GW Instek GDM-8246 User Manual User Manual

Page 11

DUAL DISPLAY DIGITAL MULTIMETER

USER MANUAL

For example, if [dBm] is pressed when measuring voltage in the max

mode, the maximum value is converted to dBm. To release the dBm

function, press [dBm] again. The dBm mode, AC+Hz mode and

Compare are not selected concurrently.

The reference impedance can be set to any of 21 reference

impedances listed in the Table 5-1 according to the steps as follows:

1) Press [SHIFT] [SET] in sequence into SET mode.

2) Press [REF Ω] to reference impedance selection . The value

displayed on the primary display is the current setting value.

3) Select the required impedance by using [▼] and [▲], then press

[ENTER] to save the data, or press [SHIFT] to cancel the setting.

Table 5-1

8000 300 93
1200 250 75
1000 150 50

900 135 16
800 125 8
600 124 4
500 110 2

5-6. AC+Hz measurements

The function can be selected only when ac range is selected. Press

[SHIFT], then press [AC+Hz], the secondary display shows the

frequency of the input signal that is higher than the sensitivity. The

frequency measurement does not depend on the max/min, rel, or hold

mode. In this mode, the reading rate of the DMM may be slower than

the normal state.

To release the AC+Hz function, press [AC+Hz] again. The dBm mode

and AC+Hz mode and Compare are not selected concurrently.

DUAL DISPLAY DIGITAL MULTIMETER

USER MANUAL

5-7. AC+DC measurements

The function can be selected only when voltage or current function is

selected. Press [AC+DC] button, the primary display shows the true

rms value of the input signal including the ac component and dc

component. In this mode, the reading rate of the DMM is slower than

the normal state.

To release the AC+DC function, press other function (voltage ac or dc,

current ac or dc, R,C, Continuity Beeper, Diode Test) key.

5-8. MAX/MIN measurements

The MAX/MIN mode causes the DMM to hold the lowest and highest

readings. Press [MAX/MIN] button to the MAX mode. The highest

will be displayed in continuous input. In the MAX mode, press

[MAX/MIN] button to the MIN mode. The lowest will be displayed in

continuous input. In the MIN mode, press [MAX/MIN] button to

release the MAX/MIN mode.

5-9. REL measurements

When the [REL] button is pressed, the meter stores the present reading

and displays subsequent measurements as the difference between the

measured value and the stored reading.

In the MAX/MIN mode, set [REL] button to the REL mode. The

maximum or minimum reading will become the relative base.