Tektronix DM505 Instruction Manual page 45

Callbration Procedure (Adjudments)-DM 505
7. Adjust the LO fl
a. Press the kR button, the LO Cl button and the 2 kfl
range button.
c. Connect the ac voltage calibrator t o the VOLTS/il
and LOW connectors.
d. EXAMINE-that the DM 505 display reads 1.900
*0.012.
b. EXAMIiq4E-that the DM 505 display reads 1.900
*
0.01 1 .
e. ADJUST-R1322, the 2 VAC
ADJ,
for a display
reading of
1 .W0
3.0.001.
c. ADJUST-Rl413, the LO R ADJ, for a display
reading of 1.900 f 0.001.
d, Disconnect the resistance standard.
8.
Adjust the Ac Zero
a. Press the VOLTS AC button, and the 200 mV range
button.
f, INTERACTION-this adjustment affects the 200
mVac and 10 kHz ac adjustments.
g. Set the ac voltage calibrator output t o
0 V and
disconnect it from the DM 505.
10. Adjust
t h e
200 mVac Range
a. Press the VOLTS AC button and the 200 mV range
b. Short the VOLTS/R and LOW input connectors button.
together using the dual banana plug shorting bar.
b. Set the ac voltage calibrator t o 0,190 Vac at
100
Hz.
e. EXAMINE-that
the DM 505 display reads 00.0
*
0.2.
c. Connect the ac voltage calibrator t o the VOLTS/R
and
LOW input connectors.
d. ADJUST-R1321, the AC ZERO ADJ, for a display
reading of 00.0. Wait about three
seconds
and verify the
reading, d. EXAMINE-that
the DM 505 display reads
190-0
f
1 . 2 .
e.
Press the 2 V range button.
e.
ADJUST-R1323, the .2 VAC ADJ, for a display
f. EXAMINE-that the DM
505
display reads .000
reading of
lKLO
*
20.002.
f. I NTERACTION-this adjustment affects the 10 kHz
g. ADJUST-R1321 for a display reading of .000.
ac adjustment.
h. INTERACTION-this adjustment affects the g.
Set the ac voltage calibrator output to
0 V and
200
mYac and 2
Vac range adjustments.
disconnect it from the DM
505.
i. Disconnect the short between the VOLTS/n and
1 1 . Adjust the 10 kHz Ac
LOW
i
n put connectors.
Remove the right side cover from the DM 505. Perform
this adjustment with both side shields on the instrument
9. Adjust the 2 V Ac Range
using a plastic adjustment tool with a small metal blade.
a. Press the VOLTS AC button and the 2 V range
button. a. Connect the output ground terminal of the ac
voltage calibrator to the DM 505 LOW input connector.
Connect the output H I termlnal of the calibrator t o the
b.
Set the ec voltage calibrator to 1.900 V at 100 Hz.
DM 505 VOLTS/n input connector.