistor and can get access to
the trim-pot.
PROBE CALIBRATION
(FIELD)
Utilizes AUX A 2, provided by the D/R board, to
provide a reference signal on the Probe Module’s
calibration connector which will be used for Probe
Compensation Calibration and DC/Timing
Calibration to the Probe tip.
MINIMUM DETECTABLE
PULSE WIDTH
10 ns
BUFFERED PROBE
OUTPUT
Provided on the UR14 as PROBE OUT
Output range: Same as input from the Probe
Module (± 5V)
Output Impedance: Source terminated at 50ohms
in the Probe Module
Output accuracy from Probe tip to terminated
output: ± (50 mV + 1%)
From the Probe tip, thru the Probe Module to the
UR14 and out the PRBOUT connector
Bandwidth from Probe tip to terminated output: 50
MHz
From the Probe tip, thru the Probe Module to the
UR14 and out the PRBOUT connector
+12V
62 mA minimum 82 mA maximum (max: 16.5 Vp-p
@ 70 Mhz)
-12V
49 mA minimum 69 mA maximum
(max: 16.5 Vp-p @ 70 Mhz)