GW Instek GDS-122 User Manual - Manual (Page 48)

Faq
95
F
AQ
Power Q • The GDS‐122 does not power up.
• The GDS‐122 stopped working after a short
period of time.
A The battery may need recharging. Connect the
GDS‐122 to the AC adaptor and recharge it for
at least 15 minutes. Then try powering up.
ERR mode in the
multimeter
Q In the multimeter mode, the measurement
type at the top of the display says “ERR”
which looks like an error message.
A The “ERR” sign appears when none of the
measurement switch is pressed. Select one
from the V, A, or R switch and press it.
Q The measured voltage is 10 times smaller than
the real value.
Amplitude
mismatch in the
oscilloscope
A The attenuation ratio on the probe is set at x10.
If you switch it to x1, make sure that the input
voltage does not surpass the maximum 400V.
Q The measured voltage is 10/100/1000 times
larger than the real value.
A The probe ratio in the CH1 or CH2 setup
menu is set at X10, X100, or X1000. See page
211H
22
for details.
Q The waveform appears in the display but is
not stable.
Unstable
waveform in the
oscilloscope
A Configuring the trigger might help you. See
page
212H
30 for details.
• Make sure the trigger source channel
matches the input signal.
• Make sure the correct trigger type, edge or
GDS-122 User Manual
96
video, is selected.
• Try changing the HF and LF repression in
the trigger coupling mode and filtering out
high or low frequency noise.
No waveform in
the oscilloscope
Q The waveform does not appear at all in the
display.
A • The trigger level might be out of the
waveform range. Press the AUTOSET key
so that the GDS‐122 automatically adjusts
the trigger level.
• If the trigger mode is Single, press the
RUN/STOP key to trigger the waveform or
switch the trigger mode to Normal. See
page
213H
30 for trigger details.
Slow update in
the multimeter
Q It takes 30 to 40 seconds for the multimeter to
update the capacitor measurement.
A It takes longer time to measure small
capacitors. 30 to 40 seconds are normal for
measuring 5nF or smaller capacitors. See
page
214H
93 for capacitance measurement details.
Slow update in
the oscilloscope
Q The display response to the waveform change
is unusually slow.
A Slow response is normal in the following
cases.
• Average sampling mode is being selected
(page
215H
22)
• Display persistence is being selected
(page
216H
36)