Vertical System; Check/Adjust Dc Balance; Check Vertical Deflection Accuracy; Check Vol Ts-Ma/Div Var Range - Tektronix 213 DMM Instruction Manual

Performance Check-213 Service
8. VERTICAL SYSTEM
Equipment Required
1. Amplitude Calibrator
2. Sine-Wave Generator
3. Probe Adapter
4. Screwdriver
5. Low-Capacitance Screwdriver
6. Attenuator, 5X
7. Termination, Feedthrough
8. Adapter, Banana Plug
Control Settings
POWER
DMM
RMS
VOLTS
VOL TS-mA/D IV
INPUT COUPLING
INTENSITY
ON
Button in
Button out
Button in
0.1 (blue scale)
GND
Minimum for a visible
display
1. CHECK/ADJUST DC BALANCE
a. Alternately select the 0.1 V and 1 V range (blue scale)
on the VOL TS-mA/D IV switch.
b. CHECK-Display has the same count (approximately
zero) and polarity sign in both switch positions.
c. ADJUST -DC BAL (side-panel screwdriver adjust-
ment) for the same count and polarity indication.
2. CHECK VERTICAL DEFLECTION ACCURACY
a. Set: DMM
INPUT COUPLING
VOLTS-mA/DIV
SEC/DIV
LEVEL-SLOPE
REV. A, JUNE, 1976
Button out
DC
20 m (black scale)
1 m
Midrange of either slope
(do not set at midrange
of the control)
b. Connect the probe to the Amplitude Calibrator with a
probe adapter. Set the Calibrator for an output of 1 kHz
and adjust for a stable display.
c. Set VOL TS-mA/DIV and Calibrator as shown in Ta-
ble 5-1.
d. CHECK-Vertical deflection accuracy is within limits
shown in Table 5-1.
TABLE 5-1
Vertical Deflection Accuracy
VOLTS-mA/DIV Amplitude
Deflection Limits
Setting Calibrator
(Divisions) (Divisions)
(black scale) Setting
10m 50mV 5 4.85 to 5.15
.5 2V 4 3.88 to 4.12
2 10 V 5
4.85 to 5.15
20 100 V 5
4.85to5.15
3. CHECK VOL TS-mA/DIV VAR RANGE
a. Set VOL TS-mA/DIV to 20 m (black scale).
b. Set the Amplitude Calibrator for an output of 0.1 V
at 1 kHz.
c. Rotate the VOLTS-mA/DIV VAR control toward
fully counterclockwise position.
d. CHECK-VOL TS-mA/DIV VAR range for at least a
2.5: 1 ratio (vertical deflection is reduced to two divisions
or less).
e. Reset VOL TS-mA/D IV VAR to its calibrated detent.
4. CHECK/ADJUST ATTENUATOR COMPENSATION
a. Set: VOLTS-mA/DIV
SEC/DIV
INPUT COUPLING
.2 (black scale)
.2 m
DC
b. Set the Amplitude Calibrator for 1 V at 1 kHz and
adjust the 213 for a stable display.
5-3