Instrument Repackaging - Tektronix 213 DMM Instruction Manual

6. Check Voltages and Waveforms. Often the defective
component can be located by checking for the correct vol-
tage or waveform in the circuit. Refer to the Diagrams sec-
tion at the rear of the manual for correct voltages and wave-
forms.
7. Check Individual Parts. The following procedures des-
cribe methods of checking individual parts in the 213.
Parts that are soldered in place are best checked by first
disconnecting one end. This isolates the measurement
from the effects of surrounding circuitry.
a. Resistors. Check the resistors with an ohmmeter. See
the Electrical Parts List for the value and tolerance of
the resistors used in this instrument. Resistors normally
do not need to be replaced unless the measured value
varies widely from the specified value.
b. Inductors. Check for open inductors by checking
continuity with an ohmmeter. Shorted or partially
shorted inductors can usually be found by checking the
waveform response when high-frequency signals are pas-
sed through the circuit. Partial shorting often reduces
high-frequency response (roll off).
c. Capacitors. A leaky or shorted capacitor can best be
detected by checking resistance with an ohmmeter on
the highest scale. Do not exceed the voltage rating of
the capacitor. The resistance reading should be high af-
ter initial charge of the capacitor. An open capacitor
can best be detected with a capacitance meter or by
checking if the capacitor passes ac signals.
8. Repair and Readjust the Circuit. If any defective parts
are located, fol low replacement procedures. Be sure to
check the performance of any circuit that has been repair-
ed or had any electrical components replaced.
REV. A, MAR. 1976
Maintenance-213 Service
INSTRUMENT REPACKAGING
If the Tektronix instrument is to be shipped to a Tektronix
Service Center for service or repair, attach a tag showing:
owner (with address) and the name of an individual at your
firm that can be contacted, complete instrument serial
number and a description of the service required.
Save and re-use the package in which your instrument was
shipped. If the original packaging is unfit for use or not
available, repackage the instrument as follows:
1. Obtain a carton of corrugated cardboard having inside
dimensions of no less than six inches more than the
instrument dimensions; this will allow for cushioning.
Refer to the following table for carton test strength
requirements.
2. Surround the instrument with polyethylene sheeting to
protect the finish of the instrument.
3. Cushion the instrument on all sides by tightly packing
dunnage or urethane foam between carton and instru-
ment, allowing three inches on all sides.
4. Seal carton with shipping tape or industrial stapler.
SHIPPING CARTON TEST STRENGTH
Gross Weight (lb)
0-10
10-30
30-120
120-140
140-160
Carton Test Strength (lb)
200
275
375
500
600
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