Tektronix 2236 - Continuity Check; AC RMS Voltage Measurement

Operating Procedures - 2236 Operators
REFERENCE
RESISTANCE
C
+
RED
REVERSE
LEAKAGE
CIRCUIT
+
VTERMINAL
2.5 V
UNKNOWN
RESISTANCE
BLACK
0.5
V
REVERSE VOLTAGE DROP
4205-13
4205-14
Fig .
4-9
.
Resistance
measurement
technique .
Fig . 4-10 .
Reverse voltage
drop to reverse
leakage current
characteristics for typical semiconductor .
Calculate the
reverse -
leakage ,
using the
following
formula
:
1. Set UPPER FUNCTIONS - LOWER FUNCTIONS
switch to OUT and press in both AC RMSV and TEMP
buttons .
П
П
П
on
П
Reverse
-
Leakage
Current
reference
voltage (
+2.5 Volts
)
reference
resistance
resistance
+
displayed
( see Table 4-2 )
on the readout
2.
Connect
the
test leads
across the device
under test .
3.
Listen for
audible tone
and read
the
message on
the
readout .
Table
4-2
Reference Resistance Values
AC
RMS
Resistance
Displayed
On Readout
Reference
Resistance
CAUTION
to
5012
1 k 12
50 Ω to 500 Ω
1
ΚΩ
500Ω to 5
ΚΩ
10 k12
If the
readout displays the
message " OUCH "
( input
voltage equals or exceeds 350 V ) , immediately
disconnect the test leads from the unit - under - test to
prevent
possible instrument
damage
.
5 kΩ to 50 ΚΩ 100 ΚΩ
50 k 2 to 500 k .
1
ΜΩ
Greater than 500 kn
10 ΜΩ
1. Set UPPER FUNCTIONS - LOWER FUNCTIONS
switch to OUT and press in the AC RMSV button .
Continuity
Continuity checks are made by connecting the test leads
across the device under test and measuring the unknown
resistance . If the
resistance
is
greater than or
equal
to 5 1
the readout will display the message “ OPEN ” ; if the resis
tance
is
less than 5
2 an
audible tone is
generated and the
readout will
display the
message
"
Short
" .
2
Connect the – (
negative
) lead to
the
reference point
( usually a ground or test point ) and connect the + ( positive )
lead to the unknown voltage to be measured .
1
3. Read the
rms value of
the input
signal on the
readout
.
4-13