Iso-Tech IDM 203 RMS Instruction Manual page 13

6. A Input Terminal — Input for ampere measurement. The meter can measure currents of up to 20A but the time is then limited
to a maximum of 30 seconds.
7. Function button (blue) — This button is used to switch between a.c. and d.c., between resistance measurement and
continuity testing, and between frequency and ADP measurement.
8. MIN/MAX button — Pressing the MIN/MAX button selects the MIN/MAX store mode. The minimum and maximum values are
then reset to the level currently measured. The display annunciators
mode the minimum or maximum values are stored. A signal tone sounds if a new minimum or maximum value overruns the
display capacity of 4000 units.
By pressing the "Hold" button in the MIN/MAX mode you can stop the maximum/minimum values from being recorded and
then, by pressing it again, you can allow the recording to continue. If you stop the recording, the current measurement shown
is held and the bargraph display frozen.
In the MIN/MAX mode, the minimum or maximum value is shown on the digital display while the bargraph display continues
to show the normal measurements.
9. Relative button (REL) — Pressing the "REL" button causes REL to appear on the display and activates the relative mode.
When you do this, the value shown on the display is stored as a reference value and the display is reset to zero. To exit the
relative mode, hold the "REL" button pressed for two seconds.
In the relative mode, the value displayed is the difference between the reference value held in store and the value currently
measured, e.g. if the reference value is 0.04 Ω and the value currently measured is 15.05 Ω, what is shown on the display is
15.01 Ω.
10. HOLD button — Except in the MIN/MAX mode, this button is used to switch the data hold mode on and off. When the hold
mode is on, appears on the display and the measurement shown is held until the hold button is pressed again. An audio
signal is given when the hold mode is switched to.
If the MIN.MAX button is pressed while the hold mode is on, the meter exits the hold mode and goes over to the MIN/MAX mode.
If the hold button is pressed while the MIN/MAX mode is on, storage of the minimum or maximum values is stopped, and it
resumes again if the hold button is pressed for a second time.
and "MAX" or "MIN" are activated. In the MIN/MAX
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