Specifications

182011822 Operator’s Manual
ww. Calculate the error by dividing the measured
output voltage recorded in step 3-00 by the
expected output voltage recorded in step 3.
Subtract 1.0 from this ratio and multiply by
100% to get the error in percent.
Error =
Measured Output Voltage
Expected Output Voltage
1) x 100%
°
xx. Record the calculated error to two decimal
places (±0.xx%) as ’X1000 Gain Error’ in the
Test Record.
yy. CHECK -- That the calculated error is less
than ± 1%.
Check X1 and XI0 Bandwidth and Calculate
Rise Time.
a. Connect the AMPLIFIER OUTPUT to
channel 1 of the oscilloscope.
b. Set the channel input coupling to 50 fL
NOTE
If the oscilloscope does not have an internal 50 [2 input
termination, inset the standard inline 50 [2 termination
between the cable and the oscilloscope input.
Use the standard wide bandwidth 50 [2 termination.
The precision termination is not accurate at frequencies
higher than 100 kHz.
c. Set the 1820/1822 GAIN to XI and the
ATTENUATOR to +10.
d.
Connect a BNC cable to the output of the
leveled sine wave generator.
NOTE
Many leveled sine wave generators, including the
SG503, are calibrated only when a special BNC cable is
used on its output. Be sure to use a cable which is
specified for the generator.
Insert a standard 50 ~ termination on the free
cable end and connect the termination to the
+INPUT of the 1820/1822.
4-6
f. Set the sine wave generator output frequency
to 50 kHz, and the amplitude to
approximately 3 Vp-p.
g. Set the oscilloscope V/div to 50 mV/div and
the time/div to 20 p.sec/div. Adjust the trigger
level for a stable display.
h. Adjust the sine wave generator output for an
amplitude of exactly 6 divisions (300 mV)
the oscilloscope.
i. Set the sine wave generator output frequency
to 500 kHz. Be careful not to alter the output
amplitude.
NOTE
The displayed waveform will be compressed in time to
form a solid rectangle. It is not necessary to alter the
time/div setting as long as the peak amplitude can be
measured.
j.
Slowly increase the output frequency of the
sine wave generator until the displayed
amplitude decreases to exactly 4.2 divisions.
This is a 3 dB reduction in amplitude.
, k.
Record the frequency where the X1 Gain -3
dB amplitude is obtained in the Test Record
as ’Measured-3 dB Frequency at X I Gain’.
1. CHECK-- That the frequency is > 10 MHz.
m. Divide the 0.35 by the -3 dB frequency
recorded in step 4-k. The result is the
’Calculated Rise Time at X 1 Gain’. Record
the result in the Test Record.
n. Set the sine wave generator output frequency
to 50 kHz. and the amplitude to
approximately 300 mVp-p
o. Set the 1820/1822 GAIN to XI0.
p. Set the oscilloscope sensitivity to 5 mV/div.
q. Adjust the sine wave generator output for an
amplitude of exactly 6 divisions (300 mV)
the oscilloscope.
r. Set the sine wave generator output frequency
to 500 kHz. Be careful not to alter the output
amplitude.
s. Slowly increase the output frequency of the
sine wave generator until the displayed
amplitude decreases to exactly 4.2 divisions.
This is a 3 dB reduction in amplitude.