Tektronix 213 DMM Instruction Manual page 73

Calibration-213 Service
8. VERTICAL SYSTEM
Equipment Required
1. Amplitude Calibrator 6.
Low Capacitance Screwdriver
2. DC Voltage Standard
7.
Attenuator, 5X
3.
Sine-Wave Generator 8. Termination, Feedthrough
4. Probe Adapter 9. Adapter, Banana Plug
5. Screwdriver
For adjustments and test points (TP), see
ADJUSTMENT LOCATIONS
pullout page in the Diagrams section.
Control Settings
POWER ON
DMM
RMS
VOLTS
VOLTS-mA/DIV
INPUT COUPLING
INTENSITY
Button in
Button out
Button in
0.1 (blue scale)
GND
Minimum for a visible
display
1. CHECK/ADJUST DC BALANCE AND DC ZERO
@
a. Alternately select the 0.1 V and 1 V range (blue scale)
on the VOL TS-mA/DIV switch.
b. CHECK-Display has the same count (approximately
zero) and polarity sign in both switch positions.
c. ADJUST-DC BAL, R145, for the same count and
polarity sign.
d. Remove the DC Cal Jumper wire (see Figure 9-4).
e. Repeat steps a through c.
f. ADJUST - DC Zero, R 185, for a minimum reading.
g. Replace the DC Cal Jumper wire.
2. CHECK/ADJUST 10X GAIN
a. Set: VOL TS-mA/DIV 0.1 (blue scale)
INPUT COUPLING DC
b. Connect the probe to the DC Voltage Standard with
a dual banana-plug to BNC adapter and a probe adapter.
Set the Standard to +0.20000 volts.
c. CHECK-Reading of +.2000 ± .0005 (+.1995 to
+.2005).
d. ADJUST -1 OX Gain, R 152, for reading of +.2000.
e. Disconnect the Standard.
3. CHECK/ADJUST VERTICAL GAIN
a. Set: DMM
VOL TS-mA/DIV
SEC/DIV
LEVEL-SLOPE
Button out
20 m (black scale)
1m
Midrange of either
slope (do not set at
midrange of the
control)
6-7