Tektronix 213 DMM Instruction Manual page 116

213 Service
SPECIAL CONDITIONS
Special conditions are established after all controls are set as specified in 213 CONTROL SETTINGS
on the VOLTAGE AND WAVEFORM CONDITIONS pullout page.
· (1) DMM mode of operation.
(3) Set Volts-mA/DIV to 100 kS1; S1 button in; connect a 100 kS1, 0.1% resistor for measurement.
(6) Input is a 4 V p-p sine wave at 1 kHz; INPUT COUPLING is AC.
(7) RMS button in.
(8) Overrange indication is displayed.
(9) Test oscilloscope is externally triggered on pin 1 of U260.
(10) For voltages at test points
0 ,
@ , @ ,
and
0 ,
see Table 9-2.
4-DECADE COUNTER AND CHARACTER GENERATOR CHECK
Set up the calibration procedure for the Character Generator Check. Establish the logic HI and LO for
pins 10, 11, 12, and 13 of U260 (A logic HI should exist at each pin when the INPUT COUPLING is set to
GND, and O's should be displayed. Establish the logic LO by setting the de signal source for the display
character that has a logic LO at the pin being measured. The character being displayed should appear in
only one position and the other positions should display O's.) Select a VOL TS-mA/DIV switch setting
that will display the character being checked in only one position with O's in the other positions. Change
the signal source to display each of the characters and check the logic levels at pins 10, 11, 12, and 13.
Voltages shown are typical.
TABLE 9-2
4-Decade Counter and Character Generator Check
Pin 9 Pin 10 Pin 11
Pin 12
Display
(HI +4.3 V/ (HI +4.3 V/ (HI +3.2 V/
(HI +3.2 V/
Character
LO +3.5 V)
LO +3.5 V) LO +2.4 V) LO +2.4 V)
0
HI HI HI HI
1
LO HI HI HI
2
HI
LO HI HI
3
LO LO HI HI
4
HI HI LO
HI
5
LO HI LO HI
6 HI LO
LO HI
7
LO LO LO HI
8 HI
HI HI
LO
9 LO HI HI
LO
.
~
2
3
4
5
@
MORE~
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6 1
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