Teledyne LeCroy DA1855A - Manual (Page 68)

DA1855A Differential Amplifier
62 922258-00 Rev A
2. Check X10 Gain Accuracy
NOTE: Because most DMMs do not provide the required accuracy on lower AC voltage
ranges, the check for X10 Gain Accuracy uses a ratio technique with an external ÷10
attenuator. The actual attenuation of the attenuator is determined using higher amplitude
signals.
a. Disconnect the DA1855A amplifier output cable and the precision 50 Ω termination
from the DMM.
b. Disconnect the sine wave generator output cable from the +INPUT and remove the
50 Ω termination from the coaxial cable.
c. Connect one female end of a BNC Tee to the sine wave generator cable.
d. Connect a 50 Ω ÷10 attenuator to the male end of the BNC Tee followed by a
standard 50 Ω termination.
Reconnect the banana plug adapter to the DMM and connect another coaxial cable from
the banana plug adapter to the other female end of the BNC Tee. See
e. Figure 10.
f. Set the sine wave generator output amplitude to read 2.00 Vrms ± 50 mV on the
DMM.
g. Record the reading to 1 mV resolution as the ‘Sine Wave Generator Output Voltage’
in the Test Record.