Teledyne LeCroy DA1855A - Manual (Page 64)

DA1855A Differential Amplifier
58 922258-00 Rev A
Preliminary Procedure
1. Connect the DA1855A Differential Amplifier to an AC power source within the range listed in
the Nominal Characteristics in the Specification section.
2. Allow at least 20 minutes warm-up time for the DA1855A and test equipment before
performing the Verification Procedure.
3. Turn on the other test equipment and allow these to warm up for the time recommended
by the manufacturer.
4. While the instruments are reaching operating temperature, make a photocopy of the
Performance Verification test record (located at the end of this section), and fill in the
necessary data.
The warranted characteristics of the DA1855A Differential Amplifiers are valid at any temperature
within the Environmental Characteristics listed in Specifications. However, some of the other test
equipment used to verify the performance may have environmental limitations required to meet
the accuracy requirements needed for the procedure. Be sure that the ambient conditions meet the
requirements of all the test instruments used in the procedure.
NOTE: When the oscilloscope input is connected to the DA1855A AMPLIFIER OUTPUT, the
oscilloscope input impedance must be set to DC 50

unless otherwise stated. Use a 50

inline
termination when using an oscilloscope without an internal 50

termination. Position the
oscilloscope display to center screen. Unless otherwise noted, the oscilloscope position and offset
must remain at zero for the duration of the verification procedure.
This procedure is written assuming local control of the DA1855A Differential Amplifier. When using a
Teledyne LeCroy oscilloscope, do not use the ProBus cable.
Prior to performing the verification, set the DA1855A as follows:
GAIN X1
ATTENUATOR ÷1
INPUT RESISTANCE 1M
+INPUT OFF
–INPUT OFF
V
COMP
OFF
V
DIFF
OFF
BANDWIDTH LIMIT FULL
PVG ZERO
OFFSET ZERO