GW Instek GDM-357 Operating Manual

GDM-357
Ⅰ.
OVERVIEW
The brand-new GDM-357 is a 2000-count handheld digital multimeter featuring remarkably
stable and reliable operation. It is designed with large-scale integrated circuits,
a dual integral A/D converter and also offers overload protection for all ranges. The DMM can
measure DC&AC voltage, DC&AC current, resistance, capacitance, diode, transistor,
temperature, frequency, battery and continuity, which makes it a perfect solution for your work.
Ⅱ.
SAFETY INFORMATION
This instrument is designed and manufactured in compliance with: GB4793, IEC61010-1,
IEC1010-2-032, CAT.I 1000V,CATII 600V, Pollution Degree 2 and Double Insulation standards.
Warning
Please operate the instrument as specified in the manual, otherwise the protection offered
by the instrument would be compromised.
test leads
The red and black test leads should be inserted in the proper terminals and ensured with
good contact.
Switching the range
Use only the replacement fuse with the same model or identical electrical specifications.
compromised.
Clean the instrument casing with slightly damp cloth and mild agent. No abrasives and
solvents are allowed.
International Electrical Symbols
Ⅲ. PRODUCT FEATURES
Display Count: 1999.
Auto Power Off.
Temperature Range: Working:0℃~ 40℃(32℉ ~ 104℉);
Storage: -10℃~ 50℃(14℉ ~ 122℉).
Low Battery Indication: on upper left corner of LCD.
Data Hold
(Main unit+holster+tilt stand+battery, excluding test leads)
Ⅳ.
TECHNICAL SPECIFICATIONS
GDM-357
Input
RMS.
GDM-357
(RMS value of sinewave)
DC current
GDM-357
AC current
GDM-357
(RMS value of sinewave)
GDM-357
RMS.
Note: At 200MΩ range, the instruments normally displays 10 digits when the test leads are
shorted. Please subtract 10 digits from the subsequent measurement readings.
Relative Humidity ≤65% for measurements at 200MΩ range.
GDM-357
＞50µF, for reference only.
400Hz, 40mVrms
discharging the capacitor.
GDM-357
Continuity and Diodes
Resistance≤10Ω, the buzzer sounds;
＞10Ω, the buzzer doesn't
necessarily sound;
Display approximate resistance
value, unit: Ω.