Teledyne LeCroy DA1855A - Manual (Page 65)

Operator’s Manual
922258-00 Rev A 59
Functional Check
The functional check will verify the basic operation of the Differential Amplifier functions.
It is recommended that the Functional Check be performed prior to the Performance Verification
Procedure to assure that all other non-warranted functions perform as specified.
To perform the functional check:

Select channel 1 of the oscilloscope and set the input coupling to DC 50 Ω , vertical scale to
100 mV/div, timebase to 10 μsec/div and adjust the trace to screen center.

Connect the output of the function generator with a BNC cable to channel 1 of the
oscilloscope and set the output to square wave and the amplitude to 300 mV (3 div on
screen).

Remove the function generator output cable from the oscilloscope.
1. ProBus operation
a. Connect the ProBus and the BNC cables to the output of the DA1855A and to channel 1
of the oscilloscope.
b. Verify that channel 1 is selected and that the DA1855 is being recognized by showing
DA1855A on the screen’s menu.
2. Coupling
a. Connect the 300 mV output voltage of the square wave generator to the +INPUT of the
DA1855A.
b. Verify that the trace is a single line centered on the screen.
c. Press the DC button on the +INPUT of the DA1855A. and verify that the trace has moved
either up or down depending on the polarity of the signal and that DC is highlighted on
the screen’s menu.
d. Press the AC button on the +INPUT and verify that the input signal is centered on screen
and AC is highlighted on the screen’s menu.
e. Disconnect the function generator’s output signal from the +INPUT and connect it to the
–INPUT.
f. Verify the performance of steps 2-b through 2-d for the – input.