GDM351/352/353
OPERATION MANUAL
82DM-35100MO
INTRODUCTION
The meter is an accurate compact hândheld, battery
light weight type digital multimeter with 31/2 digits
display. The meter has been çarefully designed and can
reliable performance for your laboratory, or workbench
application.
opération and
liquid crystal
provide long
and home
Unpacking your instrument
The shipping container should contain thé following items :
1.
2.
3.
4.
Digital multimeter
Test lead set (one black and one red)
Instruction manual
9V battrry
Multimeter Safety
The meter has been designed according to IEC Publication 348,
safety requirements for electronic measuring apparatus. The manual
contains information and warnings which must be followed to ensure
safe opération and reta.in thé meter in safe condition.
&
See explantion in manual
±
Ground
Dangerous voltage
Battery
•H-
Fuse
ma
=
•»)
Continuity test
r*j
h
DC Direct current
AC Alternating current
SPECIFICATIONS
Display: 0.65" height 3 1/2 digit Liquid Crystal Display (LCD) With
a maximum reading of 1999.
Overrange Indication: "1" or "-1"
Low Battery Indication: Battery sign is displayed when thé battery
voltage drops below specified opération voltage.
Measuring Rate: 2.5 times per second normal.
Température Coefficient: 0.12 x (spec. accuracy)/°C ( <18°C or >28°C ).
Auto Power Off: Approximatly 15 minutes.
Operaton Température: 0°C to 50°C to 70% RH.
Storage Température: -20°C to 60°C to 80% RH. When battery not install.
Battery Type: 9V, NEDA 1604 or 6F22 or 006P
Battery Life : 300 hrs typical with alkaline (model 351).
200 hrs typical with alkaline (model 352, 353).
Dimention(HxWxD) : 187 x 88 x 44 mm
Weight (including battery) : 340g(model 351), 380g(model 352, 353)
Accessories : Test lead, battery and instruction manual.
Accuracy is ±(% reading H- number of digits) at 23 °C ±5°C,
less then 75% RH.
DCV
Range
Resolution
200mV
lOOj/V
2V
ImV
20V
lOmV
200V
lOOmV
1000V
IV
Input Impédance:
Accuracy
Over voltage Protection
SOOVdc or peak ac
±(0.5%rdg + Idgt)
±(0.5%rdg + 2dgts)
1100V de or peak ac
ACV
Range
Resolution
200mV
lOO^V
2V
ImV
20V
lOmV
200V
lOOmV
750V
IV
Accuracy ( 40Hz-500Hz )over voltage Protection
SOOVdc or peak ac
±(1.2%rdg + 3dgts)
±(1.2%rdg + 4dgts)
Input Impédance: 10MQ, <100pF
1100V de or peak ac
DCA
Range
Resolution
Accuracy
Burden Voltage (max)
«
200^A
lOOnA
2mA
IjjA
20mA
0.01mA
200mA
O.lmA
20 A*
10mA
±(1.2%rdg + Idgt)
300mV
±(2.0%rdg + Sdgts)
700mV
* note : 10A continuous, 20A for 20 seconds maximum.
Overload Protection : 200/jA to 200mA : 300mA, 250V fuse
630mA 500V high energy fuse(352 only).
20A : 20A 600V high energy fuse(352 only)
ACA
Range
Resolution
200^A
lOOnA
2mA
l^A
20mA
0.01mA
200mA
O.lmA
20 A*
10mA
Accuracy
Burden Voltage (max)
±(1.5%rdg + 4dgts)
300mV
i
±(2.5%rdg + 4dgts)
700mV
* note : 10A continuons, 20A for 20 seconds maximum.
Overload Protection : 200pA to 200mA : 300mA,250V fuse
630mA 500V high energy fuse(352 only).
20A : 20A 600V high energy fuse(352 only)
Résistance
Range Resolution Accuracy
351
200Q
2KQ
20KQ
200KQ
2Mn
20MS2
o.in
in
ion
loon
iKn
lOKn
352, 353
±(1.0%rdg + 4dgts) ±(1.0%rdg + 4dgts)
±(1.0%rdg + Idgt)
±(0.7%rdg + Idgt)
±(2.0%rdg + 4dgts) ±(2.0%rdg + 4dgts)
Overload protection : 500V de or peak ac.
8
Max. open circuit
Voltage
3.45V
0.6V
Capacitance (model 352, 353 only)
Range
Resolution
2nF
IpF
20nF
lOpF
200nF
lOOpF
2juF
InF
20^F
lOnF
Accuracy
Test frequency
±(2.0%rdg + lOdgts) «400Hz
Overload protection : Capacitor must be discharged before test,
Frequency (model 352, 3,53 only)
Range
Resolution
2KHz
iHz
20KHz
lOHz
200KHZ
lOOHz
2MHz
iKHz
Accuracy
Input Sensitivity
IV rms
±(1.0% + 4dgts)
2V rms
Frequency range : lOHz to 2MHz
Overload protection : 500V de or peak ac
10
Other Functions
function
Resolution Accuracy
Max. open Voltage
Diode Test
ImV
±(1.0% + 2dgts)
Continuité
O.lfi
< 40Q,
hFE Test
1 - 1000, ib » IQjjA, Vce » 3.2V(model 352,353 only)
Température
Test
1°C
0°C - 500°C ±(1.2% + 2dgts)
-50°C - 0°C, 500°C - 1300°C ±(2% + 2dgts)
(K type)
(353 only)
1°F
-32°F - 932°F ±(1.2% + 2dgts )
-58°F
32°F, 932°F - 1999°F ±(2% + 2dgts)
Overload protection
3.45V
< lOOmS
500V de or peak ac
11
Front Panel Features - Refer to figure 1.
1. 20A Input Terminal - Positive input terminal for up to 20A current
measurements.
2. mA JJA Input Terminal - Positive input terminal for up to 200mA
current measurements.
3. COM Input Terminal - Return terminal for ail measurements.
4. VP. Input Terminal - Positive input terminal for volt s, ohms, diode test
5. Rotary Switch - Sélects thé function and range desired.
6. Display - The 0.65" height 3 1/2 LCD display with dicimal point,
automatic polarity, overrange indicators.
The following item for model 352, 353 only
7. Capacitor Fixture - For up to 20^F capacitance measurements.
8. hFE Fixture - For NPN or PNP transistor hFE measurements.
9. AC/DC Select Switch - For sélect AC or DC measurements.
10. Température input jack - For température probe input jack.(353 only)
12
Front Panel Illustration
Figure 1
13
OPERATION
Before make any measurements always examine thé instrument and
accessories. There are some common applications for your meter, and
alert you to some considérations to keep in mind when taking measurement.
Voltage Measurements (AC or DC)
Warning: - To avoid electric shock, do not exceed thé maximum input
limit lOOOVdc or 750Vac.
1. Place thé rotary switch at thé required position.
2. Insert thé black test lead to "COM" terminal and red test lead to
"V£î" input terminal.
3. Connect thé black test lead then red test lead to measuring points
and read thé display value.
14
Current Measurements
Warning: - To avoid damage, do not attempt any in-circuit current measurement where thé potential is greater then 600V(250V at 351).
1. Place thé rotary switch at thé required position.
2. Insert thé black test lead to "COM" terminal and red test lead to
"mA juA" input terminal. For measuring current between 200mA to 20A,
connect thé red test lead to "20A" input terminal.
3. Connect thé test lead to measuring points and read thé display value.
Résistance measurements
1. Place thé rotary switch at thé required position.
2. Insert thé black test lead to "COM" terminal and red test lead to
"VQ" input terminal.
3. Connect thé test lead to measuring points and read thé display value.
15
Diode Test
1. Place thé rotary switch at thé " ->{- " position.
2. Insert thé black test lead to "COM" terminal and red test lead to
"VÎ2" input terminal.
3. Connect thé test lead to a diode or transistor. Normally forward
forward junction voltage for slcicon diode or transistor should be
about 0.6V. Voltage greater than 3V or open test leads produce an
overload(l) reading.
Continuity Check by Buzzer
1. Place thé rotary switch at thé " •))) " position.
2. Insert thé black test lead to "COM" terminal and red test lead to
"Vfi" input terminal.
3. Connect thé test leads to thé circuit under test.
4. Buzzer sounds continously when thé under test is below approximately 40Q.
16
Battery Measurements (model 351 only)
1. Place thé rotary switch at thé required position.
2. Insert thé black test lead to "COM" terminal and red test lead to
"mA pA" input terminal.
3. Connect thé black test leads to thé battery " - " position and red
test lead to thé " + " position.
4. Therô are an approximentaly 100mA at 1.5V or 6mA at 9V battery dummy
load to get thé best test condition.
17
The following items are for 352, 353 only
Capacitance Measurements
Caution: - Discharge thé capacitor before making measurements, never
apply voltage to thé capacitance test fixture.
1. Place thé rotary switch at thé required position.
2. Discharge thé capacitor before making measurements.
3. Insert thé under test capacitors two leads into test fixture and
read thé display value.
Frequency measurements
Warning: - To avoid electric shock, do not exceed thé maximum input
limit SOOVdc or 360Vac.
1. Place thé rotary switch at thé required position.
18
2. Insert thé black test lead to "COM" terminal and red test lead to
"VQ" input terminal.
3. Connect thé black test lead then red test lead to measuring points
and read thé display value.
Transistor hFE measurements
1. Place thé rotary switch at thé required position.
2. Insert thé under test transistor leads into test fixture and read
thé display value.
Température measurements (model 353 only)
1. Place thé rotary switch at thé required position.
2. Insert thé température test lead (K type) into thé température jack.
3. Using température probe to make température measurement.
19
MAINTENANCE
Thèse instructions are for use by qualified personnel only. To avoid
electrical shock, do not perform any servicing other than that contained
in thé operating instruction, unless you are qualified to do so.
Caution: - To avoid damage, remote thé test leads and any input signal
before replacing battery or fuses.
Battery Replacement
This DMM hâve a self-contained(option) power supply consisting of
one 9V battery (NEDA 1604, 6F22 or 006P). Réfère to figure 2A and use
thé following procédure to replace thé battery.
1.
2.
3.
4.
Disconnect thé test leads and turned off thé power.
Position thé meter face down and lift thé battery cover.
Take off thé battery.
Install thé new battery and install thé battery cover.
20
Fuses Replacement
Refer to figure 2B and using thé following procédure to replace thé
fuses.
1.
2.
3.
4.
5.
Disconnect thé test leads and turned off thé power.
Position thé meter face down and lift thé battery cover.
Take off thé fuse.
Install a same rating and same type new fuse into fuse bracket
Install thé battery cover.
The following procédure for model 352, 353 only
1.
2.
3.
4.
Disconnect thé test leads and turned off thé power.
Position thé meter face down, and lift thé battery cover
Remove thé four screws from thé case bottom.
Lift thé end of thé case bottom until it gently unsnaps from thé case
top at thé end nearest thé LCD.
21
>. 20A Fuse Replacement
>-l. Remove thé defective fuse by gently prying one end of thé fuse loose
and sliding thé fuse out of thé fuse bracket.
>-2. Install a new fuse of thé same size and same rating.
5. 630mA Fuse Replacement
5-1. Remove thé four screws from thé top PCB.
5-2. Carefully Remove thé top PCB.
5-3. Remove thé defective fuse then install a same type and rating new
fuse.
5-4. Carefully turn thé rotary switch to "OFF" position.
5-5. Install thé top PCB to connecter and reinstall thé four screws.
7.
Replace thé case top. Make sure that ail gasketsare properly seated
and thé two snaps on thé case top are engaged.
3. Reinstall thé four screws and reinstall thé battery cover.
22
Battery and Fuse Replacement
How to Use Probe Holder
Figure2A
Figure2B
23