DA 1855A - Operator's Manual - Teledyne LeCroy
DA 1855A - Operator's Manual - Teledyne LeCroy
DA 1855A - Operator's Manual - Teledyne LeCroy
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Operator’s <strong>Manual</strong><br />
• By using the <strong>DA</strong><strong>1855A</strong> in the comparison voltage mode and the oscilloscope in a high<br />
sensitivity setting, highly accurate voltage measurements can be made.<br />
• The Precision Voltage Generator can be used as a position control which allows the<br />
<strong>DA</strong><strong>1855A</strong> to operate in its linear region.<br />
Differential Offset Operation (VDIFF)<br />
Leave the <strong>DA</strong><strong>1855A</strong> set up as in the previous exercise or set it up as follows:<br />
+INPUT<br />
–INPUT<br />
BW LIMIT<br />
GAIN<br />
DC<br />
V COMP<br />
FULL<br />
X10<br />
ATTENUATOR ÷ ÷1<br />
INPUT RESISTANCE<br />
1 M Ω<br />
PVG +0.0500<br />
COMPARISON or<br />
DIFFERENTIAL<br />
COMPARISON<br />
EFFECTIVE GAIN<br />
Set the Function generator’s output to 50 kHz and 100 mVp-p sine wave and the output connected<br />
to the <strong>DA</strong><strong>1855A</strong>’s +INPUT.<br />
Set the oscilloscope to 50 mV/div (equivalent to 5 mV/div with <strong>DA</strong><strong>1855A</strong> set at X10 GAIN) and<br />
time/div adjusted for 2 to 3 cycles.<br />
Externally trigger the oscilloscope by connecting a cable from the function generator’s output (same<br />
signal as is applied to the <strong>DA</strong><strong>1855A</strong>'s +INPUT) or from the Trigger Signal out on the Function<br />
generator to the External trigger input of the oscilloscope.<br />
Under these conditions, the negative peak of the display on the oscilloscope should be very near<br />
center screen. Adjust the value in the Precision Voltage Generator until the negative peak is at<br />
center screen.<br />
Press the VDIFF button. This internally applies the output of the Precision Voltage Generator to a<br />
point within the <strong>DA</strong><strong>1855A</strong>'s amplifier that facilitates a true differential offset. The VCOMP light went<br />
out and the OFF light was lighted. In the line under the Precision Voltage Generator display<br />
(COMPARISON or DIFFERENTIAL OFFSET), the COMPARISON light went out and the DIFFERENTIAL<br />
light was lighted. This indicates that the Precision Voltage Generator will now be applied as a<br />
differential offset rather than as a comparison voltage as in the previous exercise. Both the +INPUT<br />
and the –INPUT inputs are now enabled.<br />
The positive and negative peaks of the waveform displayed on the oscilloscope are 10 divisions<br />
above and below (respectively) the center line of the display. Push the button above the digit that is<br />
922258-00 Rev A 33<br />
X10
Change language