GW Instek GDM-8245 User Manual

Page 10

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 and AC+Hz mode are

not selected concurrently.

The standard reference impedance of the instrument is 600Ω.

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 are not selected concurrently.

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.

DUAL DISPLAY DIGITAL MULTIMETER

USER MANUAL

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.

5-10. HOLD measurements

The HOLD mode that allows you to keep your eyes fixing on the

probes when taking measurements in difficult or hazardous

circumstances, then read the display when it is convenient and safe.

Press the [HOLD] button the last reading is held on the display in all

function. To release the HOLD function, press [HOLD] again.