GW Instek GDM-8245 - Manual (Page 7)

DUAL DISPLAY DIGITAL MULTIMETER
USER MANUAL
10
10. CONTINUITY BEEPER
Description Built in buzzer sounds if conductance is less than 5 ohm.
Open Voltage 3 volts maximum.
Protection 450V dc or peak ac continuous.
11. ENVIRONMENTAL
Operation
Environment
Indoor use, altitude up to 2000m.
Ambient Temperature 0℃ to 50℃.
Relative Humidity 75% (Maximum).
Installation category II
Pollution Degree 2
Storage temperature -40℃ to 70℃.
Relative Humidity
Up to 75%, 0℃ to 35℃, Up to 50%, 35℃ to 50℃, except
the ranges of 2MΩ and 20MΩ which are up to 75% , 0℃
to 35℃.
12. GENERAL
Maximum Common
Mode Voltage 500V dc or peak ac ( low terminal potential with
respect to power line ground ).
Warm Up 0.5 hours to achieve rated accuracy.
Power source AC 100V/120V/230V±15%, 50/60Hz, 8.0VA, 6.0W.
Accessories
Test Lead × 1
Instruction manual × 1
Dimension 251(W)×91(H)×291(D) m/m
Weigh Approx. 2.6 kg
WARNING：To avoid electrical shock, the power cord
protective grounding conductor must be connected to
ground.
CAUTION：To avoid damaging the instrument, do not use
it in a place where ambient temperature exceeds 50℃ .
DUAL DISPLAY DIGITAL MULTIMETER
USER MANUAL
11
4. OPERATION INSTRUCTIONS
4-1 Front panel and rear panel
The front panel, shown in Figure4-1, contains three main elements:
the input terminals, the primary and secondary displays, and the push
buttons.
The rear panel, shown in Figure 4-2, contains the AC power-line
connector, and fuse & line voltage selector, and input fuse holder.
4-2 The [SHIFT] key and function keys
[SHIFT] button is used to enable the secondary function of certain
function keys that with blue symbols printed above. The SHIFT LED
will be on after pressed the [SHIFT] button. At this time, only the
buttons with blue symbols are workable. To release SHIFT function,
press [SHIFT] again. For example, to select DCmV function, press
[SHIFT], then press [DCV] ([DCmV]).
4-3 Warm up
The instrument requires half-an-hour warm up to achieve rated
accuracy.
4-4 Over-range indication
An input is over-range if it exceeds the full scale of the selected range.
GDM-8245 indicates an input is over-range by lighting the “—OL—”
pattern on display.
4-5 No specification indication
On AC+Hz measured mode, when an input is less sensitivity, the
secondary display show “————”. When the frequency of an input
exceeds 51kHz, the primary display will show “————”.