Adjust At1505 (Channel A) And At1533 (Channel B), Attenuator Input Capacitance - Tektronix DC 5010 Anleitung

Calibration - DC 5010
Adjustment Procedure
e. ADJUST-the lower adjustment on AT1533 until the
DC 5010 digit on the far right side of the display just
changes from a steady 1 to a 0. The Channel B X5 attenua-
tion is now compensated.
f. Remove all cable connections.
13. Adjust AT1505 (Channel A) and AT1533
(Channel B), Attenuator Input Capacitance.
Function Generator
Output cw (max amplitude)
a. Compensate a X5 test probe to the DC 5010 CHAN-
NEL A input and set for X I attenuation. Refer to Probe
Compensation in the Operating Instructions of this manual.
b. After the probe has been properly compensated, con-
nect the probe tip to the function generator output using a
probe tip-to-bnc connector.
c. Set the DC 5010 CHANNEL A ATTEN to X5 (lighted
button) and press to light the PROBE COMP button.
d. ADJUST-the upper adjustment on AT1505, located
on the Analog board, until the digit located on the far left
side of the DC 501 0 display just changes from a steady 1 to
a 0. The X5 input capacitance is now equal to the X I input
capacitance.
e. Remove the test probe from the CHANNEL A input
and the function generator. Then Compensate the probe
(see step 13a) to the DC 501 0 CHANNEL B XI attenuator.
f. Reconnect the probe tip to the function generator
output.
14. Adjust R I l 4 2 and RIl43, ECL Threshold
Reference Level.
-
NOTE
This procedure should only be performed if U1000,
U1001, UlOl1, U1022, or U1110 have been replaced.
CHANNEL A and
CHANNEL B
TERM 50
Q
ATTEN X I
SLOPE
+
COUPLING DC
a. Pre-set both variable resistors to mid-range (R1142 &
R1143).
NOTE
R 1 142 and R 1 143 are located on the Analog board
(A 12) at location
3-0.
Set the DC 5010 to TIME MAN.
Push MEASUREMENT STARTISTOP in.
ADJUST- R1142 until the instrument counts.
Connect a coaxial cable from the 1 MHz frequency
standard output to the DC 501 0 CHANNEL A input. Adjust
for a 100 mV signal.
f. Go to FREQ A mode and push in AUTO TRIG.
g. Check that the instrument counts correctly. Note that
R1143 may need adjustment for proper counting. Remove
the coaxial cable.
g. Set the DC 501 0 CHANNEL B ATTEN to x 5 (lighted)
and press the PROBE COMP button.
h. Connect a coaxial cable and X I 0 attenuator from the
Signal Generator (SG 504) to the CHANNEL A input.
h. ADJUST-the upper adjustment on AT1 533, located
on the Analog board until the digit on the far right side of the
display just changes from a steady 1 to a 0. The Channel B
x
5 attenuation is now compensated.
--
i. Adjust the Signal Generator for a 350 MHz, 70 mV
peak-to-peak signal.
REV JUL 1983