-5-
Figure 6 7106R Functions
a
b
a
b
c
d
e
f
g
TYPICAL SEGMENT OUTPUT
0.5mA
2mA
V+
Segment
Output
Internal Digital Ground
LCD PHASE DRIVER
LATCH
7 Segment
Decode
7 Segment
Decode
7 Segment
Decode
Thousand
Hundreds
Tens
Units
*
CLOCK
To Switch Drivers
From Comparator Output
-4
LOGIC CONTROL
Internal Digital Ground
200
BACKPLANE
20
V+
TEST
V
500
Ω
4
15
6.2V
1V
* Three inverters.
One inverter shown for clarity.
1
2
3
OSC 1
OSC 2
OSC 3
DIGITAL SECTION
ANALOG SECTION of 7106R
CREF
RINT
CAZ
CINT
INT
CREF+
REF HI
REF LO CREF BUFFER
V+
14
7
5
6
8
13
12
40
AUTO
ZERO
+
A-Z &
Z1
A-Z &
Z1
A-Z
DE (+)
DE (+)
DE (-)
DE (-)
IN HI
COMMON
IN LO
9
10
INT
10
µ
A
V+
11
INT
+
+
+
2.8V
A-Z & DE(+)
& Z1
15
V
Z1
6.2V
A-Z
COMPARATOR
ZERO
CROSSING
DETECTOR
POLARITY
FLIP/FLOP
TO
DIGITAL
SECTION
INTEGRATOR
7106R Pin Connections
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
OSC 1
OSC 2
OSC 3
TEST
REF HI
REF LO
+ REF CAP
– REF CAP
COMMON
INPUT HI
INPUT LO
AUTO-ZERO
BUFFER
INTEGRATOR
(–) SUPPLY
G (TENS)
C (100’s)
A (100’s)
G (100’s)
BACKPLANE
(7106R)
POLARITY
(MINUS)
AB (1000)
E (100’s)
F (100’s)
B (100’s)
D (100’s)
E (TENS)
F (TENS)
A (TENS)
B (TENS)
C (TENS)
D (TENS)
E (UNITS)
G (UNITS)
F (UNITS)
A (UNITS)
B (UNITS)
C (UNITS)
D (UNITS)
(+) SUPPLY
Pin Configuration
7106R
a
b
c
d
e
f
g
a
b
c
d
e
f
g
-30-
(A) DC/AC Voltage Measurement
1. Set the selector switch to “DC” or “AC”.
2. Connect the red test lead to “V/
Ω
” input jack and
the black one to the “COM” jack.
3. Set the range selector knob to the desired volt
position. If the magnitude of the voltage is not
known, set the range selector knob to the
highest range and reduce until a satisfactory
reading is obtained.
4. Connect the test leads to the device or circuit
being measured.
5. Turn on the power to the device or circuit being
measured. The voltage value will appear on the
digital display along with the voltage polarity.
6. Turn off the power to the device or circuit being
tested and discharge all of the capacitors prior to
disconnecting the test leads.
(B) DC/AC Current Measurement
1. Set the selector switch to “DC” or “AC”.
2. Connect the red test lead to the “A” input jack for
current measurement up to 200mA, and the
black one to “COM”.
3. Set the range selector knob to the desired “Amp”
current position.
If the magnitude of current is not known, set the
rotary/function switch to the highest range and
reduce until a satisfactory reading is obtained.
4. Open the circuit to be measured, and connect
the test leads in series with the load in which
current is to be measured.
5. Read the current value on the digital display.
6. Turn off all power to the circuit being tested and
discharge all of the capacitor prior to
disconnecting the test lead.
7. To measure in the 20A range, use the “20A” jack
as the input jack. Be sure to measure within 10
seconds to avoid high-current hazard.
(C) Resistance Measurement
1. Set the selector switch to the “Ohm” position.
2. Connect red test lead to the “V/
Ω
” input jack and
the black one to “COM”.
3. Set the range selector knob to desired “Ohm”
position.
4. If the resistance being measured is connected to
a circuit, turn off the power to the circuit being
tested and discharge all capacitors.
5. Connect the test leads to the circuit being
measured. When measuring high resistance, be
sure not to contact adjacent point even if
insulated, because some insulators have a
relatively low insulation resistance, causing the
measured resistance to be lower than the actual
resistance.
6. Read resistance value on digital display.
3-3 Method of Measurement
